Solar panels in Great Falls, MT
Roofs in Great Falls get about 1,585 hours of usable sunlight a year — more than 56% of the cities we've measured. Here's what that means in cost, savings and payback, using real rooftop data rather than a national average.
Check your specific roof in Great Falls → City averages are a starting point; your own roof's size, pitch and shading change the answer a lot.
What a typical Great Falls solar system costs
A 21-panel system (8.4 kW) is about right for an average Great Falls home using 10,800 kWh a year. It would produce roughly 11,317 kWh annually and offset 100% of that usage.
| System | Size | kWh/yr | Net cost | Saves/yr | Payback |
|---|---|---|---|---|---|
| 8 panels | 3.2 kW | 4,311 | $6,384 | $522 | 12.2 yrs |
| 12 panels | 4.8 kW | 6,467 | $9,576 | $782 | 12.2 yrs |
| 16 panels | 6.4 kW | 8,622 | $12,768 | $1,043 | 12.2 yrs |
| 20 panels | 8 kW | 10,778 | $15,960 | $1,304 | 12.2 yrs |
| 26 panels | 10.4 kW | 14,011 | $20,748 | $1,404 | 14.8 yrs |
Notice that payback barely improves as systems get bigger, and eventually gets worse. That's because you can only save money on electricity you were going to buy anyway. Once a system covers your usage, extra panels mostly generate exports at a much lower rate.
Why Great Falls gets 1,585 sun hours
That figure comes from Google's analysis of real rooftops across Great Falls — it already accounts for shading from trees, chimneys and neighbouring buildings, which is why it's lower than the raw "hours of daylight" figures you'll see elsewhere. An unusually open, unshaded roof in Great Falls reaches about 1,611 hours, roughly 2% better than typical.
The numbers behind this page
| Typical usable sunlight | 1,585 hrs/yr |
|---|---|
| Unshaded roof | 1,611 hrs/yr |
| Electricity rate (Montana avg) | 12.1¢/kWh |
| Installed cost assumed | $2.85/W |
| Panel size assumed | 400 W |
| Federal tax credit | 30% |
| Typical household usage | 10,800 kWh/yr |
| Power used as generated | 33% |
| Paid for exported power | full retail (net metering) |
| Rooftops sampled here | 10 |
| Google imagery from | 2012 |
Nearby cities
See all of Montana → statewide sunlight, rates, incentives and every city we've measured.
Great Falls solar questions
How many solar panels do I need in Great Falls?
About 21 panels for an average home. Great Falls roofs get 1,585 usable sun hours a year, so each 400W panel produces roughly 539 kWh annually.
Is solar worth it in Great Falls?
At 12.1¢/kWh and 1,585 sun hours, a typical system pays for itself in about 12.7 years and returns roughly $16,303 over 25 years. That is slower than the national average, so compare quotes carefully.
How much do solar panels cost in Great Falls?
A 8.4 kW system costs about $23,940 before incentives and $16,758 after the 30% federal tax credit. Prices vary by installer, roof complexity and equipment.
Worth reading before you buy
Estimates only, generated 2026-08-22 from Google Solar API rooftop samples and average Montana electricity rates. Not a quote and not financial advice. Your roof, usage, utility plan and local incentives will change these numbers — get real quotes before buying.