Solar payback in Montana
A 7.7 kW home solar system in Montana pays for itself in about 17.9 years at 2026 prices, with no federal tax credit. That ranks #35 of 51 states, where 1 is the fastest.
- Installed price
- $3.60/W
- national median, 2025
- Solar output
- 1,344 kWh
- per kW a year, Billings weather
- Electricity rate
- 14.99¢/kWh
- average home rate, EIA
- Value of a solar kWh
- 15.0¢
- full retail net metering
Pays back in year 18
- Cost up front
- $27,720
- Saved per year
- $1,551
- Ahead after 25 years
- $11,062
Payback by quoted price and roof direction
Find your installer's price per watt (total price divided by system watts) to read your payback in Montana. Nationally, cash buyers paid a median of $3.00 per watt in 2025 and loan buyers $4.50, because loan fees are often built into the price. East and west roofs make 16% and 19% less power than south here.
| Price per watt | 7.7 kW costs | South roof | East roof | West roof |
|---|---|---|---|---|
| $2.50 | $19,250 | 12.4 years | 14.8 years | 15.3 years |
| $3.00 | $23,100 | 14.9 years | 17.7 years | 18.3 years |
| $3.60 (national median) | $27,720 | 17.9 years | 21.3 years | 22.0 years |
| $4.00 | $30,800 | 19.9 years | 23.6 years | 24.4 years |
| $4.50 | $34,650 | 22.3 years | 26.6 years | 27.5 years |
System size barely changes payback here: a bigger system costs more and saves more in about the same proportion.
Questions about solar in Montana
How does Montana pay for solar power I send to the grid?
Montana is counted here as full retail net metering: each kWh you export earns the same as a kWh you would buy. We have not checked Montana's rules against its utility commission yet, and some utilities pay less, so check your utility's net metering tariff.
How much did the end of the federal tax credit change payback in Montana?
With the 30% credit that ended in 2025, the same system would have paid back in about 12.5 years instead of 17.9. The credit ended for systems installed after December 31, 2025. Leased systems and power purchase agreements can still pass on a business credit, but then you do not own the panels.
Is 1,344 kWh per kW a lot?
The range across states runs from about 922 kWh in Alaska to about 1,779 in the Southwest. Sunshine matters less than people expect: the electricity rate and how your utility credits exports move payback more.
States near Montana in the ranking
- South Dakota 16.6 years
- Mississippi 17.5 years
- Arkansas 17.8 years
- Arizona 18.3 years
- Nebraska 18.4 years
- West Virginia 18.5 years