Electricity in Casper, Wyoming
2 electric utilities serve homes in Natrona County, where Casper is: Rocky Mountain Power and High Plains Power. The name of your utility is on your bill. In 2025, the average home bill of these utilities was $107.47 (Rocky Mountain Power) to $134.87 (High Plains Power) a month. The Wyoming average was $111.59.
- 58,771 people (2025 estimate)
- Natrona County
- EIA data, 2025
Electric utilities in Casper
EIA lists utilities by county, not by city. These utilities serve homes in Natrona County. Your address has one utility: its name is on your bill, or type your ZIP code in the utility finder.
| Utility | Homes in Wyoming | Average bill 2025 | 1,000 kWh now |
|---|---|---|---|
| Rocky Mountain PowerInvestor-owned utility · bill calculator | 118,517 | $107.47710 kWh, 15.1¢ | $139.39 |
| High Plains PowerElectric cooperative | 12,868 | $134.87947 kWh, 14.2¢ | — |
1 smaller utility with fewer than 1,000 homes is also listed in the county. The average bill is the 2025 average of each utility's homes that bought their power from it (EIA-861); a dash means that its homes buy power from a retail supplier. The 1,000 kWh bill is from the official tariff, before taxes, for the utilities that have a calculator on this site. The Wyoming average was $111.59 a month for 835 kWh (13.4¢ per kWh).
Solar power in Casper
A home solar system on a south-facing roof in Casper makes about 1,517 kWh a year for each kW of panels (PVWatts, National Laboratory of the Rockies). A 6 kW system makes about 9,100 kWh a year. See what that saves on your utility's rates with the solar savings calculator.
Lower your electric bill in Casper
- Open your utility above for its average bill, outages and rates, or the bill calculator to check your own bill.
- Help paying your Rocky Mountain Power bill: 4 programs, with who qualifies and how to apply.
- Help paying the electric bill in Wyoming: bill assistance, payment plans and discounts.
- Why is my electric bill so high? and the appliance cost calculator.
More about Wyoming: Wyoming electric rates and all Wyoming utilities, business electricity rates and natural gas bills. Other cities: Cheyenne, Gillette, Laramie.
Who provides electricity in Casper, WY?
2 electric utilities serve homes in Natrona County, where Casper is: Rocky Mountain Power and High Plains Power. The name of your utility is on your bill.
What is the average electric bill in Casper, WY?
In 2025, the average home bill of these utilities was $107.47 (Rocky Mountain Power) to $134.87 (High Plains Power) a month. The Wyoming average was $111.59 a month for 835 kWh. Your bill depends on your kWh and your rate plan.
utilityratecalc.com is not part of any utility or city government. Sources: Census Bureau city population estimates, Vintage 2025 (the city and its counties); EIA-861 data, 2025 (utilities by county, homes and average bills).