Solar Panel Cost in Idaho 2026

Idaho is the hardest state in this series to give a single answer for, and the reason is printed at the top of the electric bill. The panels cost roughly the same everywhere in the state. The sun is strong everywhere in the state. The power is cheap everywhere in the state. But the price a utility pays for power sent back to the grid changes completely when you cross from one service territory into another — and in Idaho that crossing can happen between two streets in the same town. A homeowner in Boise and a homeowner in Coeur d’Alene buy the same panels, pay nearly the same price per watt, and watch them produce nearly the same electricity. One of them waits close to three decades to break even. The other waits under two.

That split is the whole guide. Everything else — the cost per watt, the system sizes, the tax deduction, the snow on the roof — matters, but none of it moves the answer as much as the utility does. Idaho Power, which bills about 63% of Idaho homes, stopped netting kilowatt-hours across the month on January 1, 2024. Since then it has paid for exported power the instant it flows out, at an avoided-cost rate that sits near 3 cents for most hours of the year. Avista, which bills the northern panhandle, still does the old deal: a kilowatt-hour sent out in July cancels a kilowatt-hour bought in December, one for one. Rocky Mountain Power, in the east, pays in dollars at avoided-cost rates of its own, and the co-ops write their own rules entirely. There is no statewide net-metering law to fall back on. Your utility’s tariff is the law for your roof.

For the national numbers first, see our solar panel cost guide before weighing Idaho’s figures against them.

How Much Do Solar Panels Cost in Idaho in 2026?

Two anchors describe the Idaho market in 2026, and they land within a cent of each other. EnergySage’s November 2026 state page — drawn from live marketplace quotes — puts the state average at $2.95 per watt installed. At the 12.04 kW average system size, that comes to about $35,561 before incentives, with most quotes landing between $30,227 and $40,895. EcoGen’s September 2026 Solar Cost Index puts Idaho at $2.96 per watt, and its typical 7.44 kW system comes to about $22,022 in cash. That 7.44 kW figure is a measured median — Berkeley Lab’s 2025 median for Idaho, taken from 307 installed systems statewide — and not a model. A third snapshot lands a little higher: SolarReviews’ November 2026 cost page puts Idaho at $3.08 per watt, with a 6.3 kW average system at $20,553.

Taken together, the anchors place Idaho just above the national average of $2.89 a watt, and 33rd lowest of all 51 jurisdictions in EcoGen’s index — a middle-of-the-pack price in a state with bottom-of-the-pack power rates. The neighbors split around it: Montana runs $2.73 a watt, Oregon $2.77, Utah $3.01, and Wyoming $3.14. Identical panels, an identical inverter, and an identical crew would run roughly $1,700 more on a Boise roof than on a Billings roof for the same 7.44 kW system — and hardware is not the reason. Idaho’s installer field is thin: EnergySage lists only two companies on its Idaho marketplace, and much of the state is served by a handful of local firms. A thin bench means less price competition, and less competition shows up in the per-watt number.

Almost the whole distance between the two headline totals is system size, not price per watt — the sources just start from different-sized arrays. That 12.04 kW figure is a marketplace-quote average from EnergySage, pulled upward by very large systems on very large, heavy-use homes. EcoGen’s 7.44 kW is the size the typical Idaho home actually had installed. A 12.04 kW system would make about 18,132 kilowatt-hours a year — roughly 167% of what the average Idaho home uses — which is why the export rules matter so much here: on Idaho Power, most of that extra production would be sold at about 3 cents a kilowatt-hour.

That per-watt number has to cover the whole installed job — panels, inverter or microinverters, racking, wiring, labor, permits, inspection, and interconnection. A new roof, a panel upgrade, tree work, snow guards, and a battery are all extra, and in the northern panhandle the snow detailing a mountain roof needs is usually extra too. Every one of those extras appears as a separate line on the quote, and this guide puts a number on each where it arises. One incentive does sit inside the arithmetic, and it is small enough to be easy to overstate: Idaho’s income-tax deduction (see the incentives section below) is worth about $1,056 in total on the typical system, spread over four years — not the $18,212 that a careless quote might imply by treating a deduction as a rebate. No federal credit sits inside the price either, because there is none to put there for a 2026 owner purchase.

A word of caution before the tables: the lowest quote in Idaho is not always the cheapest system overall. A big share of any installer’s total is overhead and margin, and loan quotes often bury dealer fees of 10-30% of the cash price — sometimes more — inside the amount financed. When bidders are compared side by side, only one figure lines up cleanly: cash price per watt for the same equipment on the same roof. Collect that figure in writing from at least three installers, and walk away from any bidder who refuses to show it. In a thin market like Idaho’s, that third quote is harder to get — and more important for exactly that reason.

Two entries in that table call for a footnote, not a headline. SolarReviews’ cost page shows the same $3.08 per watt but still carries a $14,387 “after tax credit” column — that is the dead 30% federal credit, and the after-credit column is stale and must not be used. RenewEstimator’s 16.5-year payback and ConsumerAffairs’ 11.9-year payback (on a $39,351 typical install at $3.02 a watt, with $36,949 in 25-year savings) are both modeled estimates that price exported power at or near the retail rate; neither models Idaho Power’s real-time net billing, so neither is a verified Idaho payback, and both are flagged here rather than headlined. The GreenWatt figure of $2.80 a watt rests on EIA 2024 rates and NREL Q1 2024 benchmarks — older inputs, useful only as corroboration.

Solar Panel Cost in Idaho by System Size

Size is the first decision, and in Idaho the export rules reward you for getting it right — more than in almost any other state in this series. The average Idaho home uses about 906 kilowatt-hours a month, or roughly 10,875 a year — a 12-month average derived from EIA billing data, with August running higher at about 1,026 kilowatt-hours. One kilowatt of panels here yields about 1,506 kilowatt-hours a year, so a 7.44 kW array yields about 11,205 kilowatt-hours — roughly 103% of the average home’s yearly use. That is why 7.44 kW counts as the state typical size. It serves the whole house without sending the grid power that earns three cents.

Going bigger than the house uses is a worse deal in Idaho than in a state with full retail net metering, because Idaho Power pays for exports the instant they flow, at avoided cost. On an Idaho Power bill there is no monthly banking at all: a kilowatt-hour sent out at noon earns 3.39 cents in summer and 2.90 cents the rest of the year, while a kilowatt-hour used at home saves the full retail price of around 11-13 cents. That gap is why the table below turns unattractive past 8 kW for most Idaho homes on Idaho Power. The table prices every size from the EcoGen anchor of $2.96 a watt, with output of 1,506 kilowatt-hours per installed kilowatt each year. It also shows what share of average home use each size covers, so the point where the array stops serving the house and starts exporting is visible at a glance.

Spend an extra moment on two rows of that table. First, the 12.04 kW state-average array generates roughly 167% of an average home’s yearly use — the average buyer is a household with an electric vehicle, a heat pump, electric heat, or all-electric everything, plus the oversizing that a quote average rarely talks anyone out of. For a gas-heated home with no EV, 7-8 kW is usually enough — not 12. Second, the 7.44 kW typical system already covers about 103% of average annual use — so on Avista, where exported kilowatt-hours bank one-for-one against later use, the typical system is close to the sweet spot, while on Idaho Power the same system already sells a meaningful slice at 3 cents. The sizing conversation starts with the utility’s export rule, then the bills, and only then the roof.

Size the array from twelve months of electric bills, not from however much roof is empty. Total the kilowatt-hours, divide by roughly 1,506 to find the size that covers them, then adjust: add 1-2 kW for a planned EV, more for a heat pump or electric heat, less for a shaded or north-facing roof — then check the result against your utility’s system cap, 25 kW on Idaho Power and Rocky Mountain Power and 100 kW on Avista. If you plan to add an EV or a heat pump, add the load first and design the solar second, or the new load arrives after the array is already sized for the smaller house. For the country at large, that sizing logic is walked through in full in our 6 kW vs 8 kW vs 10 kW guide.

Solar Panel Cost by City: Boise, Nampa, Pocatello & Meridian

Idaho is a spread-out state with one big solar market in the Treasure Valley and smaller ones scattered across the east and the panhandle, and the verified figures run from $3.10 to $3.29 a watt — wider than Oklahoma’s spread. What sets them apart is not just the install price but the utility behind the meter — and in the panhandle that gap is the widest in the state. EnergySage’s city pages for November 2026 show the Treasure Valley spread most clearly, and the pattern is worth reading carefully: Boise, the biggest market in the state, is also the most expensive of the verified cities.

Boise is the biggest market in the state, served by Idaho Power, at $3.29 a watt — the highest of the verified cities — with a 13.42 kW average system at about $44,159. That is about 11% above the statewide $2.95 a watt — Boise’s quotes run higher even though Boise is where the installers are. A thin installer bench concentrated in one metro does not always mean cheaper prices, and Boise’s numbers are the proof. Nampa, about 20 miles west in the same utility territory, runs $3.16 a watt on a smaller 11.57 kW average system at about $36,598. Pocatello, in the east on Idaho Power as well, runs $3.10 a watt on an 11.44 kW average system at about $35,416 — the cheapest of the three verified EnergySage cities, and still above the state average.

Meridian and Coeur d’Alene carry a warning label rather than a verified price. Both show $3.06 a watt on a single planning-estimate source, with identical figures and identical size tables across the two cities — the signature of a templated estimate, not a measured market — and the same source still subtracts a stale 30% federal credit in its “after incentives” column. Treat $3.06 as indicative only, and do not quote it as an EnergySage figure, because it is not one. Idaho Falls shows $3.32 a watt on an older April 2026 source with an older methodology; it is included here as corroboration that eastern Idaho runs at least as expensive as Boise, not as a verified current price. No verified EnergySage city figures were pulled in this pass for Meridian, Idaho Falls, Twin Falls, Caldwell, Rexburg, or Post Falls, and this guide does not invent them.

Rank the cities on price per watt, never the total. Boise’s $44,159 looks alarming next to Pocatello’s $35,416, but most of the gap is system size — 13.42 kW against 11.44 kW — not price. And use the utility column before the price column: Coeur d’Alene’s $3.06 planning estimate sits in Avista territory, where exported power banks one-for-one at retail, while Boise’s $3.29 sits in Idaho Power territory, where most exports earn 3 cents. A Coeur d’Alene system that costs slightly less per watt and earns three to four times as much for its exports is not a close call. The payback section below does that work for each utility.

One more city-level note: the installers named on EnergySage’s Idaho pages in October 2026 are Intermountain Wind & Solar and Idahome Energy of Boise, and EcoGen’s October 2026 company ratings add Big Dog Solar of Chubbuck and Meridian — in solar since 2008, with a Meridian office at 1190 W Taylor — and EGT Solar (EvenGreen Technology). A thin installer bench is part of why Idaho prices stay above the national average — get three quotes, and make at least one from a company that already works in your utility’s territory. One caution from EcoGen’s company check: it notes nine disciplinary actions by Idaho’s Division of Occupational and Professional Licenses on Big Dog Solar’s electrical license. That does not settle whether to hire the company — verify any installer’s license standing yourself, on the DOPL registry, before you sign.

Idaho’s Sun: Production, Cold & Snow

Idaho’s sunshine arrives with a climate that flatters the equipment in one season and tests it in the other, and a production estimate that is honest has to carry both halves of the story.

The sun. One kilowatt of panels in Idaho yields roughly 1,506 kilowatt-hours a year on EcoGen’s PVWatts-based figures, and a 7.44 kW array yields about 11,205 kilowatt-hours — about 103% of the average home’s yearly use. Cross-checks land close: HomeSolarAtlas gives a standardized benchmark of 1,360 kilowatt-hours per kilowatt a year, and a Boise PVGIS model gives about 1,474. Take 1,360-1,506 as the working range, anchored on EcoGen’s 1,506. Peak sun hours run about 5.35 a day on the annual average in Boise-class light, and the state averages close to 4.92 a day overall, with Twin Falls and Boise seeing 5.0 to 5.48 kilowatt-hours per square meter per day on an optimally tilted surface. Boise gets about 210 sunny days a year. June and July are the best months; December is the worst, with barely 9 hours of daylight against more than 15 in June.

Cold is a genuine advantage. For every degree Celsius a panel cell warms beyond 25 degrees, it loses roughly 0.3-0.5% of its efficiency. An Idaho rooftop in January runs far cooler than 25 degrees, so a system here generates more per hour of sunshine in winter than the same panels would on a hot roof in the South. Cold, clear, high-altitude air is some of the best solar weather there is, and it is a large part of why Idaho’s per-kilowatt production holds up against sunnier states. The same physics cuts the other way in July, when a Boise rooftop bakes — but the long summer days more than compensate over the year, which is why the annual figure still lands near 1,506 kilowatt-hours per kilowatt.

Snow is the variable, and it splits the state in two. Boise averages about 18-20 inches of snow a year — 19 inches on the 1991-2020 normals, with December the snowiest month at about 7 inches — and most of it falls between December and February, with frequent melt-offs, since daytime temperatures often rise above freezing even in midwinter. A tilted array sheds most of that snow within a day or two of a storm, and a south-facing tilt does the shedding for free. Northern Idaho and the mountains get far more snow than the Treasure Valley, and a low-slope roof anywhere in the state holds snow longer than a steep one. No Idaho-specific snow-loss percentage was verified for this guide, so none is stated here — if an installer shows you a production estimate, ask to see the snow-loss assumption inside it, and ask what tilt it assumes. Snow guards, which keep sliding snow off walkways and gutters, are a line item on mountain roofs, not a footnote.

Idaho’s production curve rises and falls sharply with the seasons — a cliff between summer and winter, not a slow slope. Summer days are long and the panels run hard; winter days are short and the panels run little — and that is exactly when Idaho Power pays the lowest export price, 2.90 cents for every hour from October through May. Winter production is worth the least precisely when the house needs the most heat, which is why a battery or a heat pump paired with solar needs its own arithmetic in Idaho rather than a borrowed one from a southern state. This guide pulled no verified Idaho monthly PVWatts table, so the seasonal shape is described in words here rather than month by month — if an installer shows you one, ask to see the PVWatts run behind it.

Wildfire smoke trims summer output in bad fire years. Idaho’s fire seasons put smoke over the Treasure Valley and the panhandle for days or weeks at a time, and smoke cuts the sunlight reaching the panels. It is a real Idaho variable, and an unpredictable one — no verified percentage is stated here.

The roof itself, and the snow it carries. A rooftop array in Idaho sits under a snow load the racking and the roof must carry together — confirm the roof’s snow-load rating and the racking’s uplift rating before signing, and let the building department’s figure govern, not the installer’s guess. If the roof has less than ten years of life in it, replace it first — removing panels and reinstalling them for a later reroof costs thousands by itself. The reroof figures live in our roof replacement guide. Standing-seam metal counts among the best solar roofs anywhere, because clamps grip the seams without a single roof penetration, and a metal roof sheds snow faster than asphalt does. Hail is not the defining Idaho risk the way it is on the southern plains — no Idaho hail statistics were pulled for this guide, and the Hail Alley numbers from other states do not belong here — but panels rated UL 61730 / IEC 61730 remain the specification to ask for, and homeowners insurance remains the cover for storm damage.

Working with the climate. No exotic gear is needed. Pick a south-facing orientation where the roof allows it, a tilt steep enough to shed snow and catch the low winter sun, microinverters or optimizers so a shaded string cannot drag the whole array down, and a production estimate built on PVWatts data with the snow assumption out in the open, not hidden. On Idaho Power, the most valuable kilowatt-hours are the ones the house eats the moment they are made — and a west-facing tilt that pushes more production into the 3-to-11 p.m. summer window, when exports earn 15.68 cents, is worth discussing with the installer even if it gives up a little total annual output.

Net Metering in Idaho: The Rules That Decide Your Return

Idaho has no statewide net-metering law — anyone who says otherwise is describing a rule that does not exist here. What Idaho has instead is three different utility rulebooks plus a co-op free-for-all, and the difference between those rulebooks is the difference between a 19-year payback and a 31-year one. Find your utility first. Everything else in this section follows from that name.

Idaho Power — about 63% of Idaho homes, roughly 555,000 customers, Boise plus much of southern Idaho. Idaho Power’s tariff is called Schedule 6, Residential Service On-Site Generation. Since January 1, 2024, under IPUC Order 36048, new systems have been on real-time net billing: the meter compares what flows in and out as it happens, hour by hour, and there is no netting across the month at all. Power you use the moment it is made offsets the retail rate — about 12.12 cents a kilowatt-hour in summer and 9.93 cents the rest of the year for the first 800 kilowatt-hours a month, before other bill adjustments, on top of a $15-a-month service charge. Power you send out earns the Export Credit Rate, and the rate depends on the season and the hour: 15.6836 cents a kilowatt-hour on summer on-peak hours, 3 p.m. to 11 p.m., Monday through Saturday, June 1 through September 30, except holidays; 3.3920 cents at all other summer hours; and 2.9019 cents for every hour from October 1 through May 31. Those rates took effect January 1, 2026, under IPUC Order 36892, and they stay until Idaho Power files again — a filing is due April 1, 2028, and the commission has suspended annual updates until then. Credits are dollars on the bill, they carry forward, and they do not expire; they are paid out only if you move without starting new service. The system may be no larger than 25 kW, a battery does not count toward that limit, and the interconnection application costs $100. One more thing the high summer-evening price hides: it starts at 3 p.m., after the hours when panels make the most power. A quote that values all your exports at one blended price is wrong for Idaho Power — ask the installer to show exports by season and by hour.

The rate did not arrive gently. The commission’s Order 36785 of September 30, 2025, cut the export rate by about 31%, after Idaho Power had proposed a 60% cut that April — and that followed a January 2024 cut from an average of 8.8 cents to 6.18 cents. The direction of travel is plain, and the 2028 filing is the next moment it can change. A homeowner who bought panels in 2023 on the old monthly netting keeps it only if the system was connected by December 20, 2019 — those legacy systems keep one-for-one monthly kilowatt-hour credits until December 2045, and the status passes to the next owner of the home. Lose it by leaving the system offline for more than six months or moving it to another site, and it is gone.

Rocky Mountain Power — about 9% of Idaho homes, roughly 77,000 customers, eastern Idaho. Rocky Mountain Power runs Schedule 136, Net Billing Service, and it pays in dollars at avoided-cost rates of its own, effective December 1, 2025: June through October, 14.666 cents a kilowatt-hour on-peak (3-11 p.m.) and 3.664 cents off-peak; November through May, 5.597 cents on-peak (6-9 a.m. and 6-11 p.m.) and 1.228 cents off-peak. Unused credits carry to the next bill. The system may be no larger than 25 kW, the homeowner must own it, and the application costs $85. Its older net-metering plan closed to new applicants on October 2, 2020, and customers already on it keep monthly kilowatt-hour netting until October 2, 2045. Rocky Mountain Power is also the only Idaho utility that pays anything for a battery — see the battery section below — but its export prices are no kinder than Idaho Power’s for most hours of the year.

Avista — about 15% of Idaho homes, roughly 132,000 customers, northern Idaho including Coeur d’Alene and Post Falls. Avista still does the old deal, and it is the best deal in the state. Under Schedule 63, its net-metering rule, extra solar power credits kilowatt-hour for kilowatt-hour against later bills — 100 extra kilowatt-hours in July can cover 100 kilowatt-hours taken from the grid in December. The system may be up to 100 kW, and the homeowner must own it. Two catches come with it. First, the yearly reset on March 31: credits still unused on March 31 each year go to Avista, and you are not paid for them — a big summer surplus that is not used by then is a gift to the utility. Second, the rule carries a 1.52 MW program limit, first come, first served — and federal data already shows net-metered solar at Avista in Idaho at 5.426 MW in 2024, well above that limit. Avista seems to have kept signing up systems, but no Avista statement confirming that was found in this pass. Before you sign, ask Avista in writing whether Schedule 63 still takes new systems. Avista’s residential rate itself is tiered: Schedule 1, effective October 1, 2026, charges a $20 basic charge, 11.424 cents a kilowatt-hour for the first 600 kilowatt-hours, and 12.712 cents above that, all-in.

The co-ops and city utilities write their own rules, and the commission does not set them. Kootenai Electric Cooperative, in northern Idaho, banks exported power kilowatt-hour for kilowatt-hour, and its banked credits do not expire — but it charges net-metering homes a $32.50-a-month service charge and a $0.00971-per-kilowatt-hour loss charge on exported power, adjusts banked credits every April for the change in its own cost of energy, and never pays credits out; if you move, they stay with the home. Idaho Falls Power, the municipal utility in Idaho Falls, and the smaller co-ops have terms of their own that were not verified in this pass. Before signing, co-op and municipal customers need the solar rate sheet in writing — no IPUC order covers those utilities, so the paper is the only protection.

Payback: How Long Until Idaho Solar Pays for Itself?

Payback is where an Idaho system either earns its keep or does not, and the answer turns on which utility sends the bill — more sharply than in any other state in this series. The worked examples below are built on the EcoGen anchors, so each input can be checked, with EnergySage as the cross-check — and this guide flags every place the two part ways.

A worked example. Take a typical 7.44 kW system at $2.96 a watt, priced at $22,022 before incentives. Annual output comes to about 11,205 kilowatt-hours. The state deduction is worth about $1,056 spread over four years at Idaho’s flat 5.8% income tax rate, so the net cost after that small help is about $20,966 — but the payback figures below are stated before incentives, as EcoGen publishes them, so the arithmetic stays comparable across utilities.

Idaho Power is the longest payback on a major utility in this series. EcoGen’s per-utility worked example for Idaho Power territory puts the year-one value at about $794 a year, using Idaho Power’s 12-month average price of 13.01 cents less the $15-a-month service charge — which leaves 11.30 cents for each kilowatt-hour used at home — and an export credit averaging 4.27 cents, the commission’s average of the Schedule 6 credits. The model assumes 40% of the solar power is used at home as it is made: 11,205 kilowatt-hours times 40% times 11.302 cents is $507 a year of self-use value, and 11,205 times 60% times 4.27 cents is $287 a year of export value. Simple payback is $22,022 divided by $794, about 27.7 years — call it about 28 — before incentives, counting no upkeep, no rate rises, and no financing. With every export at the lowest 2.9019-cent credit it stretches to 31.4 years, so EcoGen prints the range as 27.7 to 31.4 years. That is longer than the 25-year panel performance warranty. Say it plainly: on Idaho Power, the typical owned system does not pay for itself inside the warranty period.

Avista is the shortest payback in the state, by a wide margin. EcoGen puts it at about 18.8 years for the same 7.44 kW system — roughly nine years faster than Idaho Power — because Avista still nets kilowatt-hours one-for-one at retail, so nearly every kilowatt-hour the panels make is worth the full retail price instead of 3 cents. The figure is conditional on Avista confirming the household can enroll in Schedule 63, and on the March 31 reset not swallowing the summer surplus. No Avista worked arithmetic was pulled in this pass, so none is re-derived here; the 18.8-year figure is EcoGen’s published number, dated October 30, 2026.

Rocky Mountain Power is the longest of all. EcoGen puts it at 29.1 to 39.6 years — the worst payback in the state, and the worst in this series. No worked arithmetic was pulled in this pass, so it is presented as a range only. The direction is clear enough: eastern Idaho’s export prices are low in most hours, its winter on-peak price of 5.597 cents is no rescue, and its retail rate is not high enough to carry the system.

Idaho’s statewide payback lands between those two utility figures. EcoGen puts it at about 25.7 years, weighted by the homes each utility serves, before incentives, with no upkeep and no future price rises counted. It is the honest statewide line, and it is a sobering one: a typical Idaho system takes about as long to pay back as the panels are warranted to perform.

The flagged conflict. RenewEstimator reports a 16.5-year payback and ConsumerAffairs reports 11.9 years with $36,949 in 25-year savings. Both are modeled estimates that price exported power at or near the retail rate, and neither models Idaho Power’s real-time net billing. Do not present either as a verified Idaho payback, and do not let a quote cite one for an Idaho Power or Rocky Mountain Power home. The gap between 11.9 years and 27.7 years is not a rounding difference — it is the export rate, and any payback that ignores it is modeling a different state.

What moves the payback most. Daytime self-use is the biggest lever, and in Idaho it matters more than anywhere else in this series. Shifting the dishwasher, the laundry, and the EV charger into daylight hours moves kilowatt-hours out of the 3-cent export bucket and into the 11-to-13-cent self-use bucket, and no other change pays as well — EcoGen’s own model assumes only 40% self-use, so a household that pushes that share toward 60% or 70% shortens its payback materially. A west-facing tilt is the second lever on Idaho Power, because it pushes more production into the 3-to-11 p.m. summer window when exports earn 15.68 cents instead of 3.39. Rate escalation is the third lever: Idaho rates are growing about 3.1% a year per EcoGen — but at roughly 3% a year, 25-year savings grow only slowly, and no Idaho Power system pays back quickly on flat rates alone given 13-cent power and 3-cent exports. Fourth comes financing: a solar loan carrying dealer fees can lift the effective price by 10-30%, so judge quotes on cash price per watt rather than the monthly payment. And the deduction barely moves the needle: about $1,056 over four years takes roughly 1.3 years off the Idaho Power payback at $794 a year.

Who still comes out ahead. Four kinds of Idaho household clear it. The Avista customer, where the published payback is about 19 years and every exported kilowatt-hour still banks at retail. The all-day home with a big daytime load — home offices, daytime laundry and dishwashing, an EV charged at midday — that keeps most of its production at full retail value under real-time billing. The household pairing solar with a heat pump or an EV, sizing to the new daytime load and staying under the 25 kW utility cap. And the backup-power buyer, who buys mainly for outage protection through winter storms and wildfire-season shutoffs, with savings second — in that case the payback math is context, not verdict. Walk away when your home sits empty on weekdays on Idaho Power, when you live in Rocky Mountain Power territory and are counting on a quick return, or when the installer projects savings without naming your utility’s export prices.

Idaho Incentives in 2026: A Deduction, a Loan, and Little Else

Once the federal credit is gone, most states still keep something in reserve: a state credit, a rebate, an exemption. Idaho keeps a deduction and a loan, and the deduction is smaller than it looks. The incentives picture in Idaho is no bigger than that. It is worth saying plainly, because most solar advertising in Idaho skips it.

Idaho has a state income-tax deduction, not a credit — and the difference is worth about $17,000. A credit cuts the tax you owe, dollar for dollar. A deduction cuts the income Idaho taxes, and what you save is the deduction multiplied by your own Idaho tax rate. The law is Idaho Code 63-3022C: in the year the system is switched on, you deduct 40% of what you paid for it, and in each of the next three years you deduct 20%. The deduction cannot be more than $5,000 in any one year, which makes the most you can deduct $20,000 over four years. There is no end date in the law. On the typical $22,022 system, 40% is $8,809 — above the yearly limit, so the first-year deduction is $5,000 — and 20% in each of the next three years is $4,404 a year, for a total deduction of $18,212. That is income Idaho does not tax. It is not $18,212 in your pocket. At Idaho’s flat 5.8% individual income tax rate, the four-year saving works out to about $1,056 in total: $290 in year one and about $255 in each of the next three years. A quote that shows the deduction as a dollar saving has picked a tax rate for you — ask which rate, and check it with your tax preparer. A home buyer can use deduction years the seller left unused. The law does not name batteries and does not address leases, so ask a tax preparer first before counting either.

The State Energy Loan is real, and it ends on December 31, 2026. The Governor’s Office of Energy and Mineral Resources, the state energy office, lends up to $40,000 for solar and other home energy projects through a partner lender — 3% interest for 3 years, 5% for 5 years, or 7% for 7 years. It was taking applications when last checked in September-October 2026, first come, first served, until the money runs out or December 31, 2026, whichever comes first. This is a loan, so it lowers the cost of borrowing, not the price of the system. The order matters: the loan must be approved, closed, and funded before installation begins, and there is a $100 credit-analysis fee you do not get back. The loan is secured by real estate, and you close it in person. There is no income limit, and single-family homeowners who pass a credit check can apply. The end date is close — ask the energy office how much money is left before you plan around this loan.

Idaho offers no sales-tax break on solar equipment at the state level. Idaho charges its 6% state sales tax on home solar equipment, with no exemption for it, and a quote that omits sales tax understates the cash price by about $1,321 on the typical $22,022 system. Get sales tax shown as a separate line on the quote.

No residential property-tax exemption was verified. The sources conflict, and the conflict is worth naming. EnergySage states flatly that Idaho offers no sales or property tax exemptions for solar. Today’s Homeowner says property taxes will increase with a solar install. One site cites Idaho Code 63-602LL for a residential exemption — but the code section located in this pass, 63-602JJ, covers commercial producers of wind, solar, or geothermal power, whose property tax is replaced by a 3.5% charge on gross energy earnings. No verified residential exemption exists in this guide. Never assume the added home value escapes taxation — ask the county assessor how a solar array is valued before you sign.

No Idaho utility pays a rebate for panels. Not Idaho Power, not Rocky Mountain Power, not Avista, not any co-op or municipal utility. No Idaho utility sends a rebate check when the panels go in. Any installer promising an Idaho utility rebate is either confused or selling you something else. Rocky Mountain Power’s Wattsmart battery payment — $1,000 or $2,000 once, plus a small yearly credit — is the only utility money in the state, and it is for batteries only; see the battery section below.

Idaho has no Solar for All program open for households. In August 2025 the EPA shut off the Solar for All grants. In September 2026, federal courts ruled that termination unlawful, and the EPA was still weighing an appeal on October 1, 2026. As of October 5, 2026, the multistate grantee Inclusive Prosperity Capital still showed its program as paused, and no household application route was found for Idaho. There is no way for an Idaho household to apply for it.

Federal home energy rebates have not launched in Idaho at all. The state was allocated about $81 million in total — $40,367,910 for HEAR and $40,522,381 for HOMES, per the federal dataset — but Idaho does not appear on the federal launched map, and the Governor’s Office of Energy and Mineral Resources program page says plainly that rebates are not currently available and strongly advises against basing purchasing decisions on the anticipation of receiving a rebate. Some secondary trackers claim Idaho declined the funding outright; that claim was not verified from a primary source in this pass, so this guide states only the verifiable fact — awarded, not launched, not available. Even once it launches, HEAR still will not pay for solar. It funds electrification — heat pumps, heat-pump water heaters, electrical panels, and wiring tied to insulation — and never panels, batteries, EV chargers, or windows.

Federal Help in 2026: $0 Tax Credit — and the Lease Route Is Unclear

The 2026 federal story fits in one paragraph — which is exactly why so much solar advertising still gets it wrong. In Idaho the paragraph has a second half that Oklahoma does not get, because the lease route that saves other states is not established here at all.

A homeowner-owned system installed in 2026 earns no federal tax credit whatsoever. The One Big Beautiful Bill Act — Public Law 119-21, signed July 4, 2025 — took the Residential Clean Energy Credit (§25D, 30%) away from systems placed in service after December 31, 2025. Per IRS fact sheet FS-2025-05, the completion date is what counts: a 2025 deposit buys nothing when the crew finished the job in January 2026. The §25C credit for efficient home improvements closed on that same date. Any 2026 cash or loan quote that still deducts 30% is priced under a law that no longer exists — ask the installer to strip it out and quote again. SolarReviews’ own cost page still shows a $14,387 “after tax credit” column for Idaho — that is the stale 30% figure, and it is excluded from every number in this guide.

Leases and PPAs are not established in Idaho — and no provider was found selling one. A company-owned array can still claim the commercial clean-electricity credit (§48E, 30%), so long as the system enters service by December 31, 2027 and construction started by July 4, 2026, the cutoff IRS Notice 2025-42 sets out. In a state where residential third-party ownership is clearly legal, that credit reaches homeowners through a lease or a power purchase agreement, with the company passing part of the value on as a lower monthly payment. Idaho is not such a state. DSIRE’s third-party PPA map (May 2026) does not list Idaho as authorized, and EcoGen’s market check of October 5, 2026, found no one selling a lease or a PPA to Idaho homes. Two local companies do list leases and PPAs on their websites — Big Dog Solar lists a lease-to-own option and a PPA on its Boise and Pocatello pages, and Idahome Energy lists cash, loan, lease, PPA, and prepaid lease — but a marketing page is not a sale, and EcoGen’s check found no actual offers. EnergySage’s Idaho page shows generic national lease and PPA estimates of $146-$164 a month, labeled as based on U.S. national quote data, with zero installers near the reader offering a rental option. Treat those as national templates unless an Idaho provider is named on the page, in writing, with terms. Have a lawyer read any lease or PPA before signing — Idaho’s Residential Solar Energy System Disclosure Act (Title 48, Chapter 18, 2019) requires written disclosures for solar agreements including leases, and that disclosure document is the place to start.

HEAR money never goes to solar. Income-qualified households can still receive up to $8,000 from the Home Electrification and Appliance Rebates program in 2026 — but that funding is for electrification, not panels. The money under HEAR funds heat pumps, heat-pump water heaters, electrical panels, and insulation-related wiring work. Panels, batteries, EV chargers, and windows all fall outside the program. Since the Energy Department issued Notice 26-2 on September 1, 2026, the program pays only for electric-to-electric upgrades — no fuel-switching. Idaho’s own HOMES and HEAR programs have not launched at all, and the state has set no launch date. Tucking a HEAR rebate into the solar price describes a program that simply does not work that way. HEAR can still matter to an Idaho homeowner. A heat pump paired with new panels is a common combination, and the heat-pump half may qualify once Idaho’s program launches — the solar half never will.

The honest summary is this: in 2026 the federal government contributes nothing to an Idaho homeowner who buys solar panels outright, and — unlike in Oklahoma — it cannot be counted on to contribute indirectly through a lease or a PPA either, because no clear legal route and no verified provider exist for one. On a cash quote, the price is the price. The only state help is a deduction worth about $1,056 over four years and a loan that ends on December 31, 2026. For the full 2026 federal picture, see our federal tax credits guide, and for lease-versus-buy in detail, our national solar cost guide.

Permits & Licensing: What Idaho Requires

Idaho’s licensing picture is unusual in one respect that helps a buyer who knows where to look: the state has a dedicated solar license category, and it is the only category in the rules that names the industry’s leading credential by name.

The electrical work needs a Division of Occupational and Professional Licenses (DOPL) license. The Idaho Electrical Board, inside DOPL, licenses the electrical trade statewide under Idaho Code Title 54, Chapter 10 and the board’s rules at IDAPA 24.39.10. There is a Solar Photovoltaic limited electrical installer category built for exactly this work: 4,000 hours of work experience in the category, plus proof of photovoltaic installer certification by the North American Board of Certified Energy Practitioners (NABCEP) or equivalent. A limited electrical contractor license covers work only inside its own category, and a full electrical contractor must be or employ a licensed master electrician. Every contractor applicant must show $300,000 in liability insurance plus workers’ compensation coverage. Ask for the installer’s DOPL electrical contractor number and verify it on the DOPL registry; the contract company’s name must match. Idaho issues no statewide general contractor license, so a company that waves a general contractor credential instead of an electrical one has shown you the wrong document.

Contractor registration is a second check, not the same one. Idaho requires contractors to register with DOPL — the registration numbers carry an RCE prefix — and the registration is separate from the electrical license. Big Dog Solar, for example, holds electrical contractor license 017916 and contractor registration RCE-36953; Idahome Energy holds registration RCE 65198. Ask for both numbers, check both on the registry, and check that the names match the contract. For solar installers, NABCEP certification is the leading industry credential, and in Idaho it is more than a nice-to-have: it is a named requirement for the solar limited-installer license itself. It is worth asking about even for a crew working under a full electrical contractor license.

Permits and interconnection take time. In Idaho a rooftop system needs a building permit, an electrical permit, and a utility interconnection agreement, in that order — and of the three, interconnection is usually the slowest. This guide verified no Idaho-specific permit fee schedule, so no fee figure is given here. The town or county building department sets it, and the snow-load figure the building department applies is the one that governs the roof. Idaho Power charges a $100 interconnection application fee and Rocky Mountain Power charges $85; no Avista application fee figure was verified for this guide, so none is stated. Do not import the Alabama pattern: Alabama Power charged no study fee up to 25 kW, but that figure belongs to Alabama, not Idaho. No Idaho-specific interconnection timeline was verified either; the national figure, per Palmetto (April 2025), is that residential interconnection usually runs 2-4 weeks, cited here as a national figure only. What slows an Idaho install down is the calendar, not the price tag. Any installer promising permission to operate inside two weeks is promising something the utility decides, not the installer.

Idaho is one of the better states in this series on HOA rights — read the statute, not the surveys. Idaho Code 55-3208, added in 2022 through House Bill 158, says no homeowners association may add, amend, or enforce any covenant, condition, or restriction in a way that prohibits installing solar panels or solar collectors on a rooftop within the association’s jurisdiction. The HOA may determine the specific location on the roof, as long as installation is permitted with an orientation to the south or within 45 degrees east or west of due south, and it may adopt reasonable rules consistent with the building code — panels parallel to the roofline, conforming to the slope of the roof, and frames, support brackets, and visible piping or wiring painted to coordinate with the roofing material. Those rules apply only to rooftops owned, controlled, and maintained by the homeowner. Some 2026 surveys list Idaho among the states with no solar-access law. That is wrong against the primary statute, and it is not used anywhere in this guide. Still get architectural-review approval in writing before ordering panels — the law protects the installation, not the paperwork fight — and for condo owners the hurdle is doubled, because the roof is usually common area and the board’s approval process is the whole decision. Idaho also has a solar disclosure law worth knowing about before signing: the Residential Solar Energy System Disclosure Act (Title 48, Chapter 18, 2019) requires written disclosures for solar agreements, including leases, entered on or after October 1, 2019. Ask for the disclosure document and read it before you sign anything.

What Pushes Your Idaho Quote Up or Down

The per-watt anchor is a starting point, not a quote. Seven factors can move an Idaho quote by thousands of dollars, and three of them come from this state’s climate and power market.

Labor is ordinary in Idaho — and that is itself the point. Idaho electrician pay runs right at the national median — $30.29 an hour against $30.38 nationally, per BLS May 2025 — with 5,690 electricians employed in the state and a 10th-to-90th percentile range of $18.67-$45.90 an hour. Labor is the largest soft-cost component of an install, and in Idaho it neither discounts the job nor inflates it the way coastal wages do. What moves an Idaho quote is not cheap labor but thin competition: with only a handful of installers serving much of the state, the crew’s experience matters more than the headline rate. Ask how many installs the crew has done in your utility’s territory, not just how many years the company has existed. No Idaho-specific BLS figure for solar PV installers turned up — BLS publishes state-level solar-installer wages for only 32 states, and Idaho was not among those located in this pass — so this guide uses the national figure and flags it as national: a median of $53,140 a year, about $26 an hour, with 31,100-31,350 such jobs nationally and BLS projecting 37% growth from 2025 to 2035.

The roof itself, and the snow it must carry. Cold winters and snow loads age Idaho roofs differently from southern ones: freeze-thaw cycles work on flashing and shingles, and a roof that holds snow for weeks carries a load a summer roof never sees. A roof with under a decade left should be replaced before the array goes up, because a detach-and-reset for a later reroof runs into the thousands on its own. See our roof replacement guide for what a reroof costs. Standing-seam metal — common on Idaho mountain homes and newer builds — counts among the best solar roofs anywhere, because clamps grip the seams without a single roof penetration, and a metal roof sheds snow faster than asphalt does. Snow guards, which keep sliding snow off walkways and gutters, are a real line item on a steep mountain roof. Confirm the roof’s snow-load rating with the building department before the panels go up, not after.

Panel tier. Top-tier panels run 10-20% more per watt than value-tier panels. In Idaho that premium buys two things that matter: better low-light performance on cloudy winter days and slower degradation over a quarter century of cold, bright sun. On a tight roof, paying extra for efficiency is worth it. On the open plains of southern Idaho, a big unshaded roof usually favors the cheaper value-tier panels. Premium n-type panels also degrade more slowly — 0.25-0.5% a year, holding 91-93% of rated output at year 25, against the fleet median of about 0.5% a year and about 88% at year 25 per NREL — which matters more in a state where the payback already runs past the warranty, because every extra year of strong output is a year the system needs.

Inverter choice. A string inverter is cheaper upfront. Microinverters or optimizers cost more but generate more on roofs with partial shade — and Idaho roofs, with their pines, dormers, and chimneys, carry shade more often than installers admit, and snow that lingers on one part of an array shades it the same way a tree does. Microinverters also monitor each panel on its own, so a single shaded or snow-covered panel cannot drag the whole string down with it. A string inverter usually lasts 10-15 years, so expect one replacement during the system’s life; microinverters usually carry about 25 years. Our inverter replacement guide costs each type out over its full life — but that guide is national, and its dollar figures are national, not Idaho-specific.

The electrical panel. Many Idaho homes still run on 100-amp service — especially ranch homes and split-levels from the 1960s to the 1980s — and a solar install often forces the question. Per our electrical panel upgrade guide, a 200-amp panel upgrade runs $1,500-$4,000 nationally, and it is the most common surprise add-on in Idaho quotes. Before signing, find out whether the quote covers it — not once the electrician is already in your driveway. No Idaho-specific panel-upgrade dollar figure was verified for this guide, so the national figure stands in, flagged as national. One Idaho wrinkle: a panel upgrade is electrification work, the kind HEAR is designed to pay for — once Idaho’s HEAR program launches, which it has not.

Financing terms. Paying cash gives the best long-term return. A $0-down loan carries dealer fees of 10-30% of the cash price, sometimes over 50%, buried inside the amount financed — the Consumer Financial Protection Bureau’s August 2024 market spotlight is the source, a national figure, but Idaho quotes feel it exactly the same way. The State Energy Loan is the third path in Idaho, and it is a genuinely cheap one — 3% for three years — but it ends December 31, 2026, it must be funded before installation begins, and it is secured by real estate with an in-person closing. A lease or PPA is the fourth path, and it is thin here: no provider was found actually selling one to Idaho homes, and the legal status is unclear, so a lease quote should be read by a lawyer before it is compared on its monthly payment at all. Community solar is the fifth path, and no general community-solar subscription was verified for Idaho homeowners in this guide.

Maintenance and lifespan. Panels keep generating for 25-30 productive years, past the warranty, at lower output. For materials and workmanship, product warranties usually run 10-25 years; performance warranties usually run 25-30 years, guaranteeing 80-92% of rated output at year 25 depending on tier. Maintenance is minimal — occasional cleaning, and an annual production check — because there are no moving parts. In Idaho, snow usually slides off a tilted array on its own; a low-slope roof holds it longer, and a ground-level rinse in spring does what rain does not. Lifespan, degradation, and maintenance figures are national only — no Idaho-specific versions exist — so every figure in this paragraph carries a national flag.

Batteries in Idaho: Worth It?

Of all the add-ons, a battery is the most consequential in an Idaho project. It can add $15,000 or more to the job, and whether that money comes back turns on a question Idaho answers differently from its neighbors.

Battery cost. A 13.5 kWh storage add-on runs about $15,647 installed (EnergySage, July 2026, a national figure; no Idaho-specific battery price was verified for this guide). A battery the owner installs in 2026 gets no federal credit either: §25D covered storage too, and it closed on the same date. Battery model pricing at the national level is in our solar battery cost guide. One Idaho wrinkle national guides skip: batteries lose usable capacity in deep cold — a garage-mounted battery in the northern panhandle needs its temperature rating checked before it is bought.

Only one Idaho battery payment exists, and it is small. Rocky Mountain Power’s Wattsmart program pays $1,000 once for a battery under 10 kW or $2,000 for one over 10 kW, plus $15 per kW a year — up to $100 a year — for four years, then $50 per kW, up to $250 a year, after the term. The payment may be limited to 70% of the battery equipment cost, and leaving the program early means repaying part of it. The amounts changed on July 1, 2026: the payment was $400 per kW before that date, so an older quote can overstate it several times over. Idaho Power pays nothing for a home battery, Avista pays nothing for one, and no state battery incentive exists. The grid pays the battery nothing on Idaho Power. A battery’s earnings are the spread between the export rate and the retail rate on each kilowatt-hour it stores and releases later. On Idaho Power that gap runs roughly 8-10 cents a kilowatt-hour for most hours — real, but narrower than it looks, because the highest-value export hours (summer evenings at 15.68 cents) are exactly the hours a battery would rather be discharging into the house than into the grid. Storing 10 kilowatt-hours each day and releasing them after dark saves roughly $0.80-$1.00 daily, about $300-$365 a year. On a $15,647 battery, that is a return measured in decades, before degradation. That spread between buy and sell prices is genuine, yet by itself it cannot pay for a battery. On Avista it is smaller still, precisely because kilowatt-hour netting already does part of the battery’s job for free — a banked summer kilowatt-hour covers a winter kilowatt-hour without any hardware at all.

Backup is the real case in Idaho. Winter storms take down lines across the state, wildfire season brings public-safety shutoffs in the foothills, and a January outage is a heating emergency, not an inconvenience. Through an outage that can stretch a day or more in rural territory, a battery keeps the refrigerator, well pump, medical equipment, and a heat source running. That is resilience value rather than a financial return, and it should be weighed as such. Even a battery that never earns back its cost in arbitrage can be worth buying for a household that cannot afford to lose heat in a January outage. For most households a generator still provides backup for less money. What a battery offers instead is different: quiet, automatic power with nothing to refuel, and no carbon monoxide risk in a garage through a blizzard.

The payback verdict. In Idaho, arbitrage alone does not pay for a battery. The daily spread is real but the battery is expensive, the only utility payment is small and Rocky Mountain Power-only, and no program payment closes the gap. Buy the battery as backup. Size it for the loads that matter in an outage — heat, refrigeration, water, medical equipment — not for the whole house, check its cold-weather rating, and treat the spend as resilience, not as an investment.

Getting Quotes in Idaho: The Checklist

Idaho is a hard state to buy solar in — strong sun, cheap power, and an export rule that can triple or third the value of every panel — but only for a homeowner who checks the utility terms before the sales pitch. Run this checklist against every bidder, and sign nothing until each line has an answer in writing.

The ten-item quote checklist:

1. Your utility’s rules, in writing, first — Idaho Power’s Schedule 6 export rates by season and hour, Rocky Mountain Power’s Schedule 136, Avista’s Schedule 63, or your co-op or municipal utility’s own solar rate sheet. Export price and monthly service charge decide the payback before anything else — and Avista’s kWh netting is worth about nine years of payback against Idaho Power’s net billing.
2. Cash price per watt, in writing — identical kit, identical roof, all three bidders. The Idaho anchor is $2.95-$2.96 a watt; a quote far above it calls for an explanation, and a quote far below it calls for a closer look at what was left out.
3. No line for a 30% federal credit, no line for a state rebate — a 2026 owner purchase gets $0 federal, and Idaho has no state rebate, no sales-tax exemption, and no verified property-tax exemption. The state deduction is worth about $1,056 over four years, not $18,212. Any quote still deducting a 30% credit is priced under a dead law. Ask for it to be removed.
4. Sales tax shown as its own line — 6% state tax applies to solar equipment in Idaho, about $1,321 on the typical system, and a quote that omits it understates the cash price.
5. Daytime self-use modeled, not assumed — the share of production the house uses the moment it is made, shown by season and hour, with the export value priced at your utility’s own rates. On Idaho Power, a quote that values all exports at one blended price is wrong.
6. Both DOPL numbers verified — the installer’s DOPL electrical contractor number and contractor registration (RCE), checked on the registry, with names matched to the contract. Solar PV limited-installer licensing plus NABCEP certification is a plus.
7. Add-ons itemized — roof work, panel upgrade, tree work, snow guards, and battery, each as its own line, not folded into the per-watt price.
8. Production estimate from PVWatts, with the snow assumption shown — the anchor is about 1,506 kilowatt-hours per kilowatt a year, not nameplate wattage, and not an annual average that hides what the winter takes away.
9. Snow load, racking, and insurance confirmed — the roof’s snow-load rating checked with the building department, the racking’s uplift rating named, UL 61730 / IEC 61730 panels specified by name, and homeowners insurance confirmed in writing to cover the array before signing.
10. HOA approval, in writing, first — Idaho law (55-3208) bars an HOA from prohibiting rooftop solar, but the HOA may still set the location within 45 degrees of due south and impose reasonable placement rules, so approval must come before panels are ordered.

Buy, lease, or community solar? Over 25 years, buying wins for homeowners with high daytime use, Avista territory terms, or a backup-power reason to buy. With a purchase, the system, the resale value, and each kilowatt-hour of self-use all stay at full retail. Leasing wins for homeowners who want no upfront cost and no maintenance — but only where a lease is actually on offer, and in Idaho no provider was found selling one, so a lease quote should be read by a lawyer before it is compared at all. The State Energy Loan wins for homeowners who want cheap borrowing without a dealer fee — 3% for three years — but only if the loan is funded before installation begins and before December 31, 2026, when the program ends. Community solar wins for renters, condo owners, and homes whose roofs are shaded or unsuitable — but no general community-solar subscription was verified for Idaho homeowners in this guide, so treat any such offer as unverified until its terms are in writing.

Sources & methodology

Cost anchors (per watt, system size, totals):

• EnergySage state page, Nov 2026, updated Oct 30: $2.95/W; 12.04 kW average; $35,561 total; $30,227-$40,895 range
• EnergySage city pages, Nov 2026: Boise $3.29/W, 13.42 kW, $44,159; Nampa $3.16/W, 11.57 kW, $36,598; Pocatello $3.10/W, 11.44 kW, $35,416 (Jul 2026 page)
• EnergySage top installers, Oct 2026: Intermountain Wind and Solar; Idahome Energy (Boise, est. 2019)
• EcoGen Solar Cost Index, Sep 2026, prices as of Sep 25: $2.96/W; 7.44 kW typical from the Berkeley Lab 2025 median, 307 ID systems; $22,022 total; 1,506 kWh/kW/yr; 11,205 kWh/yr; 5.35 peak sun hrs; statewide payback ~25.7 yrs; neighbors MT $2.73, OR $2.77, US $2.89, UT $3.01, WY $3.14; ID rates +3.1%/yr; 12-mo avg price 12.77 cents
• EcoGen Idaho incentives page, Oct 2026: deduction example 7.52 kW, $23,237, $18,942 deducted; Idaho Power $100 and Rocky Mountain Power $85 application fees
• SolarReviews cost page, Nov 2026: $3.08/W; 6.3 kW average; $20,553 total; its $14,387 “after tax credit” column is stale and excluded
• HomeSolarAtlas, updated Aug 27, 2026: $3.00/W benchmark; 10 kW $30,000; production 13,600 kWh/yr (1,360/kW); benchmark from EnergySage marketplace average updated Aug 21, 2026
• RenewEstimator, data compiled Jul 25, 2026: $2.69/W; 8 kW $21,040; payback 16.5 yrs
• TheGreenWatt, 2026: $2.80/W; 5 kW $14,000; older EIA 2024/NREL Q1 2024 inputs, corroboration only
• ConsumerAffairs, 2026: $3.02/W; $39,351 typical install; payback 11.9 yrs; 25-yr savings $36,949; modeled outlier, flagged
• poweroutage.us, updated Apr 13, 2026: $3.45/W statewide; Idaho Falls $3.32/W, 5 kW ~$16,600; older methodology, corroboration only
• solarcostbyzip, Sep 2026: Meridian $3.06/W, 6 kW ~$18,400; Coeur d’Alene $3.06/W, 6 kW ~$18,400 — identical figures, templated estimate, flagged; its “after 30% federal tax credit” columns are stale and excluded
• findenergy, Aug 2025: Twin Falls County $3.56/W — stale, corroboration only
• NumeralQ Boise, Oct 2026: 8 kW system 11,792 kWh/yr (1,474/kW), PVGIS/NREL NSRDB, 20-degree tilt, south facing, 14% losses

Rates:

• EIA Electric Power Monthly Table 5.6.A, Oct 2026 release: ID 13.37 cents/kWh Aug 2026; US 18.16 cents; 5th-lowest of 51; 26.4% below US average; +10.7% YoY to Aug 2026; Aug bill $137.11 at 1,026 kWh; May 2026 12.35 cents, US 18.44 cents, cheapest in the nation that month
• EIA 12-mo averages to Aug 2026: ID 12.8 cents, ~$116/mo avg bill; average home use ~906 kWh/mo derived from the $116 bill at 12.8 cents
• EcoGen: 12-mo average 12.77 cents Sep 2025-Aug 2026; Idaho Power 12-mo avg 13.01 cents; used-at-home value 11.30 cents after the $15/mo service charge
• kadoa/EIA utility figures, 12 mo to Aug 2026: Idaho Power 13.0 cents, 555,075 customers, +12% YoY; Avista 12.8 cents, 131,568 customers, +11% YoY; PacifiCorp 13.4 cents, 77,382 customers, +2.2% YoY
• Avista Idaho Schedule 1, effective Oct 1, 2026: $20 basic charge; first 600 kWh 11.424 cents; over 600 kWh 12.712 cents, all-in
• Idaho Power Schedule 6 energy charges: 12.1195 cents/kWh summer / 9.9332 cents/kWh rest of year, first 800 kWh/mo, before adjustments; $15/mo service charge (EcoGen, Oct 2026)

Net metering and buyback:

• Idaho Power Schedule 6, real-time net billing since Jan 1, 2024 (IPUC Order 36048, Dec 29, 2023); Export Credit Rate effective Jan 1, 2026 (IPUC Order 36892, Schedule 6): summer on-peak 15.6836 cents/kWh (3-11 p.m., Mon-Sat, Jun 1-Sep 30, except holidays), other summer hours 3.3920 cents, non-summer 2.9019 cents, all hours; credits carry forward, do not expire, paid out only on move without new service; system limit 25 kW; $100 application fee
• IPUC Order 36785 (Sep 30, 2025): export rate cut about 31%; Idaho Power had proposed a 60% cut in April 2025; Jan 2024 cut from an average 8.8 cents to 6.18 cents; annual ECR updates suspended until 2028, next filing due Apr 1, 2028 (pv-magazine USA; net-metering census, Oct 27, 2026)
• Idaho Power legacy systems connected by Dec 20, 2019: one-for-one monthly kWh credits until Dec 2045, status passes to next owner, lost if offline more than six months or moved (EcoGen)
• Rocky Mountain Power Schedule 136 Net Billing Service, export credits effective Dec 1, 2025: Jun-Oct on-peak 14.666 cents (3-11 p.m.), off-peak 3.664 cents; Nov-May on-peak 5.597 cents (6-9 a.m., 6-11 p.m.), off-peak 1.228 cents; system limit 25 kW, must own; $85 application fee; older net metering closed Oct 2, 2020, customers keep monthly netting until Oct 2, 2045 (EcoGen, Oct 2026)
• Wattsmart Battery payment, changed Jul 1, 2026: $1,000 once (battery under 10 kW) or $2,000 (over 10 kW), plus $15 per kW a year up to $100 for four years, then $50 per kW up to $250 a year; was $400 per kW before Jul 1, 2026 (EcoGen)
• Avista Schedule 63 net metering: kWh-for-kWh credits; systems up to 100 kW, must own; yearly reset Mar 31, unused credits go to Avista; program limit 1.52 MW in the rule; EIA data shows 5.426 MW net-metered at Avista in Idaho in 2024 (EcoGen, Oct 2026)
• Kootenai Electric Cooperative: kWh-for-kWh credits, no expiry; $32.50/mo service charge; $0.00971/kWh loss charge on exports; no solar or battery rebate (EcoGen)

Incentives:

• Idaho Code 63-3022C, Residential Alternative Energy Device Deduction: deduct 40% of cost in year one, 20% in each of the next three years, max $5,000 a year, $20,000 total; no end date; buyer can use seller’s unused years; batteries and leases not addressed (Idaho Legislature; EcoGen; EnergySage, updated Jan 6, 2026)
• Idaho flat individual income tax rate 5.8%: deduction value on the typical system ~$1,056 over four years is NestPriced arithmetic ($5,000 x 5.8% = $290 yr 1; $4,404 x 5.8% = ~$255 yrs 2-4)
• Governor’s Office of Energy and Mineral Resources (OEMR) State Energy Loan: up to $40,000; 3% for 3 yrs, 5% for 5 yrs, 7% for 7 yrs; ends Dec 31, 2026 or when money runs out; must be funded before installation; $100 credit-analysis fee; secured by real estate; in-person closing (EcoGen; EnergySage)
• Sales tax: Idaho 6% state sales tax, no solar exemption verified; EnergySage: “Idaho doesn’t offer any sales or property tax exemptions for solar”
• Property tax: conflict — EnergySage says no exemption; Today’s Homeowner says property taxes will increase; solartech.org cites Idaho Code 63-602LL, but the section located, 63-602JJ, covers commercial producers only (3.5% gross-earnings charge in lieu of property tax); no residential exemption verified
• Solar for All: EPA ended grants Aug 2025, courts ruled the termination unlawful Sep 2026, EPA weighing appeal as of Oct 1, 2026; Inclusive Prosperity Capital paused Oct 5, 2026; no Idaho household route found
• HEAR/HOMES: DOE dataset via electricalcontractorsandwiring (Oct 27, 2026): $40,367,910 HEAR + $40,522,381 HOMES allocated to Idaho; not on DOE Feb 2026 launched map; OEMR program page quoted Sep 6, 2026 (HYRE census): “rebates are not currently available” and “we strongly advise against basing purchasing decisions on the anticipation of receiving a rebate at this time”

Federal and financing:

• OBBBA P.L. 119-21 and IRS FS-2025-05: §25D and §25C $0 for post-Dec-31-2025 installs, completion date counts
• §48E 30% for third-party-owned systems, in service by Dec 31, 2027, construction begun by Jul 4, 2026 per IRS Notice 2025-42
• DSIRE Third-Party Solar PV PPA Policies, May 2026: Idaho not listed as authorized; EcoGen (Oct 5, 2026): “third-party PPA legality is unclear” and “we found no one selling either [a lease or a PPA] to Idaho homes”
• Idaho Residential Solar Energy System Disclosure Act, Title 48, Chapter 18 (2019): written disclosures required for solar agreements including leases entered on or after Oct 1, 2019 (Idaho Code 48-1803)
• DOE Notice 26-2, Sep 1, 2026: HEAR electric-to-electric upgrades only, no fuel-switching; solar, batteries, EV chargers, windows outside HEAR
• CFPB Solar Financing Market Issue Spotlight, Aug 2024: dealer fees 10-30%, sometimes over 50%

Production and climate:

• EcoGen: 1,506 kWh/kW/yr PVWatts-based, Boise-class light; 7.44 kW makes ~11,205 kWh/yr; 5.35 peak sun hrs
• HomeSolarAtlas: 1,360 kWh/kW/yr standardized benchmark; 10 kW makes 13,600 kWh/yr
• NumeralQ Boise PVGIS modeling (NREL NSRDB, 20-degree tilt, south facing, 14% losses): 8 kW makes 11,792 kWh/yr (1,474/kW)
• RenewEstimator: 4.1 sun hrs (different method, lower); engineerfix: ~4.92 sun hrs/day statewide average, 5.0-5.48 in Twin Falls/Boise
• Boise climate: about 210 sunny days a year; ~11.7 inches precipitation a year; snowfall about 18-20 inches a year (1991-2020 normals: 19 inches; December snowiest at about 7 inches); Dec daylight about 9 hours, Jun-Jul 15+ hours (1991-2020 normals)
• Heat penalty 0.3-0.5% per degree C above 25 C cell temperature, national figure
• Hail: no Idaho-specific hail statistics pulled; Oklahoma Hail Alley numbers not imported; UL 61730 / IEC 61730 remains the specification to ask for

Payback arithmetic:

• The worked examples in the payback section are EcoGen’s per-utility figures of Oct 30, 2026, restated: 7.44 kW x $2.96/W = $22,022; production ~11,205 kWh/yr; Idaho Power year-one value ~$794/yr (40% self-use at 11.30 cents = $507; 60% exported at 4.27 cents average = $287); $22,022 divided by $794 ~ 27.7 yrs; at the lowest 2.9019-cent export credit 31.4 yrs; statewide ~25.7 yrs; Avista ~18.8 yrs; Rocky Mountain Power ~29.1-39.6 yrs
• The deduction shortens the Idaho Power payback by about 1.3 years at $794/yr (~$1,056 over four years)
• RenewEstimator’s 16.5-year and ConsumerAffairs’ 11.9-year paybacks are flagged as modeled estimates that do not price Idaho Power’s ~3-cent export rate

HOA and licensing:

• Idaho Code 55-3208 (2022, ch. 323; HB 158): HOA may not prohibit rooftop solar; may set location if south-facing within 45 degrees east or west of due south permitted; reasonable rules (parallel to roofline, conform to slope, painted frames/piping/wiring); applies only to rooftops owned, controlled, and maintained by the homeowner
• PluggedIn Solar and similar 2026 surveys listing Idaho among states with no solar-access law are WRONG against the primary statute; excluded
• Idaho Electrical Board / DOPL licensing: Solar Photovoltaic limited electrical installer, 4,000 hours plus NABCEP photovoltaic installer certification or equivalent (IDAPA 24.39.10.200); limited electrical contractor; electrical contractor must be or employ a licensed master electrician; $300,000 liability insurance plus workers’ compensation; contractor registration (RCE) separate from the electrical license (DOPL; servicetitan; idahoclc; nextinsurance)
• Big Dog Solar: electrical contractor 017916, active to Feb 28, 2027; contractor registration RCE-36953, active to Mar 11, 2028; Idahome Energy: RCE 65198 (checked Oct 13, 2026)

Labor:

• BLS Occupational Employment and Wage Statistics May 2025: electricians 47-2111 Idaho, median $30.29/hr, $63,000/yr; mean $32.02/hr; 10th-90th $18.67-$45.90/hr; 5,690 employed; national median $30.38/hr; metro medians Boise City $29.62, Idaho Falls $31.42, Coeur d’Alene $31.90
• Solar PV installers 47-2231: no Idaho-specific BLS figure found, BLS publishes state-level wages for only 32 states; national median $53,140/yr, ~$26/hr, 31,100-31,350 jobs nationally, BLS projects +37% growth 2025-35, BLS Occupational Outlook Handbook May 2025

Maintenance, lifespan, warranty (national figures):

• Lifespan 25-30 years productive service; NREL median degradation ~0.5%/yr, ~88% of rated output at year 25; premium n-type 0.25-0.5%/yr, 91-93% at year 25 (NREL Jordan et al. 2022)
• Product warranty typically 10-25 years; performance warranty typically 25-30 years, guaranteeing 80-92% of rated output at year 25 depending on tier; string inverter 10-15 years, one replacement expected; microinverters ~25 years

EXCLUDED:

• Any “after 30% credit” prices, including SolarReviews’ $14,387 column and solarcostbyzip’s “after 30% federal tax credit” columns
• Any HEAR-for-solar claim: HEAR does not cover solar, batteries, EV chargers, or windows; electric-to-electric only since DOE Notice 26-2, Sep 1, 2026
• Any state rebate, sales-tax exemption, or verified residential property-tax exemption for Idaho solar: none verified / none exists as a rebate
• RenewEstimator’s 16.5-year payback and ConsumerAffairs’ 11.9-year payback: modeled estimates that do not price Idaho Power’s ~3-cent export rate
• EcoGen’s incentives-page example system (7.52 kW, $23,237): different from the cost-page typical system (7.44 kW, $22,022); the draft uses the cost-page system and computes its own deduction
• Avista and Rocky Mountain Power worked payback arithmetic: EcoGen’s published figures used without re-derivation
• A single blended Idaho Power export rate: the draft shows the three rates separately (15.6836 / 3.3920 / 2.9019 cents), except where EcoGen’s 4.27-cent IPUC average is labeled as an average
• Idaho Falls Power and smaller co-op/municipal solar terms; Avista interconnection application fee; Idaho-specific permit fee schedule, interconnection timeline, and battery price (national figure used)
• Idaho-specific monthly PVWatts production table: seasonal shape described qualitatively
• Idaho-specific design snow-load / wind figures: not verified, roof/racking risk described qualitatively
• BLS solar-PV-installer wage for Idaho: not published/found, national figures used, flagged as national
• Idaho-specific hail statistics: not pulled; Oklahoma Hail Alley numbers not imported
• The claim that Idaho has no solar-access law: WRONG against Idaho Code 55-3208 (2022); excluded
• The claim that Idaho declined/rejected IRA HEAR/HOMES funding: secondary-tracker claim, not verified from a primary source; the draft states only the verifiable fact
• A residential property-tax exemption under Idaho Code 63-602LL: not verified; 63-602JJ is the commercial-producer provision; excluded as fact

*Disclaimer: The prices here are 2026 Idaho planning figures. The numbers move with the city, the roof, the utility territory, and the contractor. Line up three written quotes from Idaho installers before you settle on a budget. Read the tax notes in this guide as general information only — not as advice for your own return. Talk to an Idaho tax professional before you file. Program rules change — Idaho Power Schedule 6, Rocky Mountain Power Schedule 136, Avista Schedule 63, co-op terms — so confirm current terms with Idaho Power, Rocky Mountain Power, Avista, or your own utility before signing. Idaho Power’s export rates are set until its filing due April 1, 2028, and the State Energy Loan ends December 31, 2026 — rate and program figures in this guide are dated to their sources.*