Idaho solar calculator
Size a Idaho home solar system from your electric bill — kW, panel count, roof area, true cost with no federal credit for 2026 installs, and payback.
Quick answer: At $0.124/kWh and 4.9 peak sun hours, a $200/month bill needs about 14.35 kW — 35 × 410 W panels covering ~70 m². Gross cost is ~$42,691 with no federal credit for systems installed after 2025, offsetting $2,400 a year for a ~17.8 year payback.
Your details
Ballpark, not gospel. Sized at 78% real-world output with the Idaho sun-hour average — confirm shading, roof angle and your utility's export terms with a local installer before buying. The calculator values all generation at your retail rate; Idaho Power pays time-varying net-billing credits well below retail, so real savings track self-consumption and batteries.
The 30% credit ended — what changed
The residential clean energy credit (26 U.S.C. § 25D) gave homeowners a 30% credit on solar installed from 2022 through 2025. The July 2025 tax law ended it: no credit is available for property placed in service after December 31, 2025. That is why every figure on this page is ~30% higher than pre-2026 guides show. If your system went live by the end of 2025, tick the box above to see the credit applied; leased systems may still benefit because the leasing company claims the commercial credit. Source: IRS — Residential Clean Energy Credit.
Typical Idaho system sizes by monthly bill
| Monthly bill | System size | Panels (410 W) | Net cost (no 2026 federal credit) | Payback |
|---|---|---|---|---|
| $100 | 7.38 kW | 18 | $21,955 | 18.3 years |
| $200 | 14.35 kW | 35 | $42,691 | 17.8 years |
| $300 | 21.32 kW | 52 | $63,427 | 17.6 years |
Computed at $0.124/kWh, 4.9 peak sun hours and $2.97/W installed, with no federal credit for 2026 installs. Run your exact bill above.
Solar in Idaho: the details
Solar cost in Idaho
Solar is mid-range to install in Idaho. The EnergySage marketplace averaged about $2.97 per watt installed in 2026, with market quotes typically landing $2.53–$3.42/W — inside the $2.50–$3.50/W national band. A typical ~14 kW system grosses around $41,700, with no federal credit for 2026 homeowner installs.
What moves the number: cheap power means big systems — Idaho's $0.124/kWh rate forces a ~14 kW array to offset a $200 bill. Roof complexity and panel tier matter, but the bill math dominates.
Export rules: getting paid for surplus power
Idaho has no statewide net-metering mandate — your utility sets the terms. Idaho Power (most of southern Idaho) puts new systems on net billing with time-varying export credits well below retail.
Two bright spots: systems already on retail netting are grandfathered until 2045, and some utilities — Avista, for example — still bank kWh 1:1. Buying a home with grandfathered net metering is a genuine asset.
Practical takeaway: in Idaho Power territory, exports are discounted, so self-consumption rules. Check your specific utility before sizing — the difference between 1:1 banking and time-varying credits is the difference between a decent and a poor payback.
Idaho solar incentives
No major statewide solar incentive was found in 2026 sources — Idaho offers no state rebate, income tax credit, or equipment exemption for solar.
Is solar worth it in Idaho?
Verdict: honestly, marginal. Cheap electricity ($0.124/kWh) is the whole story — with Idaho Power paying time-varying export credits well below retail and no state rebate, a $200 bill faces a ~17.8-year payback. Solar here is a values-and-resilience purchase, not an economic one, unless you're on a co-op with better terms.
Questions people actually ask
Straight answers, no fluff. Then run your own numbers above.
How many solar panels do I need in Idaho?
It follows your bill. At the Idaho average of $0.124/kWh and 4.9 peak sun hours, a $200/month bill needs about a 14.35 kW system — roughly 35 × 410 W panels covering ~70 m² of roof.
What is the average cost of solar panels in Idaho in 2026?
The EnergySage marketplace averaged about $2.97 per watt installed in 2026, with market quotes typically $2.53–$3.42/W — inside the national $2.50–$3.50/W band. A typical ~14 kW system grosses around $41,700, with no federal credit for 2026 homeowner installs.
Does Idaho have net metering?
No statewide mandate. Idaho Power (most of southern Idaho) puts new systems on net billing with time-varying export credits well below retail; systems already on retail netting are grandfathered until 2045, and some utilities like Avista still bank kWh 1:1.
Does Idaho offer any solar tax credit or rebate?
No major statewide solar incentive was found in 2026 sources — Idaho offers no state rebate, income tax credit, or equipment exemption for solar.
Is the 30% federal solar tax credit still available?
Not for homeowner purchases anymore. The residential clean energy credit (26 U.S.C. § 25D) is not available for property placed in service after December 31, 2025, under the July 2025 tax law (Public Law 119-21). Systems installed by the end of 2025 can still claim 30%, and leased systems may still benefit because the leasing company claims the commercial credit instead. (Source: IRS — Residential Clean Energy Credit.)
Is solar worth it in Idaho?
Verdict: honestly, marginal. Cheap electricity ($0.124/kWh) is the whole story — with Idaho Power paying time-varying export credits well below retail and no state rebate, a $200 bill faces a ~17.8-year payback. Solar here is a values-and-resilience purchase, not an economic one, unless you're on a co-op with better terms.
Figures last checked October 2026. Sources: residential rate and sun-hour averages via kilowattkit.com and unboundsolar.com's US sun-hours map, EIA Electric Power Monthly, NREL PVWatts/NSRDB, DSIRE, Idaho Public Utilities Commission; IRS — Residential Clean Energy Credit.
More US solar calculators
Compare other states: Texas, Florida, California, Arizona, North Carolina, Alabama, Alaska, Arkansas, Colorado, Connecticut, Delaware, Georgia, Hawaii, Idaho. And the national US solar calculator for country averages.
Comparing quotes? The solar cost calculator breaks down cost per watt and the solar ROI calculator maps your payback year by year. Going deeper: installation cost guide, how net metering works, how much you can save with solar and the solar batteries guide.