What changes on ComEd bills in 2027?

On October 14, 2026, the Illinois Commerce Commission's administrative law judges issued a proposed order on ComEd's 2028–2031 grid plan. The Chicago Sun-Times reported that the judges did not find a proposed Lincoln Park substation needed at the size ComEd sought, and said ComEd planned more capacity than projected load growth supports. The five commissioners make the final decision.

Whatever the ICC approves sets up ComEd's next rate request, which ComEd expects to file in January 2027 to take effect in January 2028.

Not yet. The about $1.22 a month comes from two parts: about $1.09 from a $128 million refund of 2025 revenue and about $0.13 from ComEd's cost reconciliation. That reconciliation also seeks $234.3 million ComEd spent over budget in 2025, which the Citizens Utility Board plans to challenge. CUB expected the judges' proposed orders in early November and final rulings in December, so the ICC could order a bigger or smaller change.

The 2021 Climate and Equitable Jobs Act had the state buy carbon mitigation credits from Illinois nuclear plants for five years, from June 2022 through May 2027. On ComEd bills that shows up as the Carbon-Free Energy Resource Adjustment, a per-kWh line that's a credit when energy prices are high and was a charge in some earlier years.

Lately it has been a credit. Residential credits averaged about $13 a month in early 2026 and were expected to reach about $19 in April, and the Illinois Power Agency says more than $1.8 billion has been credited to ComEd customers since 2022. When the program ends in May 2027, that line goes away.

It's too early to say. The summer supply price is set from the Illinois Power Agency's spring power purchases and takes effect June 1. The grid capacity price, which drove the 2025 and 2026 increases, cleared at the $333.44 cap for June 2027 to May 2028, about 1.3% above the year before; the Citizens Utility Board says capacity is roughly 20% of supply costs.

For comparison, ComEd's summer 2026 supply price was 10.4¢ per kWh. See why ComEd bills are so high and are data centers raising Illinois electric bills?

PJM's auction for June 2028 to May 2029 cleared at its price cap of $325 per megawatt-day in every zone, about 2.5% below the year before, and still came up 6,831 megawatts short of PJM's reliability target. Without the cap, Enel reports PJM's own simulation would have put the ComEd zone at $777 per megawatt-day, so the cap is doing a lot of work.

Illinois' 2026 energy law adds batteries to the grid to push the other way: the Illinois Power Agency estimated it would cut average ComEd residential bills by $1.46 to $2.03 a month by 2031, mostly from battery storage. Home batteries enrolled in ComEd's virtual power plant are part of that. See ComEd and Ameren virtual power plants.

• Solar covers part of your own use at today's price for 25 years or more. See is solar worth it in Illinois?
• A battery can carry your home through ComEd's 1 to 7 p.m. peak on time-of-day rates, and ComEd pays about $300 per kWh toward one. See time-of-use rates.
• Check your supply plan against the Price to Compare before signing with an alternative supplier.

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