18.86¢
per kWh, 2025
[ San Isabel Electric Assn / CO ]
San Isabel Electric Assn electricity rates in Colorado
CO-OP BOARD SETS RATES · DATA 2025
change in average rate, 2024→2025
+6.1%
vs 2024
23,415
residential customers
+18.0%
since 2020
What your bill becomes
Bill today
No change on file
Difference / month · / year
Estimated at San Isabel Electric Assn's average effective residential rate (18.86¢/kWh, EIA, all charges included). Your tariff, fees and taxes differ.
Rate history 2015–2025
| Year | ¢/kWh | Change | Customers |
|---|---|---|---|
| 2015 | 16.62¢ | — | 20,984 |
| 2016 | 16.46¢ | −1.0% | 21,144 |
| 2017 | 16.57¢ | +0.7% | 21,357 |
| 2018 | 16.41¢ | −1.0% | 21,572 |
| 2019 | 16.43¢ | +0.1% | 21,688 |
| 2020 | 15.98¢ | −2.7% | 22,028 |
| 2021 | 16.31¢ | +2.1% | 22,468 |
| 2022 | 16.35¢ | +0.3% | 22,826 |
| 2023 | 17.06¢ | +4.3% | 23,079 |
| 2024 | 17.78¢ | +4.2% | 23,289 |
| 2025 | 18.86¢ | +6.1% | 23,415 |
How this compares
15.69¢
Colorado average, 2025
+20.2%
San Isabel Electric Assn vs CO 2025 average
+9.5%
vs US 2025 average
#4
priciest in CO
Serves 7 counties in Colorado: Costilla, Custer, Fremont, Huerfano, Las Animas, Otero, Pueblo. 32 ZIP codes.
What the numbers show
Since 2015, San Isabel Electric Assn's average residential rate has gone from 16.62¢ to 18.86¢ per kWh: +13.5% over 10 years, or about +1.3% a year. It rose in 7 of the 10 years we can compare, and the biggest one-year increase was +6.1% in 2025. The largest drop was −2.7% in 2020.
For a home using 658 kWh a month, the Colorado average, San Isabel Electric Assn's 2025 rate works out to about $1,489 a year, $250 more than at Colorado's average rate of 15.69¢. Of the 33 Colorado utilities in our data with a 2025 price, it is the 4th most expensive.
San Isabel Electric Assn served 20,984 homes in 2015 and 23,415 in 2025 (+11.6%), under 1% of Colorado's residential electricity customers.
Who sets San Isabel Electric Assn's rates
San Isabel Electric Assn is a member-owned electric cooperative. A board elected by its members sets its rates. In some states the Colorado Public Utilities Commission also reviews co-op rates, but most co-op rate changes do not go through a commission rate case, so watch the co-op's own member notices and board meetings.
Commission contact: Colorado Public Utilities Commission. How we calculate every figure on this page: methodology.
Questions
Is San Isabel Electric Assn raising rates in 2026?
San Isabel Electric Assn's rates are set by its member-elected board, not through a rate case at the Colorado Public Utilities Commission, so check its own notices for a change this year. Its average residential rate moved +6.1% from 2024 to 2025.
What does San Isabel Electric Assn charge per kWh?
San Isabel Electric Assn's average effective residential rate was 18.86¢ per kWh in 2025 (EIA-861, revenue divided by sales, all charges included). Colorado's 2025 average was 15.69¢.
How much have San Isabel Electric Assn rates gone up in five years?
+18.0% between 2020 and 2025, against +27.0% for Colorado as a whole over the latest five-year window.
How many customers does San Isabel Electric Assn have in Colorado?
23,415 residential customers in 2025, across 7 counties including Costilla, Custer, Fremont, 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, which every US utility files. Nothing here is a utility bill; use it to understand the direction and size of changes.
Sources
- 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)