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Did Your Electric Rate Really Go Up Again? Every ComEd and Ameren Increase Since 2021, Dated
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Did Your Electric Rate Really Go Up Again? Every ComEd and Ameren Increase Since 2021, Dated

Ryan Cook••

"Did my rate go up again, or does it just feel like it?"

I get some version of that question every week, and I understand why nobody can answer it from memory. Illinois electric rates change through at least three separate doors — ICC rate cases, capacity auctions, and seasonal supply resets — and the news covers each one in isolation. So here's the whole ledger in one place: every meaningful ComEd and Ameren Illinois increase since 2021, with dates and docket numbers, so you can stop wondering whether you imagined it.

You didn't imagine it. By my estimate, a typical Ameren Illinois home paid around 8 cents per kWh all-in in 2021 and pays approximately 15.5 cents today; a typical ComEd home went from around 9 cents to approximately 17.07 cents.

The five-year scoreboard

Those all-in figures are estimates that blend supply, delivery and fixed charges for a typical home. They work out to roughly a 94 percent increase in Ameren territory and roughly 90 percent in ComEd territory in five years.

For a household using 1,000 kWh a month, that's the difference between an approximately $95 bill in 2021 and an approximately $170 bill today. I wrote up why rates nearly doubled if you want the market mechanics. This post is the timeline — what changed, and when.

The timeline at a glance

Date What changed Where it's on record
Dec. 19, 2024 ICC approves Ameren Illinois' multi-year delivery plan: about $308.6 million in increases spread through 2027 ICC Dockets 22-0487 / 24-0238
April 2025 MISO summer capacity price clears $666.50/MW-day, up from $30 the year before MISO 2025-26 Planning Resource Auction
June 1, 2025 ComEd Price to Compare 6.552¢ → 10.028¢; Ameren 8.277¢ → 12.180¢ Plug In Illinois historical prices
July 22, 2025 PJM 2026-27 capacity auction clears at the $329.17/MW-day cap (was $269.92; $28.92 two years earlier) PJM
Oct. 1, 2025 Ameren Price to Compare drops 12.180¢ → 8.402¢ (about 31 percent) Plug In Illinois; CUB
Dec. 17, 2025 PJM 2027-28 auction clears at a record $333.44/MW-day cap PJM
Dec. 18, 2025 ICC approves about $48.4 million (Ameren, Docket 25-0382) and about $243 million (ComEd, Docket 25-0383) in reconciliation delivery increases; on bills January 2026 ICC
Jan. 1, 2026 ComEd Price to Compare 9.660¢, 47 percent above January 2025; Ameren 8.769¢ Plug In Illinois
June 1, 2026 Summer Price to Compare: Ameren 11.326¢, ComEd 10.399¢, through Sept. 30, 2026 Plug In Illinois
Pending Ameren about $65.3 million (Docket 26-0214); ComEd about $234.3 million (Docket 26-0215); ICC rulings expected December 2026 ICC / CUB

The timeline, dated

December 19, 2024 — Ameren delivery increase approved. The Illinois Commerce Commission approved Ameren Illinois' refiled multi-year grid and rate plan for 2024 through 2027, an overall increase the ICC rounded to $309 million (widely reported as $308.6 million), spread through 2027. Delivery is the poles-and-wires half of your bill, and it doesn't reset with the seasons. Once it goes up, it stays up.

Spring 2025 — the capacity auctions blow out. MISO, the grid operator behind Ameren territory, saw its summer capacity price jump from $30 to $666.50 per megawatt-day for 2025-26 — a 22x increase in a single year. PJM, behind ComEd territory, had already cleared 2025-26 at $269.92 per megawatt-day, up from $28.92 the year before, and in July 2025 cleared 2026-27 at the $329.17 cap. Capacity costs ride into your supply price, which is why Ameren bills kept climbing even between rate cases.

June 1, 2025 — the supply price jump most people remember. This is the one that showed up on July bills. ComEd's Price to Compare went from 6.552 to 10.028 cents per kWh, about 53 percent; Ameren's went from 8.277 to 12.180 cents on the first 800 kWh, about 47 percent. Those capacity auction results had arrived.

October 1, 2025 — a rare drop. Ameren's supply price fell from 12.180 cents to 8.402 cents with the seasonal reset. The Citizens Utility Board called it a 31 percent cut the day it happened. Worth naming honestly: the seasonal system cuts rates once a year too. It just gives the cut back every June.

December 18, 2025 — both utilities get reconciliation increases. The ICC trimmed Ameren's $59.6 million request by $11.2 million, approving about $48.4 million (Docket 25-0382), and trimmed ComEd's $268.5 million request by $25.4 million, approving about $243 million (Docket 25-0383). Both reached delivery charges in January 2026.

January 2026 — the numbers land. Along with the ComEd delivery increase, ComEd's supply price for January 2026 was 9.66 cents per kWh — 47 percent above January 2025's 6.55 cents, because the June 2025 step-up never fully unwound. If your January bill made you do a double-take, this was why.

June 1, 2026 — summer supply rates. Ameren's summer supply price took effect at 11.326 cents per kWh on the first 800 kWh; ComEd's at 10.399 cents. Both run through September 30, 2026.

That's the history. Now the part your next bill actually cares about.

What's already scheduled next

Three changes are on the calendar right now. None of them are speculation.

October 1, 2026: the summer supply prices expire and the non-summer rates take effect. The new numbers haven't been published yet — they normally post on the ICC's Plug In Illinois site in the weeks before October 1. History says they land meaningfully lower, but the seasonal drop is smaller than the headline because it only touches supply.

December 2026: the ICC is expected to rule on the pending reconciliation requests — approximately $65.3 million from Ameren (Docket 26-0214) and approximately $234.3 million from ComEd (Docket 26-0215). CUB expects proposed orders in early November and final rulings in December. Whatever gets approved reaches bills in January 2027. ComEd's own framing is that, netted against a separate revenue refund, a typical residential bill would fall about $1.22 a month in 2027; CUB calls the $234.3 million a rate hike. Both things can be true at once, which tells you how these filings work.

2027 and beyond: PJM's 2027-28 capacity auction already cleared at a record $333.44 per megawatt-day — at the federal price cap — and that flows into ComEd supply prices starting June 2027. Ameren's current four-year rate plan ends in 2027, and its next multi-year plan, covering 2028 through 2031, is due to be filed during 2027. The next big delivery reset for central and southern Illinois is being built right now.

Notice the pattern. The increases arrive through rate cases and auctions that are decided months or years ahead. The relief arrives through one seasonal reset that gets reversed the following June.

What I tell people who ask "so when does this stop?"

I don't think it stops on its own, and I'd rather say that plainly than sell you false comfort. The drivers — data center demand, coal retirements, grid spending — are structural. Both grid operators have already priced 2027-28 higher than anything before it.

My honest read: the delivery half of your bill is out of your hands. The supply half isn't. That's the piece a solar lease replaces with a predictable rate as low as $0.10/kWh — with the full 25-year schedule in the contract before you sign. Whether that math works for your house depends on your roof, your usage, and which utility you're under. You can check the current verified rates on my Ameren and ComEd breakdowns, or run your own numbers in the savings calculator. Every savings figure is an estimate until we have looked at your actual bills.

And if you want a second set of eyes on your bill against this timeline, that's literally what I do all day. Call me at (618) 217-2001 or get in touch here. Estimates, dates and documents — no tea leaves.

Sources

Frequently Asked Questions

It depends on what you count, because Illinois bills move through several separate doors. Since late 2024 there have been at least six major events: the Illinois Commerce Commission approved an approximately $308.6 million Ameren Illinois delivery increase on December 19, 2024; both utilities' supply prices jumped roughly 47 to 53 percent on June 1, 2025 as capacity auction results hit bills; the ICC approved an approximately $48.4 million Ameren reconciliation increase and an approximately $243 million ComEd reconciliation increase on December 18, 2025, both reaching bills in January 2026; and the summer supply rates reset higher again on June 1, 2026. On top of those, supply prices reset twice every year with the seasons, so the number on your bill changes even in years with no rate case at all. The estimated all-in result: roughly 8 to 9 cents per kWh in 2021 has become approximately 15.5 cents for Ameren and approximately 17.07 cents for ComEd in 2026.
Yes, in two ways. First, the approximately $48.4 million reconciliation increase the Illinois Commerce Commission approved on December 18, 2025 (Docket 25-0382) reached bills in January 2026, stacking on the roughly $308.6 million multi-year delivery increase approved in December 2024. Second, on June 1, 2026 the seasonal summer supply price took effect at 11.326 cents per kWh on the first 800 kWh, well above the 8.769 cents non-summer price it replaced, and it runs through September 30, 2026. Ameren's estimated annual all-in average now sits around 15.5 cents per kWh, up from roughly 13 cents a year earlier and roughly 8 cents in 2021. And it is not finished: Ameren has approximately $65.3 million in additional delivery charges pending at the ICC in Docket 26-0214, with a decision expected in December 2026, and its next four-year rate plan, covering 2028 through 2031, is due to be filed in 2027.
The short version since 2021: ComEd's estimated all-in residential rate has gone from roughly 9 cents per kWh to approximately 17.07 cents in 2026, an increase of about 90 percent. The biggest single jolt came on June 1, 2025, when ComEd's Price to Compare went from 6.552 to 10.028 cents per kWh, about 53 percent, as PJM's 2025-26 capacity auction result of $269.92 per megawatt-day landed on bills, up from $28.92 the year before. The January 2026 price of 9.66 cents was still 47 percent above January 2025. Then on December 18, 2025 the Illinois Commerce Commission approved an approximately $243 million delivery reconciliation increase (Docket 25-0383) that reached bills in January 2026. The next two PJM auctions cleared at the federal price cap: $329.17 per megawatt-day for 2026-27 and a record $333.44 for 2027-28. ComEd also has approximately $234.3 million in 2025 costs pending in Docket 26-0215, with an ICC decision expected in December 2026.
Three things are already on the calendar. First, the Illinois Commerce Commission is expected to rule in December 2026 on the pending reconciliation requests, approximately $65.3 million from Ameren Illinois (Docket 26-0214) and approximately $234.3 million from ComEd (Docket 26-0215), and whatever is approved reaches bills in January 2027. ComEd's own framing is that, netted against a separate refund, a typical bill would fall about $1.22 a month in 2027; the Citizens Utility Board calls the filing a rate hike. Second, PJM's capacity auction for the 2027-28 delivery year already cleared at a record $333.44 per megawatt-day, which flows into ComEd supply prices starting June 2027. Third, Ameren's current four-year rate plan ends in 2027, and its next multi-year plan, covering 2028 through 2031, is due to be filed during 2027. None of these are guesses; they are filings and auction results that already exist. Treat any specific 2027 rate you see today as an estimate.
You cannot control delivery charges; those are set through Illinois Commerce Commission rate cases and everyone pays them. What you can control is the supply side, the part that has swung hardest since 2021. A residential solar lease replaces most of your supply purchases with a predictable rate as low as $0.10/kWh, with the full 25-year rate schedule written into the contract before you sign. Compare that to a utility supply price that jumped in June 2025, reset again in June 2026, and has a record capacity auction already priced in for 2027-28. Income-qualified households should look at Illinois Solar for All first, which the program itself describes as “guaranteed savings with no solar payment.” These are estimates, not promises; the honest way to know your number is to run your actual bill through the math, and I am happy to do that with you, line by line, before you decide anything.

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