15.13¢
per kWh, 2025
[ Rocky Mountain Power Wyoming / WY · 20000-710-ER-26 ]
Rocky Mountain Power Wyoming: 8.5% requested for 118,517 Wyoming homes
PENDING · DECISION MAR 2027 · 150 DAYS
rate increase requested
16.42¢
per kWh if approved
150
days to decision
+40.2%
since 2020
What your bill becomes
Bill today
After the increase
Difference / month · / year
Estimated at Rocky Mountain Power Wyoming's average effective residential rate (15.13¢/kWh, EIA, all charges included). Your tariff, fees and taxes differ.
Rate case 20000-710-ER-26
Pending Docket 20000-710-ER-26 ↗
- May 2026Filed with the commission as docket 20000-710-ER-26
- Mar 2027Decision expected · 150 days
Rocky Mountain Power, PacifiCorp's Wyoming utility, asked the Wyoming Public Service Commission on May 12, 2026 for $70.5 million a year, an 8.8% overall increase, in two steps: $68.3 million (8.5%) on March 15, 2027 and a net $2.2 million (0.3%) on April 1, 2027 tied to the sale of its Washington service area. The commission's notice lists an 8.5% total increase for residential customers (Schedule 2). The company cites Wyoming's share of new capital investment, higher net power costs and operating costs ($58.3 million) plus $10 million for a wildfire liability self-insurance reserve, partly offset by a $7.8 million goodwill credit from the Washington sale. The company says a separate fuel-cost filing proposing an average 6% bill decrease from July 1, 2026 would bring the combined residential effect to about 3.9%. The case is pending; the commission scheduled public comment hearings for September 24 and 28, 2026, and the requested first-step effective date is March 15, 2027.
Rate history 2015–2025
| Year | ¢/kWh | Change | Customers |
|---|---|---|---|
| 2015 | 11.25¢ | — | 113,881 |
| 2016 | 11.44¢ | +1.7% | 114,386 |
| 2017 | 11.34¢ | −0.9% | 114,727 |
| 2018 | 11.05¢ | −2.6% | 115,073 |
| 2019 | 10.84¢ | −1.9% | 115,407 |
| 2020 | 10.79¢ | −0.5% | 115,995 |
| 2021 | 10.73¢ | −0.6% | 116,512 |
| 2022 | 10.84¢ | +1.0% | 117,245 |
| 2023 | 11.26¢ | +3.9% | 117,758 |
| 2024 | 13.44¢ | +19.4% | 118,130 |
| 2025 | 15.13¢ | +12.6% | 118,517 |
How this compares
13.37¢
Wyoming average, 2025
+13.2%
Rocky Mountain Power Wyoming vs WY 2025 average
−12.2%
vs US 2025 average
#3
priciest in WY
Rocky Mountain Power Wyoming files with the EIA as PacifiCorp (utility ID 14354).
Serves 15 counties in Wyoming: Albany, Big Horn, Carbon, Converse, Fremont, Hot Springs, Johnson, Lincoln, Natrona, Park, Platte, Sublette, Sweetwater, Uinta, Washakie. 94 ZIP codes.
Questions
Is Rocky Mountain Power Wyoming raising rates?
Rocky Mountain Power Wyoming filed docket 20000-710-ER-26 with the Wyoming Public Service Commission in May 2026 asking for a 8.5% increase (average residential increase), about $70.5M a year. The commission is expected to decide by Mar 2027.
How much more would I pay Rocky Mountain Power Wyoming each month?
At Wyoming's average use of 835 kWh, a bill of about $126.34 would become about $137.08 if the full 8.5% is approved. Commissions usually approve less than the request.
What does Rocky Mountain Power Wyoming charge per kWh?
Rocky Mountain Power Wyoming's average effective residential rate was 15.13¢ per kWh in 2025 (EIA-861, revenue divided by sales, all charges included). Wyoming's 2025 average was 13.37¢.
How much have Rocky Mountain Power Wyoming rates gone up in five years?
+40.2% between 2020 and 2025, against +22.8% for Wyoming as a whole over the latest five-year window.
How many customers does Rocky Mountain Power Wyoming have in Wyoming?
118,517 residential customers in 2025, across 15 counties including Albany, Big Horn, Carbon, according to the EIA-861 survey.
Where do these numbers come from?
Rates and customer counts are from the US Energy Information Administration's annual EIA-861 survey; rate-case facts are from the Wyoming Public Service Commission docket linked on this page. Nothing here is a utility bill; use it to understand the direction and size of changes.
Sources
Last verified 2026-10-16
- Wyoming Public Service Commission: public notice of RMP's application, Docket 20000-710-ER-26 (May 18, 2026) checked 2026-10-16
- Wyoming Public Service Commission: Hot Topics page listing Docket 20000-710-ER-26, Record No. 18134 checked 2026-10-16
- Rocky Mountain Power: application to the Wyoming PSC (May 12, 2026), hosted by WyoFile checked 2026-10-16
- Wyoming Public Service Commission: notice of public comment hearings (Aug. 24, 2026) checked 2026-10-16
- Cowboy State Daily: Rocky Mountain Power says 8.8% rate hike request not because of data centers checked 2026-10-16
- WyoFile: Another electric rate hike in Wyoming? Rocky Mountain Power asks for $71M increase checked 2026-10-16
- EIA-861 Sales to Ultimate Customers, 2015–2025 (released 2026-10-07)
- EIA-861M monthly state averages through Jul 2026
- NREL utility-by-ZIP lookup (2024)