US residential solar · 2026 data

Solar Panels in Idaho

Q: "How long is the solar payback period in Idaho?"

"For most Idaho homeowners in 2026, the payback period runs 10–13 years on a cash purchase. At Idaho's average electricity rate of 10.4 cents per kWh, an 8 kW system saves roughly $1,092 per year. After the 30% federal tax credit reduces the net cost to about $18,500, the break-even point lands at approximately 11 years. Homeowners with EVs, heat pumps, or higher overall energy use typically see payback in 9–10 years."

Q: "Is there a state solar tax credit in Idaho?"

"No. Idaho's state solar income tax credit expired and was not renewed for 2026. The main financial incentives are the 30% federal ITC (worth $5,550 on an $18,500 system), a full property tax exemption on solar-added home value, and a 6% sales tax exemption on equipment. Rural homeowners operating a farm or small business may also qualify for USDA REAP grants covering up to 50% of project cost."

Q: "Does Idaho Power offer net metering in 2026?"

"Yes. Idaho Power offers net metering under Schedule 84, crediting surplus energy at the full retail rate of approximately 10.4 cents per kWh. Credits roll forward monthly but unused credits at year-end are compensated at the lower avoided-cost rate of around 3–4 cents per kWh. Customers who interconnect before any pending PUC rate revision are grandfathered into retail-rate credits for 20 years. Rocky Mountain Power customers in eastern Idaho receive a slightly lower credit rate."

Q: "What size solar system do I need for a typical Idaho home?"

"The average Idaho home uses about 900–1,000 kWh per month. At 4.5–5 peak sun hours per day in southern Idaho, a 7–8 kW system typically covers 90–100% of annual consumption. Homes with electric heat, an EV, or larger square footage should consider 10–12 kW. NREL data shows Idaho's average installed residential system in 2024 was 7.8 kW, consistent with national averages."

Q: "Can I go fully off-grid in Idaho?"

"Yes, but it requires a larger system plus substantial battery storage. A grid-tied system with battery backup delivers about 95% of the resilience benefit at significantly lower cost than going fully off-grid. Rural Idaho properties served by unreliable co-op utilities see stronger economics for off-grid setups. Expect a full off-grid system with 2–3 days of battery autonomy to cost $35,000–$60,000 before any incentives apply. *Data sources: U.S. Energy Information Administration (EIA) Electric Power Monthly, January 2026; National Renewable Energy Laboratory (NREL) Tracking the Sun, 2024; Solar Energy Industries Association (SEIA) Solar Market Insight Q4 2025; IRS Form 5695 and IRS Publication 946 (2025 tax year); Idaho Public Utilities Commission Order No. 36318 (net metering); USDA Rural Energy for America Program (REAP) 2025; Lawrence Berkeley National Laboratory \\\"Selling Into the Sun\\\" home value study, 2019.*"

SAVE

$0+

Over 25 Years

$16,800 Cost after ITC

20.6 yrs Payback

8.0 kW Typical system

Most homeowners need:

18–22 panels typical
8.0 kW average system
$16,800 after tax credits
20.6 year payback

✓ Updated monthly ✓ NREL data ✓ Reviewed by solar experts ✓ IRS tax credit included

Updated June 9, 2026 · 9 min read ·By Mark Sullivan ·Reviewed by Green Energy Calculators Editorial Team

Calculate My Savings View Idaho Solar Data

Without solar vs with solar

25-year cost comparison for a $300/month US electric bill.

Without solar

25-year utility cost

$34,600

Rates rise ~3% per year (EIA avg.)

With solar

Net system cost

$16,800

After 30% federal ITC

Your savings

Difference

+$17,800

Estimated lifetime advantage

Author Mark Sullivan

Reviewed by Green Energy Calculators Editorial Team

Last updated Jun 9, 2026

Sizing formula kW = Annual kWh ÷ (Peak Sun Hours × 365 × 0.82)

Idaho homeowners who install a typical 8 kW solar system in 2026 can expect to pay around $18,500 after the 30% federal tax credit — and see electricity bills drop by an average of $900 to $1,100 per year. That combination puts Idaho’s solar payback period at roughly 10–12 years, which is mid-range compared to high-rate states like California but still a sound long-term investment given Idaho’s sunny climate and 25-year panel warranties.

The Gem State averages 205 sunny days per year, and much of southern Idaho — including the Treasure Valley and Magic Valley — receives between 4.5 and 5.5 peak sun hours daily. That’s enough to make rooftop solar genuinely productive, even if electricity rates here are among the lowest in the nation at around 10.4 cents per kWh (EIA, 2025). Low rates are the single biggest reason Idaho’s solar payback period is longer than, say, Massachusetts or Hawaii; it simply takes more time to offset a modest electricity bill.

This guide covers every number you need to evaluate a solar purchase in Idaho — upfront costs, the 30% federal tax credit, Idaho Power’s net metering program, property tax exemptions, and realistic savings projections. All figures are based on 2025–2026 data from the EIA, NREL, and SEIA.

What Does Solar Actually Cost in Idaho in 2026?

Before incentives, a fully installed residential solar system in Idaho runs between $2.80 and $3.40 per watt, putting an average 8 kW system at $22,400 to $27,200. After applying the 30% federal Investment Tax Credit (ITC), that range drops to roughly $15,680 to $19,040. Most Idaho homeowners land around $18,500 as a net cost after the credit — a figure that has held relatively stable since 2023 as panel prices leveled off.

System size matters considerably. A smaller home consuming 700–800 kWh per month can often get by with a 6 kW system (net cost approximately $13,900), while larger homes or those planning to charge an electric vehicle may want 10 kW or more (net cost $23,000+). NREL data shows Idaho’s average residential system installed in 2024 was 7.8 kW — roughly in line with the national average of 8.2 kW.

Installation costs in Boise are slightly lower than in rural Idaho because labour markets are more competitive and permitting is faster. Remote areas of northern or eastern Idaho can add 8–12% to the total due to logistics and smaller installer pools. Homeowners in Twin Falls or Pocatello typically fall between these two extremes.

Financing shapes the true out-of-pocket cost considerably. Cash buyers get the cleanest economics, but solar loans have become competitive — typical terms in 2026 run 5–7% APR over 10–20 years. A homeowner financing $18,500 at 6.5% over 15 years pays about $161 per month, which often sits close to (or below) their current electricity bill, creating near-immediate cash-flow neutrality. Use the solar loan calculator to compare loan structures against a cash purchase with your specific numbers.

One cost that’s often missing from headline quotes: most Idaho installers charge $300–$600 for the interconnection application fee required by Idaho Power. It’s not large, but worth confirming upfront so the final invoice matches expectations.

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Idaho Solar Incentives You Can Actually Use in 2026

The federal solar tax credit remains the most valuable incentive available to Idaho homeowners. Under the Inflation Reduction Act, the ITC allows you to claim 30% of total system cost directly against your federal income tax liability. On an $18,500 system, that’s a $5,550 credit — a dollar-for-dollar reduction in what you owe the IRS, not a deduction. The credit applies to equipment, labour, and permit fees, and can be carried forward to future tax years if your liability in year one is insufficient. Use the solar tax credit calculator to estimate your exact credit based on system price and income.

Idaho does not offer a separate state income tax credit for solar as of 2026 — a credit that existed in earlier years was not renewed. However, two state-level benefits remain significant and are easy to overlook.

Property tax exemption: Idaho Code § 63-602G exempts the added home value from solar panels from property tax assessment. In practice, solar typically adds 3–4% to a home’s resale value (Lawrence Berkeley National Laboratory, 2019). On a $350,000 home, that’s $10,500 to $14,000 in value that goes untaxed, saving $100–$175 per year depending on your county’s mill levy. Over a 20-year period, this exemption quietly contributes $2,000–$3,500 in cumulative savings. For more on this topic, see our guide to Solar Panels in Alabama.

Sales tax exemption: Idaho exempts solar equipment from the state’s 6% sales tax. On a $25,000 gross system cost, that’s roughly $1,500 in savings — though most installers already back this out of their quotes, so confirm how your installer presents pricing.

Federal USDA REAP grants are available for rural Idaho homeowners who operate any kind of small business or farm on the property. REAP can cover up to 50% of project cost, and awards in Idaho have run $8,000–$45,000 for residential-scale agricultural systems. The application window typically opens in spring; check the USDA Rural Development website for current deadlines.

All told, an Idaho homeowner combining the 30% ITC, the property tax exemption, and the sales tax exemption on a $25,000 gross system can realistically reduce their effective net cost by $9,000–$11,000 over the first 20 years of ownership — a figure that improves materially for rural REAP-eligible properties.

How Much Will You Save on Electricity in Idaho?

At Idaho’s average retail electricity rate of 10.4 cents per kWh (EIA, 2025), annual savings are more modest than in high-rate states — but still meaningful over a 25-year system lifespan. An 8 kW system in Boise producing around 10,500 kWh per year offsets roughly $1,092 in annual electricity costs. Over 25 years — the standard panel warranty period — that’s $27,300 in gross savings before factoring in rate increases.

Idaho electricity rates have risen at an average of 2.1% per year over the past decade (EIA). At that trend rate, annual savings grow from $1,092 today to roughly $1,760 by year 25, bringing lifetime gross savings closer to $36,000–$38,000 on a properly sized system. That comfortably exceeds the net installed cost of $18,500 for most households.

Homeowners with higher-than-average consumption see meaningfully better economics. Anyone running a heat pump, electric water heater, or EV charger can push annual consumption to 15,000–20,000 kWh. At that scale, a 10–12 kW system saves $1,600–$2,100 per year and typically pays back in 9–11 years. The solar EV charging savings calculator models how adding an EV changes your offset and payback timeline specifically.

Grouped bar chart comparing Idaho solar net installed cost versus 25-year electricity savings for 6kW, 8kW, and 10kW systems — **Idaho solar: net cost vs. 25-year savings by system size.** An 8 kW system costs roughly $18,500 after incentives and generates approximately $36,000 in lifetime electricity savings — nearly double the upfront investment. Source: EIA, NREL, SEIA 2026.

For context, homeowners in Oregon pay rates around 13 cents per kWh, which trims their payback by 2–3 years compared to Idaho. The low-rate trade-off is real, but the long lifespan of modern panels means the total return still outpaces most conventional home improvements.

Idaho Net Metering Rules by Utility

Net metering determines how much you’re compensated when your panels produce more electricity than your home uses in a given period. In Idaho, the rules differ by utility, and the differences are significant enough to affect how you size your system.

Idaho Power (the state’s largest utility, serving most of the Treasure Valley and southern Idaho) offers net metering to residential customers under Schedule 84. Credits are issued at the full retail rate — 10.4 cents per kWh — for surplus energy sent to the grid each month. Any remaining credit rolls forward on your bill. However, Idaho Power does not offer an annual true-up: credits that roll into a new calendar year are forfeited at the retail rate and compensated at a lower avoided-cost rate of approximately 3–4 cents per kWh. That’s a steep drop. For this reason, sizing your system to avoid large annual surpluses is often smarter than oversizing to maximize production.

Rocky Mountain Power (serving eastern Idaho, including Pocatello and Idaho Falls) operates a different structure. Excess generation earns credits at roughly 9–9.5 cents per kWh — close to retail but not identical — and the program uses a monthly true-up, so credits do not carry across months.

Smaller co-ops and municipal utilities: Some rural cooperative utilities in Idaho are not required to offer net metering under state law. Always verify your specific utility’s tariff before signing a solar contract, as terms vary widely outside the two major investor-owned utilities.

The 2025 amendments to Idaho’s net metering rules placed a statewide cap at 0.5% of each utility’s peak demand. Idaho Power hit this threshold in 2023 and has since petitioned the Idaho Public Utilities Commission for revised compensation structures. Customers who interconnect before any rate revision is formally approved are grandfathered into existing retail-rate credits for 20 years — a concrete reason to move forward sooner rather than waiting.

Homeowners near the Idaho-Nevada or Idaho-Utah border should compare utility territories carefully, as cross-border installer quotes sometimes include assumptions about net metering terms that don’t apply to Idaho Power or Rocky Mountain Power customers.

Choosing the Right Solar Installer in Idaho

Idaho’s solar market has grown steadily but remains smaller than neighboring Nevada or Utah, which means installer choice matters more than it does in saturated markets. In 2024, SEIA reported approximately 38 active residential solar installers operating in Idaho — enough competition to drive reasonable pricing, but not so many that vetting is straightforward.

Get at least three written quotes before committing. Prices for the same 8 kW system from different Idaho installers can vary by $3,000–$5,000, often reflecting differences in panel brand, inverter type, and labour costs rather than actual system quality. Ask each installer for their specific panel brand (tier-one manufacturers include LG, REC, Qcells, and Panasonic), inverter type (string inverters vs. microinverters), and whether their quote includes the interconnection fee.

Verify that your installer is licensed with the Idaho Division of Building Safety and carries both general liability and workers’ compensation insurance. Unlicensed installations can void equipment warranties and create complications when you sell the home.

Warranty terms to demand: panels should carry a 25-year product and performance warranty guaranteeing at least 80% output at year 25. Inverters typically carry 10–12 years; some manufacturers now offer 25-year inverter warranties for a modest upgrade fee. Workmanship warranties from the installer should be at least 10 years.

Ask installers whether they handle the Idaho Power or Rocky Mountain Power interconnection application on your behalf. The best installers manage the full process, including scheduling the utility inspection, which typically takes 2–6 weeks in Idaho’s major markets. System installation itself usually takes one to two days once permits are issued — permitting in Ada County averages 7–10 business days, while rural counties can take 3–5 weeks.

Idaho’s residential solar market added roughly 4,200 new installations in 2024, up 18% from 2023 (SEIA), meaning more installers are building local track records you can verify through the Better Business Bureau and Google Reviews. Prioritise installers with at least 50 completed Idaho projects. Before committing to any quote, run your actual figures through the solar savings calculator to see your projected return based on your utility rate and expected system output.

Frequently asked questions

Direct answers for US homeowners in Idaho.

How long is the solar payback period in Idaho?

For most Idaho homeowners in 2026, the payback period runs 10–13 years on a cash purchase. At Idaho's average electricity rate of 10.4 cents per kWh, an 8 kW system saves roughly $1,092 per year. After the 30% federal tax credit reduces the net cost to about $18,500, the break-even point lands at approximately 11 years. Homeowners with EVs, heat pumps, or higher overall energy use typically see payback in 9–10 years.

Is there a state solar tax credit in Idaho?

Does Idaho Power offer net metering in 2026?

What size solar system do I need for a typical Idaho home?

Can I go fully off-grid in Idaho?

Idaho solar by electric bill

See system size and payback for common monthly bills in Idaho.

$200 $200/month electric bill Panels · cost · payback → $300 $300/month electric bill Panels · cost · payback →

View Idaho solar data & incentives →

Popular utility companies

Solar rules and net metering vary by utility — not just by state.

Idaho Power Southern ID Avista North Idaho Rocky Mountain Power East Idaho United Power Rural cooperatives Fall River Electric Eastern ID City of Idaho Falls Municipal

Methodology & data sources

Calculation method: System size uses NREL PVWatts derate factor (0.82). Costs based on SEIA 2026 installed cost ($2.75–$3.20/W). Payback uses net cost after 30% federal ITC (IRC Section 25D). Savings assume full-retail net metering unless noted.

Official sources: EIA state electricity rates · NREL PVWatts · Energy.gov ITC guide · DSIRE incentives · SEIA market data · IRS Publication 5695.

All figures are estimates for educational purposes — not tax, legal, or investment advice. Consult a licensed installer and CPA for your situation.