Rocky Mountain Power in Wyoming: rates and bills
Rocky Mountain Power's 118,517 residential customers in Wyoming paid an average of 15.13¢ per kWh in 2025, for an average bill of $107.47 a month on 710 kWh.1 Over the last 12 months (Sep 2025–Aug 2026) the average was 15.60¢, and 14.34¢ in August 2026.2
EIA-861 2025 final (released October 7, 2026) and EIA's monthly utility survey through August 2026 (preliminary); next monthly update expected November 24, 2026. Averages are revenue divided by kWh, all charges included: not the rate printed in a tariff.
15 of 23 Wyoming counties served (EIA-861 2025)
Rocky Mountain Power's Wyoming homes paid an average of 15.13¢ per kWh in 2025, 12.6% more than in 2024 and 13.2% above the Wyoming average. Wyoming as a whole ranked 15th lowest4 among the states, but this utility's customers paid close to the median average of large US utilities (15.07¢ per kWh). Bills stay modest because use is low: the average home used 710 kWh1 a month, well below the Wyoming average of 835 kWh7.
The price per kWh, and how it compares
Rocky Mountain Power is the name PacifiCorp, an investor-owned utility, uses in Wyoming. Its lines served 118,517 homes in 2025, 47.0% of the state's residential customers, more than any other Wyoming utility. Those homes paid an average of 15.13¢ per kWh1 that year. Over the 12 months September 2025 to August 2026, EIA's monthly survey puts the average at 15.60¢ per kWh (2026 months preliminary), and for August 20263 alone at 14.34¢ per kWh2.
Each figure is average revenue per kWh: everything residential customers were billed, the basic charge, energy charges and adjustment riders, divided by the kWh they used. Most taxes are left out. It is not a line in the tariff, and no single household pays exactly this: a home that uses little pays more per kWh, because the fixed charge is spread over fewer kWh.
Set against other averages for 2025, Rocky Mountain Power stands closer to the national middle than to the rest of Wyoming:
| Comparison, 2025 | Average residential price |
|---|---|
| Rocky Mountain Power, Wyoming | 15.13¢ |
| All Wyoming utilities | 13.37¢4 |
| Median of US utilities with 100,000+ homes | 15.07¢ per kWh |
| US investor-owned utilities | 17.78¢ per kWh1 |
Nationally it ranked 88th highest of 177 among utilities with 100,000 or more residential customers, and it was 14.9% below the national average for investor-owned utilities. Within Wyoming it was the 2nd highest of the 71 utilities with 10,000 or more homes.
From 2024 to 2026: a higher price on less use
The residential average rose from 13.44¢ per kWh in 2024 to 15.13¢ per kWh in 2025 (+12.6%), faster than the Wyoming all-utility average, which rose 7.2%4. The bill grew less, from $99.36 to $107.47 (+8.2%), because use per home fell from 739 kWh5 to 710 kWh1 a month.
EIA's monthly data carry the series into 2026. The 12-month average to August 2026, 15.60¢ per kWh, is above the calendar 2025 figure, while August 20263 came in at 14.34¢ per kWh, −4.7%2 against August 2025. The 2026 months in both are preliminary and EIA revises them with its final annual survey; a single month also moves with use, as the season section below shows.
Source: EIA-861M monthly sales and revenue by utility; EIA, Electric Power Monthly / EIA-861M sales and revenue by state. Residential revenue divided by kWh in each month, as reported to EIA's monthly survey (EIA-861M; months since January 2026 preliminary).
Show the numbers
| Month | Rocky Mountain Power (¢/kWh) | kWh per customer | Bill per customer |
|---|---|---|---|
| January 2025 | 13.34¢ | 992 | $132.24 |
| February 2025 | 13.45¢ | 829 | $111.48 |
| March 2025 | 14.41¢ | 714 | $102.85 |
| April 2025 | 15.03¢ | 643 | $96.71 |
| May 2025 | 15.39¢ | 574 | $88.41 |
| June 2025 | 16.74¢ | 654 | $109.45 |
| July 2025 | 15.79¢ | 790 | $124.79 |
| August 2025 | 15.05¢ | 709 | $106.68 |
| September 2025 | 16.64¢ | 545 | $90.68 |
| October 2025 | 17.65¢ | 595 | $105.06 |
| November 2025 | 15.65¢ | 700 | $109.50 |
| December 2025 | 14.33¢ | 780 | $111.74 |
| January 2026 | 14.98¢ | 874 | $131.01 |
| February 2026 | 15.50¢ | 696 | $107.80 |
| March 2026 | 16.16¢ | 646 | $104.43 |
| April 2026 | 16.99¢ | 588 | $99.82 |
| May 2026 | 16.44¢ | 585 | $96.13 |
| June 2026 | 16.02¢ | 622 | $99.59 |
| July 2026 | 14.29¢ | 897 | $128.20 |
| August 2026 | 14.34¢ | 753 | $108.01 |
The data show the change, not its reason. Rocky Mountain Power's Wyoming rates are set by the Wyoming Public Service Commission, which the state legislature created to regulate monopoly public utilities serving Wyoming consumers. Its dockets hold the utility's rate cases and the adjustment filings that change bills during the year; the guide to electric rate increases explains how those decisions reach a bill.
Wyoming's other large utilities
The 7 Wyoming utilities with 10,000 or more residential customers span 10.33¢ per kWh in 2025: from Lower Valley Energy's 6.99¢ per kWh to Cheyenne Light Fuel & Power's 17.32¢ per kWh. Cheyenne Light, Fuel & Power, the second-largest by homes served with 17.5%1 of the state's residential customers, is investor-owned like Rocky Mountain Power, and the two had the highest averages. Montana-Dakota Utilities, also investor-owned, the cooperatives Lower Valley Energy, Powder River Energy and High Plains Power, and the City of Gillette's municipal utility all averaged less.
Source: EIA-861 annual electric power industry report, 2025 final. EIA-861 2025 final. Average revenue per kWh is all charges divided by kWh; it is not a tariff rate.
Show the numbers
| Utility | average residential price (bundled customers) |
|---|---|
| Lower Valley Energy (WY) | 6.99¢ |
| Montana-Dakota Utilities Co (WY) | 11.96¢ |
| Powder River Energy Corp (WY) | 12.20¢ |
| City of Gillette (WY) | 12.90¢ |
| High Plains Power (WY) | 14.24¢ |
| Rocky Mountain Power (WY) | 15.13¢ |
| Cheyenne Light Fuel & Power (WY) | 17.32¢ |
Grouped by ownership, the pattern holds across all of Wyoming's utilities, small ones included: cooperatives averaged 9.86¢ per kWh for residential service in 2025, public power 12.90¢ per kWh and investor-owned utilities 15.19¢ per kWh. Nationally the gap between cooperatives (14.10¢ per kWh) and investor-owned utilities (17.78¢ per kWh1) was narrower.
Source: EIA-861 annual electric power industry report, 2025 final. Bundled (full-service) residential revenue divided by kWh, summed over every utility of each type (EIA-861 2025). Small utilities filing the short form report no residential split and are not included.
Show the numbers
| Type | ¢/kWh | Residential customers |
|---|---|---|
| Investor-owned utilities | 15.19¢ | 180,060 |
| Electric cooperatives | 9.86¢ | 58,200 |
| Public power (municipal, districts, state) | 12.90¢ | 14,134 |
No Wyoming household can choose among them: 0.0%1 of the state's residential customers bought power from a competitive supplier in 2025. Rocky Mountain Power reports customers in 15 counties (Albany County, Big Horn County, Carbon County, Converse County, Fremont County, Hot Springs County, Johnson County, Lincoln County, Natrona County, Park County, Platte County, Sublette County and 3 others), and in all 156 at least one other utility also reports service. The county does not settle who serves a home; the utilities' own service maps decide by address.
Low use keeps the bill small
The average Rocky Mountain Power bill in Wyoming was $107.47 a month in 2025, below the Wyoming average of $111.59 even though the price per kWh was higher. The difference is consumption: 710 kWh1 a month per home, against 835 kWh7 across all Wyoming utilities. Over the 12 months September 2025 to August 2026 the bill averaged $107.67 on 690 kWh2 a month.
Source: EIA-861 annual electric power industry report, 2025 final. EIA-861 2025 final. Average revenue per kWh is all charges divided by kWh; it is not a tariff rate.
Show the numbers
| Utility | average monthly residential use |
|---|---|
| Cheyenne Light Fuel & Power (WY) | 526 |
| Rocky Mountain Power (WY) | 710 |
| Montana-Dakota Utilities Co (WY) | 845 |
| City of Gillette (WY) | 891 |
| High Plains Power (WY) | 947 |
| Powder River Energy Corp (WY) | 1,156 |
| Lower Valley Energy (WY) | 1,914 |
A summer peak and a winter one
Rocky Mountain Power is in EIA's monthly sample, so its season can be traced. Over September 2025 to August 2026, average use per home was highest in July 2026 at 897 kWh, with a bill of $128.20, and lowest in September 2025 at 545 kWh ($90.682). In this window the chart also shows a second high in midwinter, close to the summer one, with the lowest use in the spring and autumn months between. Wyoming is cold, with 7,808 heating degree days a year in NOAA's 2016–2025 normals (4th highest among the contiguous states) and only 2988 cooling degree days; in EIA's 2020 household survey, heating took 19% of Wyoming household electricity and air conditioning 8%9.
Source: EIA-861M monthly sales and revenue by utility. kWh per residential customer in each month (EIA-861M; months since January 2026 preliminary). The table adds the average bill and price for the month.
Show the numbers
| Month | kWh per customer | Bill per customer | ¢/kWh |
|---|---|---|---|
| September 2025 | 545 | $90.68 | 16.64¢ |
| October 2025 | 595 | $105.06 | 17.65¢ |
| November 2025 | 700 | $109.50 | 15.65¢ |
| December 2025 | 780 | $111.74 | 14.33¢ |
| January 2026 | 874 | $131.01 | 14.98¢ |
| February 2026 | 696 | $107.80 | 15.50¢ |
| March 2026 | 646 | $104.43 | 16.16¢ |
| April 2026 | 588 | $99.82 | 16.99¢ |
| May 2026 | 585 | $96.13 | 16.44¢ |
| June 2026 | 622 | $99.59 | 16.02¢ |
| July 2026 | 897 | $128.20 | 14.29¢ |
| August 2026 | 753 | $108.01 | 14.34¢ |
The monthly average price tends to move the other way. In low-use months the fixed monthly charge is spread over fewer kWh, so the average per kWh rises; in high-use months it falls. That is one reason a single month is a poor guide to the year, and why the comparisons on this page use annual or 12-month figures.
Same company, four states
PacifiCorp has pages here for 4 state utilities, and each state's commission sets its own rates. In 2025 Wyoming's average of 15.13¢ per kWh was just below that of Pacific Power (Oregon) (15.18¢ per kWh), the highest of the four, and well above Rocky Mountain Power in Utah (13.52¢ per kWh), the lowest. Pacific Power in Washington averaged 14.33¢ per kWh1. The PacifiCorp page compares all four.
Source: EIA-861 annual electric power industry report, 2025 final. EIA-861 2025 final. Average revenue per kWh is all charges divided by kWh; it is not a tariff rate.
Show the numbers
| Utility | average residential price (bundled customers) |
|---|---|
| Rocky Mountain Power (UT) | 13.52¢ |
| Pacific Power (WA) | 14.33¢ |
| Rocky Mountain Power (WY) | 15.13¢ |
| Pacific Power (OR) | 15.18¢ |
Meters, time-of-use and rooftop solar
EIA's 2025 meter count recorded 0.0% of Rocky Mountain Power's Wyoming residential meters as advanced meters, against 97.6% for the same company in Utah and 40.4% across Wyoming. Time-based pricing was almost unused: 47 homes were enrolled in a time-of-use rate, against 11.3%10 of homes nationally on time-varying rates. The option's hours and prices are in the utility's Wyoming rate schedules; the time-of-use guide shows how such a plan changes a bill.
Rooftop solar is also uncommon: 1,218 net-metered residential installations with 9.6 megawatts of capacity, or 10.3 per 1,000 residential customers, against 12.1 for Wyoming and 38.110 nationally. The net metering guide explains how exported power is credited.
Outages
Measured under IEEE 1366, Rocky Mountain Power's Wyoming customers averaged 195 minutes without power in 2025 including major events, fewer than the Wyoming average of 262 minutes. Excluding major event days the figure was 91 minutes (Wyoming: 120 minutes), and customers had 1.37 interruptions on average, against 1.7311 statewide.
Businesses, and help with bills
Business customers paid less per kWh than homes in 2025: 24,085 commercial accounts averaged 11.75¢ per kWh, with a monthly bill of $573.07 (Wyoming: $745.837), and 2,658 industrial accounts 8.53¢ per kWh. Industrial sales are large enough to pull the average across all 145,260 customers down to 9.85¢ per kWh1.
Households that need help with heating-season bills can apply for energy assistance; Wyoming received $11.1 million12 in federal LIHEAP funds for fiscal year 2026. For generation, prices and bills across the state, see electricity in Wyoming.
Source: EIA-861 2025, service territory; Census Bureau, Cartographic boundary file, counties. EIA-861 2025 service territory: 15 counties. Counts whole counties even where the utility serves only part of one; check the utility's own service-area map for an address.
Show the numbers
| County | Other utilities reporting service |
|---|---|
| Albany County | Cheyenne Light Fuel & Power, Carbon Power & Light, High West Energy, Wheatland Rural Electric Association, WAPA-- Western Area Power Administration |
| Big Horn County | High Plains Power, Big Horn Rural Electric Co, Garland Light & Power Company, Town of Basin, City of Deaver, WAPA-- Western Area Power Administration |
| Carbon County | High Plains Power, Carbon Power & Light, Yampa Valley Electric Association, WAPA-- Western Area Power Administration |
| Converse County | Niobrara Electric Association, WAPA-- Western Area Power Administration |
| Fremont County | High Plains Power, Midvale Irrigation District, WAPA-- Western Area Power Administration |
| Hot Springs County | High Plains Power, WAPA-- Western Area Power Administration |
| Johnson County | Powder River Energy Corp, Montana-Dakota Utilities Co, High Plains Power, Big Horn Rural Electric Co |
| Lincoln County | Lower Valley Energy, Bridger Valley Electric Association, WAPA-- Western Area Power Administration |
| Natrona County | High Plains Power, WAPA-- Western Area Power Administration |
| Park County | High Plains Power, City of Cody, Big Horn Rural Electric Co, City of Powell, Garland Light & Power Company, Beartooth Electric Cooperative, NorthWestern Energy, Willwood Light & Power Company, WAPA-- Western Area Power Administration |
| Platte County | Wyrulec Company, Wheatland Rural Electric Association, Niobrara Electric Association, Town of Wheatland, Town of Guernsey, WAPA-- Western Area Power Administration |
| Sublette County | Lower Valley Energy |
| Sweetwater County | Bridger Valley Electric Association, WAPA-- Western Area Power Administration |
| Uinta County | Bridger Valley Electric Association |
| Washakie County | High Plains Power, Big Horn Rural Electric Co, WAPA-- Western Area Power Administration |
Rocky Mountain Power in Wyoming: common questions
What does Rocky Mountain Power charge per kWh in Wyoming?
Averaged over all residential customers and all charges, 15.13¢ per kWh1 in calendar 2025 and 15.60¢ per kWh2 over the 12 months September 2025 to August 2026 (2026 months preliminary). These are average prices, total residential revenue divided by kWh, not the energy charge printed in the Wyoming residential rate schedule, which leaves out the basic charge and adjustment riders.
What is the average Rocky Mountain Power bill in Wyoming?
$107.47 a month in 2025 for 710 kWh1, and $107.67 averaged over September 2025 to August 2026. In EIA's monthly data the highest month was July 2026 ($128.20) and the lowest September 2025 ($90.682).
Did Rocky Mountain Power raise rates in Wyoming?
EIA records what customers paid, not tariff decisions. The residential average rose from 13.44¢ per kWh5 in 2024 to 15.13¢ per kWh1 in 2025, and the 12 months September 2025 to August 2026 averaged 15.60¢ per kWh; August 20263 alone came in at 14.34¢ per kWh, −4.7%2 against August 2025 (preliminary). Approved and pending rate changes are in the Wyoming Public Service Commission's dockets.
Is Rocky Mountain Power the same company as PacifiCorp?
Yes. Rocky Mountain Power is a brand of PacifiCorp, which also serves homes in Oregon, Utah, Washington (as Rocky Mountain Power in Utah and Pacific Power in Oregon and Washington). Each state's commission sets that state's rates, so averages differ: 15.13¢ per kWh in Wyoming and 13.52¢ per kWh1 in Utah in 2025.
Related pages
Sources
- EIA-861 annual electric power industry report, 2025 final; table Sales_Ult_Cust_2025; 2025, final; released October 7, 2026. www.eia.gov
- EIA-861M monthly sales and revenue by utility; table sales_ult_cust_2025 and _2026; released October 23, 2026. www.eia.gov
- EIA, Electric Power Monthly / EIA-861M sales and revenue by state; table sales_revenue.xlsx (EPM Table 5.6.A); January 2001 to 2026-08; months since January 2026 preliminary; released October 23, 2026. www.eia.gov
- EIA, Historical state data, annual sales, revenue and customers; table HS861 2010-.xlsx; 2010-2025, final; released October 7, 2026. www.eia.gov
- EIA-861 annual electric power industry report, 2024 final; table Sales_Ult_Cust_2024; 2024, final (file updated December 3, 2025); released December 3, 2025. www.eia.gov
- EIA-861 2025, service territory; table Service_Territory_2025; 2025, final; released October 7, 2026. www.eia.gov
- EIA-861 2025, average monthly bill by state; table Average_Bill_2025; 2025, final; released October 7, 2026. www.eia.gov
- NOAA, Climate Prediction Center population-weighted degree days by state; table daily state files, base 65°F; 2016-2025 annual sums; 1981-2010 CPC normals; released November 13, 2026. ftp.cpc.ncep.noaa.gov
- EIA, Residential Energy Consumption Survey 2020, state data; table CE4.1.EL.ST, CE5 state tables, state highlights; released June 28, 2023. www.eia.gov
- EIA-861 2025, advanced meters, dynamic pricing and net metering; table Advanced_Meters, Dynamic_Pricing, Net_Metering 2025; 2025, final; released October 7, 2026. www.eia.gov
- EIA-861 2025, reliability; table Reliability_2025; 2025, final; released October 7, 2026. www.eia.gov
- HHS, LIHEAP funding releases to states; table FY2027 first release; FY2026 final; FY2027 first release (October 9, 2026); FY2026 total; released October 9, 2026. acf.gov
- Census Bureau, Cartographic boundary file, counties; table cb_2025_us_county_5m; cb_2021_us_county_5m; 2025 (2021 for Connecticut). www.census.gov
How every figure is built: methodology. Found an error? Write to [email protected]; corrections are listed on the updates page.