Electricity rates — Intermountain Rural Elec Assn
A household served by Intermountain Rural Elec Assn using 1,000 kWh a month pays about $1,577.13 a year on the cheapest of 1 generally available plan — Residential Service (A) from Intermountain Rural Elec Assn, in effect since March 2024. Rates checked September 23, 2026. A further 7 older schedules are listed further down with their year, but not ranked.
Every priced plan, 1,000 kWh/mo
| Plan | Per year | vs cheapest | Effective |
|---|---|---|---|
| Residential Time of Use Demand Metered (C-TOU)demand charge · in effect since May 2017 · older schedule, not ranked | $1,057.48 | −$519.65 | 8.8¢ |
| Residential Incorporated City or Town Service Demand Metered (CSD)demand charge · in effect since May 2017 · older schedule, not ranked | $1,069.12 | −$508.01 | 8.9¢ |
| Residential Incorporated City or Town Demand Metered Time of Use (CSD-TOU)demand charge · in effect since May 2017 · older schedule, not ranked | $1,129.12 | −$448.01 | 9.4¢ |
| Residential Demand Metered (C)demand charge · in effect since May 2017 · older schedule, not ranked | $1,141.25 | −$435.88 | 9.5¢ |
| Residential Incorporated City or Town Service Time of Use (CS-TOU)time-of-use · in effect since May 2017 · older schedule, not ranked | $1,459.44 | −$117.69 | 12.2¢ |
| Residential Incorporated City or Town Service (CS)demand charge · in effect since September 2022 · older schedule, not ranked | $1,545.41 | −$31.72 | 12.9¢ |
| Residential Time of Use (A-TOU)time-of-use · in effect since May 2017 · older schedule, not ranked | $1,567.32 | −$9.81 | 13.1¢ |
| Residential Service (A)✓ cheapestdemand charge · in effect since March 2024 | $1,577.13 | — | 13.1¢ |
Cost across usage levels
The cheapest plan at each consumption level, showing whether the ranking holds as usage changes.
- 500 kWh/mo — cheapest $895.13 (Residential Service (A)), dearest $895.13
- 1,000 kWh/mo — cheapest $1,577.13 (Residential Service (A)), dearest $1,577.13
- 2,000 kWh/mo — cheapest $2,941.15 (Residential Service (A)), dearest $2,941.15
What a typical bill costs
At 1,000 kWh a month one plan here is open to any household — Residential Service (A), at $1,577.13 a year. There is no cheaper option to move to, only the restricted schedules priced below.
Effective rates, bill divided by kilowatt-hours, come to 13.1¢ per kWh at that usage.
What Intermountain Rural Elec Assn's customers were billed in 2024
At 864 kWh a month, Intermountain Rural Elec Assn's median open plan comes to 13.4¢ per kWh, 11% below the 15.0¢ its customers were billed in 2024, riders included. Rates set since 2024 account for some of that.
| Ownership, as EIA classes it | Cooperative |
|---|---|
| Full-service homes in Colorado | 165,067 |
| Share of Colorado's households | 7% |
| Average use per home | 864 kWh a month |
| Average bill per home | $129.93 a month |
| Billed per kWh, riders included | 15.0¢ |
| Median open plan here, at that use | 13.4¢ |
CORE Electric Cooperative in U.S. Energy Information Administration, Form EIA-861, 2024 (Sales_Ult_Cust_2024.xlsx), retrieved September 23, 2026.
How it compares
Among the 109 utilities indexed, Intermountain Rural Elec Assn's cheapest open plan is the 49th-lowest, 4% less than their median of $1,649.16. It sits between Arizona Public Service Co ($1,572.70) and Jacksonville Electric Authority ($1,596.72).
In Colorado it is the 2nd-dearest of the 4 utilities indexed; Public Service Co of Colorado starts lowest, at $956.00.
None of Intermountain Rural Elec Assn's plans open to any household has a tiered step or a seasonal price in this data: a kWh costs the same however much is used and whatever the month.
How the answer changes with usage
Residential Service (A) is cheapest at every level tested — $895.13 a year at 500 kWh a month, $2,941.15 at 2,000 kWh.
6 plans on file, at 1,000 kWh a month
Residential Time of Use Demand Metered (C-TOU) — $1,057.48 a year, 8.8¢ per kWh effective, demand-charged. It carries a $15.00 monthly standing charge. In effect since May 2017. Too old to quote as a current price.
Residential Incorporated City or Town Service Demand Metered (CSD) — $1,069.12 a year, 8.9¢ per kWh effective, demand-charged. It carries a $10.00 monthly standing charge. In effect since May 2017. Too old to quote as a current price.
Residential Incorporated City or Town Demand Metered Time of Use (CSD-TOU) — $1,129.12 a year, 9.4¢ per kWh effective, demand-charged. It carries a $15.00 monthly standing charge. In effect since May 2017. Too old to quote as a current price.
Residential Demand Metered (C) — $1,141.25 a year, 9.5¢ per kWh effective, demand-charged. It carries a $10.00 monthly standing charge. In effect since May 2017. Too old to quote as a current price.
Residential Incorporated City or Town Service Time of Use (CS-TOU) — $1,459.44 a year, 12.2¢ per kWh effective, time-of-use. It carries a $15.00 monthly standing charge. In effect since May 2017. Too old to quote as a current price.
Residential Incorporated City or Town Service (CS) — $1,545.41 a year, 12.9¢ per kWh effective, demand-charged. It carries a $13.50 monthly standing charge. In effect since September 2022. Too old to quote as a current price.
How these plans are structured
Of 8 priceable plans: 2 time-of-use, 6 with demand charges.
Fixed monthly charges run from $10.00 to $17.75.
Who provides these plans
EIA-861 lists Intermountain Rural Elec Assn serving homes in Colorado and in no other state, which is how its plans are placed there. 8 of its 8 published residential schedules can be priced.
What this does not cover
2 of these plans price by the hour, so their figures are marked lower confidence.
New to these terms? The methodology page explains tiered bands, time-of-use periods and fixed charges, and sets out exactly what the rate engine assumes.
Estimate — your actual bill may differ.
Tariff structures from NREL/OpenEI Utility Rate Database (CC0 1.0), retrieved September 23, 2026.