How Montana compares
Montana had the 45th-highest residential average among the 50 states and Washington, D.C. At 900 kWh, its statewide average works out to $125.10, which is $44.37 lower than the national-average energy charge of $169.47.
Estimate an appliance in Montana
The calculator starts with 13.90¢/kWh. Use the energy rate from your bill when you have it.
This setup uses about 240 kWh in a 30-day month.
Please enter valid values within the ranges shown.
Solar Panel ROI Estimator
Enter your average monthly electric bill to see your potential solar savings.
Popular appliance costs
These examples use WattPocket's starting wattage and runtime plus Montana's April 2026 statewide average. Open any appliance to adjust the values.
| Appliance | Starting assumption | Monthly use | Monthly cost |
|---|---|---|---|
| Window Air Conditioner | 1,000 W × 8 hr/day | 240 kWh | $33.36 |
| Space Heater | 1,500 W × 5 hr/day | 225 kWh | $31.28 |
| Refrigerator | 150 W × 8 hr/day | 36 kWh | $5.00 |
| Electric Water Heater | 4,500 W × 3 hr/day | 405 kWh | $56.30 |
| Electric Clothes Dryer | 3,000 W × 0.75 hr/day | 67.5 kWh | $9.38 |
| Level 2 EV Charger | 7,200 W × 2.5 hr/day | 540 kWh | $75.06 |
The monthly cost formula
(watts ÷ 1,000) × hours per day × 30 × $0.1390/kWh
Watts are converted to kilowatts, multiplied by active hours and 30 days, then priced at the statewide residential average. Costs are calculated at full precision and rounded for display.