Solar vs. Grid Electricity in Montana
Compare the 25-year cost of solar energy to staying on grid electricity, accounting for utility rate escalation, panel degradation, and IRA credits.
In Montana, the average homeowner pays $11.8¢/kWh for grid electricity. With historical escalation of 3-8% per year, this rate is projected to reach $31.5¢/kWh in 25 years (at 4% escalation). A 7 kW solar system locks in an effective rate of $0.152/kWh for the life of the system.
The math is straightforward: grid electricity costs more every year while solar LCOE stays fixed. By year 10, the utility rate reaches approximately $17.5¢/kWh, nearly 1.1x the solar LCOE. This growing gap is the engine that drives solar ROI.
25-Year Cost Comparison
| Metric | Solar | Grid Only |
|---|---|---|
| Effective rate (year 1) | $0.152/kWh | $11.8¢/kWh |
| Effective rate (year 25) | $0.152/kWh | $31.5¢/kWh |
| 25-year discounted cost | $31,433 | $24,409 |
| Net savings (NPV) | $3,189 | |
Solar in Montana produces 1,350 kWh per installed kW per year. A 7 kW system generates 9,450 kWh annually, offsetting 90% of the average household's 10,500 kWh annual consumption. After the 13-year payback period, every additional year of operation is pure savings.
Frequently Asked Questions
Is solar vs grid worth it in Montana?
What incentives are available for solar vs grid in Montana?
How long does solar vs grid take to pay back in Montana?
Other Comparisons for Montana
Run Your Montana Analysis
Get a personalized 25-year NPV with Monte Carlo confidence intervals, IRA credit stacking, and optimal electrification sequencing.
Calculate My ROI ›