What is the PJM capacity charge in Illinois?
3,727,675 of 5,233,221 homes (71%) sit in 1 mapped utility; the main zone is Commonwealth Edison. Commonwealth Edison is the largest at 100% of mapped homes.
Illinois utilities and their PJM zones
| Utility | Zone | Illinois homes | Share | Illinois kWh/mo | 1 kW cents/kWh 2026/27 | 2024/25 $ | 2026/27 $ |
|---|---|---|---|---|---|---|---|
| Commonwealth Edison | COMED | 3,727,675 | 100.0% | 583 | 1.72 | $28.92 | $329.17 |
COMED against the RTO price
2021/22: $195.55 here, $140.00 RTO-wide; 2022/23: $68.96 here, $50.00 RTO-wide.
Illinois per kWh
COMED zone, Illinois: 1 kW at $329.17 x 365 / 1,000 = $120.15 a year, against $10.56 for 2024/25.
Illinois homes average 654 kWh a month (EIA-861, 2024). 1 kW per kWh: 0.13 cents at 2024/25, 1.53 at 2026/27. Illinois average price 2025: 17.69 cents.
24 Illinois utilities serve 1,505,546 homes outside our map. Largest: Ameren Illinois Company, investor-owned, 1,060,894 homes, 15.3 cents; MidAmerican Energy Co, investor-owned, 73,582 homes, 10.0 cents; City of Springfield - (IL), municipal, 59,621 homes, 12.0 cents; City of Naperville - (IL), municipal, 56,117 homes, 13.0 cents.
investor-owned 93% of homes at 15.1 cents and 626 kWh a month; cooperative 4% of homes at 15.9 cents and 1,036 kWh a month; municipal 3% of homes at 12.7 cents and 769 kWh a month. Of 102 counties, 64% are nonmetro.
Illinois against other PJM states
Illinois is #1 of 10 on the price ratio, the steepest and ahead of Kentucky (11.4x).
Neighbors with a page: Kentucky 11.4x.
Work out a Illinois capacity cost
- Loading Illinois prices.
More
Sources
1 Illinois utilities from EIA-861 2024 and the PJM files listed on the hub.
Questions
Which PJM zone is my Illinois utility in?
Commonwealth Edison: COMED.
How many Illinois homes does the zone map cover?
3,727,675 of 5,233,221 (71%); 1,505,546 are served by utilities we leave unmapped.