Solar Panels in Great Falls, MT: Cost, Payback & Savings
A typical 8.0 kW home solar system in Great Falls costs about $28,800 and pays for itself in about 16.5 years, saving roughly $18,809 over 25 years at Montana's average electricity price of 14.0¢/kWh.
Monthly solar production in Great Falls
Estimated output of a 8.0 kW south-facing roof system. Jul is the strongest month (1,373 kWh); Dec the weakest (430 kWh).
Solar production (kWh) Typical home use, 852 kWh/month
Solar payback calculator for Great Falls
Pre-filled with Great Falls's sunshine and Montana's average electricity price. Enter your own bill and an installer's price per watt to see your payback.
Leave export credit blank where the utility offers full net metering. Where exports earn less, solar used at home as it's produced is worth the full price and the rest earns the export credit.
How Great Falls compares
- Each kW of panels here produces about 1,334 kWh a year — about the same as the Montana median and 3% less than the US median city (1,371 kWh).
- Payback ranks #6 of 20 Montana places we cover.
- Sunshine varies little across a state; electricity price, installed cost and how utilities credit exported power drive most of the difference between states.
Net metering, tax credits and incentives in 2026
Montana offers net metering: power you send to the grid is credited at or near the retail price, so every solar kWh is valued at 14.0¢ here.
There is no federal tax credit for buying home solar installed in 2026. The 30% Residential Clean Energy Credit (Section 25D) ended for systems placed in service after December 31, 2025, so the costs and paybacks on this page include no federal credit.
Montana and local utilities may still offer rebates, performance payments, property-tax or sales-tax exemptions. Search the DSIRE incentives database for Montana and ask installers which programs they apply for you.
Frequently asked questions
Is solar worth it in Great Falls, MT?
For a typical home, a solar system pays for itself in about 16.5 years and then keeps saving money. Over 25 years the estimated net savings are $18,809. Verdict: slow payback. Your own payback depends on your roof, your bill and the quotes you get.
How many solar panels do I need in Great Falls, MT?
A home using 852 kWh a month (the Montana average) needs about 20 panels of 400 W — a 8.0 kW system — to cover its annual use. Divide your own yearly kWh by 1,334 to get the kW you need.
How much do solar panels cost in Great Falls, MT?
At 3.60 dollars per watt, a 8.0 kW system costs about $28,800 before any state or utility incentives. There is no federal tax credit for systems installed in 2026.
How much sun does Great Falls get?
Great Falls averages 4.7 peak sun hours per day, so each kilowatt of panels produces about 1,334 kWh a year.
Does Montana have net metering?
Yes. Power sent back to the grid is credited at or near the retail price (14.0¢ per kWh on average).
How much does electricity cost in Montana?
Residential electricity in Montana averages 14.0¢ per kWh, and a typical home uses 852 kWh a month (EIA).
Solar payback in nearby places
- Helena Valley Southeast16.6 yrs
- Helena Valley West Central16.6 yrs
- Helena16.6 yrs
- Lewistown17.0 yrs
- Havre16.9 yrs
- Butte16.8 yrs
- Belgrade16.8 yrs
- Anaconda16.7 yrs