Solar calculator for Idaho

The average Idaho home uses 944 kWh a month and pays 11.5 cents per kWh, which puts Idaho at some of the cheapest electricity in the country, which stretches payback. Winter heating shapes the bill in Idaho, and winter is when panels make the least, so a bill that looks big in January does not map cleanly to a bigger array. A south-facing fixed array there makes about 1,468 kWh per installed kW a year, and the worst winter month still gets 2.1 peak sun hours a day. Drop in your own bill below and the numbers on this page are replaced by yours.

A worked example for Idaho

Take the average home: 944 kWh a month, which is 11,328 kWh a year, at 11.5 cents per kWh (EIA, 2024 residential averages, as of 2026-11). Sized to cover all of that use, the tool returns 7.7 kWdc and 19 panels, needing about 399 square feet of roof. The installed estimate is $19,214 (national median, EnergySage H2 2025), yearly savings are about $1,303, and simple payback is 14.7 years, with no incentive applied.

Sun and yield in Idaho

We use 1,468 kWh per installed kW per year for Idaho, from NREL PVWatts v8 for the state's largest city at a 20 degree south-facing tilt (via TheGreenWatt, as of 2026-11). The darkest month averages 2.1 peak sun hours a day, which matters if you plan to go off-grid or size a battery. A different roof angle or heavy shade changes this, so treat it as a starting point.

Incentives

The 30% federal tax credit ended for homeowner purchases after December 31, 2025, so none is applied here. See the tax credit guide. Look up Idaho and your own utility for net metering terms and any local programs before relying on a payback number.

Planning estimate. Permits, interconnection approval and a licensed electrician are required for grid-tied systems.

Questions