Why Is My ComEd Bill So High?

If you've opened your recent ComEd bill and felt a serious sense of sticker shock, you're definitely not the only one. People across Northern Illinois and the Chicago area have been hit with some of the highest rates in years, leading to the same frustrating question: "Why is my ComEd bill so high?"

It isn't just a simple case of inflation. It's a combination of record-breaking capacity auction prices, the explosion of energy-hungry AI data centers in our backyard, a $243 million delivery rate increase, and a massive $15.3 billion grid plan on the horizon. Let's look at the actual data behind these spikes and what you can do to protect your wallet.

The Numbers: A Historical Look at ComEd Supply Rates

To understand where we are, we have to look at where we've been. ComEd's supply rates (the "Electricity Supply Charge" on your bill) have seen significant volatility over the last five years:

Even though the current non-summer rate dipped slightly from the June 2025 peak, it remains nearly double the rates we enjoyed in 2023-2024. And with the next PJM capacity auction results set to take effect in June 2026, experts warn another increase is likely.

1. The "Capacity Charge" Explosion

The single biggest driver of elevated prices isn't the cost of the electricity itself, but the cost of keeping the lights on. This is known as the "capacity charge."

PJM Interconnection, the regional grid operator that includes Illinois, has seen capacity auction prices explode over the past three years:

That's an over 1,050% increase in capacity costs in just three years. These costs are passed directly to ComEd customers, and the 2026/2027 prices take effect this June.

2. The Data Center Hub: Chicagoland's AI Boom

Northern Illinois has become one of the nation's largest data center hubs, with 244 active facilities and over 1,200 MW of operational capacity. Another 22 projects are in the pipeline, adding an estimated 3,900 MW more. The Chicago area alone faces a projected 900% increase in power demand from hyperscale data center projects.

A January 2026 report from the Union of Concerned Scientists found that data centers could account for up to 72% of Illinois' overall electricity growth by 2030, adding an estimated $24 to $37 billion in electricity system costs between 2026 and 2050 without stronger ratepayer protections.

Regulators are starting to respond. On March 19, 2026, the ICC approved a ComEd proposal requiring data center developers to put up multimillion-dollar deposits — often in the tens of millions — for new infrastructure buildout. Developers get the money back within 10 years if their project operates at projected demand, but ComEd keeps the deposits for projects that fall short, protecting ratepayers from bearing the cost of unused infrastructure.

3. Delivery Rate Hikes and a $15.3 Billion Grid Plan

While supply is the most volatile part of your bill, the "Delivery" portion (the cost to maintain the lines and transformers) is also rising. In December 2025, the ICC approved a $243 million rate reconciliation increase for ComEd — adding roughly $3.10 per month to the average residential bill starting in January 2026. The ICC did cut $25.4 million from ComEd's original $268.5 million request, striking costs related to the utility's botched billing system rollout.

Looking further ahead, ComEd filed a $15.3 billion grid plan for 2028-2031 in January 2026. The plan calls for new substations, renewable energy integration, and infrastructure upgrades to handle growing demand from EVs, data centers, and home electrification. If approved in full, it would add another $2.50-$3.00 to the average monthly bill.

4. New Law Promises Long-Term Relief

There is some good news. On January 8, 2026, Governor Pritzker signed the Clean and Reliable Grid Affordability Act (CRGA), which the Illinois Power Agency estimates will save energy customers $13.4 billion over the next 20 years.

Key provisions taking effect in 2026:

• Virtual Power Plants (June 2026): ComEd and Ameren must file VPP tariffs by June 1. Homeowners with battery storage can earn rebates by participating in scheduled-dispatch programs starting June 30.
• Battery Storage Procurement: The IPA will procure over 1,000 MW of utility-scale battery storage by August 2026, adding grid resilience and helping reduce peak pricing.
• Data Center Tax Incentive Freeze: Governor Pritzker proposed a two-year suspension of data center tax incentives starting July 1, 2026, shifting some grid costs back to the companies driving demand.

These measures won't lower your bill overnight, but they represent the most significant legislative effort to address electricity affordability in Illinois in years.

How to Fight Back: Strategies for Consumers

Even with rising baseline prices, you have options to lower your actual monthly expenditure:

The Verdict

With capacity prices at historic highs, data center demand straining the grid, and new delivery rate increases hitting your bill, 2026 is shaping up to be another expensive year for ComEd customers. But there are reasons for cautious optimism: the CRGA is the most aggressive affordability legislation Illinois has passed in years, and regulators are finally forcing data centers to pay their fair share.

In the meantime, the best thing you can do is stay informed about Chicago electricity price spikes and use tools to track rates in real-time.