Which utilities serve Idaho for solar?

Idaho's three largest electric utilities are Idaho Power (the dominant IOU, serving most of the state including Boise), Rocky Mountain Power (serving eastern Idaho), and Avista Utilities (serving the northern Panhandle region). Idaho Power and Rocky Mountain Power offer retail-rate net metering. Avista and smaller cooperatives may have different solar crediting structures — verify with your utility before obtaining quotes.

How much do solar panels cost in Idaho?

Idaho homeowners typically pay about $2.50/W before incentives. For an 8 kW system, that is roughly $20,000. The state offers only a tax deduction (40% year one, 20% years two through four) — no cash rebate or tax credit. The federal residential credit (Section 25D) expired December 31, 2025 and is not available for 2026 projects. Idaho's low installation costs help, but the savings value is limited by $0.13/kWh rates.

Is solar worth it in Idaho?

Solar in Idaho works for the right homeowner, but expectations must be calibrated. At $0.13/kWh, Idaho has some of the cheapest electricity in the country, which means each solar kilowatt-hour saves very little. Payback of 10–14 years is realistic — faster than that requires exceptional roof exposure, disciplined installation cost, and strong self-consumption. It is a long-term production investment, not a quick-return financial product.

Does Idaho have net metering?

Yes. Idaho Power and Rocky Mountain Power offer retail-rate net metering for residential solar customers — exported power earns bill credit at the same rate you pay for grid electricity. This is favorable policy, but because Idaho's rates are only $0.13/kWh, the dollar value per exported kilowatt-hour remains modest. Avista Utilities and smaller co-ops may have different terms.

Why is Idaho solar payback so long compared to other states?

Two reasons: price and policy. Idaho's $0.13/kWh rate, driven by abundant low-cost hydroelectric generation, is among the lowest in the nation — so each solar kilowatt-hour saves very little in dollar terms. Second, the state offers only a tax deduction (not a cash rebate or refundable credit), and with the federal Section 25D credit expired for 2026, there is no upfront cash incentive to reduce installed cost. The combination of cheap power and thin incentives makes Idaho one of the most challenging solar payback markets in the U.S.

State Guide

Solar Panel Cost in Idaho (2026)

Q: What solar incentives are available in Idaho?

Idaho offers a state income tax deduction — 40% of system cost can be deducted in year one and 20% in each of years two through four. There are no cash rebates, no state tax credits, and no SREC market. The federal residential credit (Section 25D) expired December 31, 2025 and is not available for 2026 projects. The tax deduction value depends on your income level; it provides meaningful relief only for households in higher marginal tax brackets.

See how much solar panels cost in Idaho with local electricity rates, incentives, and payback estimates.

Last updated: 2026-06-09· Source label: EIA residential electricity rates, IRS federal clean energy credit, NREL/PVWatts solar assumptions

Idaho is one of the toughest solar payback states in the country — not because of poor sun, but because electricity is incredibly cheap. At $0.13/kWh (EIA March 2026), residential rates are among the lowest in the nation, driven by abundant hydroelectric generation. Idaho Power dominates the utility landscape, with Rocky Mountain Power and Avista Utilities covering smaller territories. Retail net metering is available from Idaho Power and Rocky Mountain Power, which is a bright spot, but the state offers only a tax deduction (40% year one, 20% years two through four) — no cash rebate, no state tax credit, and no SREC market. Systems need disciplined installed pricing and strong roof orientation to achieve reasonable payback. Solar in Idaho is a long-term, production-driven play, not a quick-return financial product.

$0.13/kWhAvg. Electricity RateBelow the national average — among the lowest rates in the country due to abundant hydroelectric generation. Solar savings value per kWh is limited. EIA March 2026.

8-10 yearsSolar PaybackVery low $0.13/kWh rates and no cash rebate make Idaho one of the longest solar payback states — even with retail net metering

$2.50/WAvg. Install CostFor a typical 8 kW system, roughly ~$20,000 before incentives. The federal residential credit (Section 25D) expired Dec 31, 2025 and is not available by default for 2026 projects.

ColdClimate ZoneASHRAE/IECC heating climate zone classification

$0.78/thermNatural Gas PriceEIA residential price

Net cost before federal residential credit~$20,000At $2.50/W for an 8 kW system. Idaho's tax deduction (40% year 1, 20% years 2-4) provides ongoing tax relief but no upfront cash. No 2026+ federal credit applied.

Estimated payback8-10 yearsLimited by $0.13/kWh rates. Even with retail net metering and strong 5.0 peak sun hours/day, Idaho's cheap hydro power makes competing on price difficult.

Annual bill offset$1,200-$1,600/yrEstimate for an 8 kW system at $0.13/kWh with 5.0 peak sun hours/day and PVWatts-style production. Lower savings than any other state in this tool.

Estimates based on idaho state averages. Your actual cost depends on roof, equipment, installer, and financing.

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Overview

Use this result

Use the calculator inputs first, then compare the result against local rates, incentives, roof conditions, and utility export rules.

Method, assumptions, and sourcesOpen this section when you want to audit the calculation behind the estimate.Show

Calculation Method

Idaho solar payback = net installed cost after incentives / annual avoided electricity cost plus export credits

Key Assumptions

Policy last reviewed: 2026-06-09. Federal residential credit assumptions are project-year dependent and not applied by default for 2026+ projects.
Residential rate and installed-cost figures are planning benchmarks, not a final utility bill audit or installer quote.
The model assumes a roof with usable sun exposure; shading, roof age, electrical upgrades, permitting, and financing can materially change cost.
Idaho economics should be checked against lower average rates, utility-specific export credit treatment, and cold-weather and irrigation-load differences.
The federal tax credit only helps households with sufficient tax liability and qualifying project documentation.

Data Sources

Electricity rates

EIA Electric Power Monthly

Residential electricity-rate benchmark used for avoided-bill savings.

Solar production

NREL PVWatts

Solar production assumptions should be checked against local roof orientation, shading, and climate.

Federal incentive

IRS Residential Clean Energy Credit

Supports 2026 Section 25D expiration (residential ITC no longer available by default) for qualifying residential solar costs.

State and utility policy

DSIRE and local utility tariff pages

Used as a reminder to verify state incentives, net-metering, export-credit, and rebate rules before relying on an estimate.

Result Summary

Net cost before federal residential credit

~$20,000

At $2.50/W for an 8 kW system. Idaho's tax deduction (40% year 1, 20% years 2-4) provides ongoing tax relief but no upfront cash. No 2026+ federal credit applied.

Estimated payback

8-10 years

Limited by $0.13/kWh rates. Even with retail net metering and strong 5.0 peak sun hours/day, Idaho's cheap hydro power makes competing on price difficult.

Annual bill offset

$1,200-$1,600/yr

Estimate for an 8 kW system at $0.13/kWh with 5.0 peak sun hours/day and PVWatts-style production. Lower savings than any other state in this tool.

Compare Solar Costs With Neighboring States

Solar economics vary by state. Compare Idaho with nearby states to see how electricity rates, incentives, and payback periods differ in your region.

Montana Solar CalculatorElectricity rate$0.13/kWhPayback period10 yrsNet meteringNet metering at reta Washington Solar CalculatorElectricity rate$0.14/kWhPayback period10 yrsNet meteringFull retail net mete Oregon Solar CalculatorElectricity rate$0.15/kWhPayback period9 yrsNet meteringFull retail net mete Utah Solar CalculatorElectricity rate$0.13/kWhPayback period8 yrsNet meteringNet metering at avoi

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Solar Panel Cost in Idaho (2026)

Incentives & Rebates

Federal Residential Credit Caveat

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Net Metering

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