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Will Illinois Have Rolling Blackouts? What ComEd's 'Critical Level' Alerts Mean (2026)

Ryan Cook•July 7, 2026•Updated Sep 17, 2026

Last week my phone started buzzing with the same question from three different directions: "ComEd just told us the grid is at a critical level — are we about to get blackouts?"

Fair question. Starting July 1, ComEd sent urgent alerts to customers on Chicago's West Side and in several west and southwest suburbs — and later the Joliet area — saying demand on the local grid had hit a "critical level" and asking people to cut electricity use immediately. When the biggest utility in the state uses the word "critical" during a 95-degree stretch, people notice.

Here's the honest answer, because I think Illinois homeowners deserve better than either "everything's fine" or fear-bait: no outages actually happened, full rolling blackouts remain unlikely this summer — and the system still has less slack in it than at any point I've seen in my years selling solar here. All three of those things are true at once.

What actually happened during the heat wave

The alerts were real, but read them carefully. ComEd's warnings covered specific areas — not its whole territory. Demand on the local equipment serving those neighborhoods, the transformers and distribution lines, was approaching what that hardware can safely carry in extreme heat. Asking customers to conserve was ComEd managing stress on local wires before something failed.

That's a very different animal from the thing people picture when they hear "blackout risk." A rolling blackout is a deliberate, last-resort move ordered by the regional grid operator — PJM up north for ComEd, MISO downstate for Ameren Illinois — when total generation can't meet total demand across the region. Operators cut blocks of customers in rotation to keep the whole grid from collapsing.

Illinois hasn't had one. And nothing that happened in early July was that. WGN and CBS Chicago both confirmed no customers lost service during the alerts.

So how close are we, really?

Closer than we were five years ago. Not as close as the headlines suggest.

NERC — the organization that grades grid reliability across North America — published its 2026 Summer Reliability Assessment before the season started. MISO, which covers Ameren's central and southern Illinois territory, came in with reserve margins above its 12% reference level. PJM entered the summer with adequate reserves too. Translation: on paper, both regions have enough power for a normal summer peak, with cushion.

The catch is in NERC's longer-term outlook, which flags both MISO and PJM as elevated-risk regions later this decade. Demand from data centers is growing faster than new generation is being built, and older plants keep retiring. The cushion shrinks a little every year. My take: the risk this summer isn't the grid operator turning your power off on purpose — it's a heat-stressed transformer in your neighborhood giving out at 4 PM on the hottest day of the year. Localized equipment failures are the realistic threat, and they're exactly what those conserve alerts were trying to prevent.

You're already paying for the tight grid

Here's the part that connects to your bill. A tighter system costs more to keep reliable, and that cost showed up on June 1.

Record prices in the capacity auctions — the market where utilities reserve backup power for peak days — pushed Ameren's summer supply rate to 11.326¢ per kWh, about 39% higher than summer 2024. ComEd's summer rate sits at 10.399¢, and the utility estimates customers pay roughly 12% more on average from June 2026 through May 2027. All-in, you're looking at approximately 20¢ per kWh in Ameren territory and 17¢ in ComEd's once delivery and fees stack on. I broke down why Ameren bills keep climbing if you want the full mechanics.

Grid strain and rate pain are the same story. The scarcity that triggers conserve alerts is the scarcity you're billed for.

What you can actually control

When a conserve alert hits your area, take it seriously — it's protecting the equipment that keeps your lights on. Bump the thermostat a couple degrees, close blinds on the sun side, push laundry and dishes to after 7 PM. Small stuff, but it's the point of the alert.

Longer term, the honest options are two. You can hope the grid build-out catches up with demand — and Illinois is working on it, but new generation takes years. Or you can make your home less dependent on the grid's worst days. A solar system with battery backup keeps the basics running when the neighborhood transformer taps out: the battery covers roughly 8 to 12 hours of refrigerator, Wi-Fi, and lights, and the panels recharge it every morning. I wrote a full guide on what a solar battery actually powers in Illinois, including the $300-per-kWh state rebate that knocks an estimated $4,050 off a standard battery.

One thing solar alone won't do: run your house during an outage. Grid-tied panels shut off automatically when the grid goes down — a safety rule, no exceptions — so the battery is what turns solar into backup power.

For most families I work with, the math conversation starts with rates — a lease gives you a rate as low as 10¢ per kWh, predictable for 25 years, while summer grid power runs 17–20¢ — and the blackout protection rides along with it. If July's alerts had you checking flashlight batteries, it's worth running your actual numbers.

Call or text me at (618) 217-2001, or reach out here. I'll tell you straight whether backup power makes sense for your house — including when it doesn't.

Frequently Asked Questions

Full-scale rolling blackouts are unlikely in Illinois this summer, based on the actual grid data. NERC's 2026 Summer Reliability Assessment shows MISO — the grid operator for Ameren's central and southern Illinois territory — carrying reserve margins above its 12% reference level, and PJM, which serves ComEd territory, also entered the summer with adequate reserves. What Illinois saw during the July heat wave was different: localized strain on ComEd's distribution equipment in specific neighborhoods, which triggered conserve-energy alerts but zero actual outages. The realistic risk for most homeowners isn't a grid-operator-ordered rotating blackout — it's a heat-stressed transformer or line failing in your area during a long stretch of 95-degree days. That said, NERC's longer-term assessments flag both MISO and PJM as elevated-risk regions later this decade as data-center demand grows faster than new generation gets built, so the margin for error is thinning year by year.

ComEd's 'critical level' alerts in early July 2026 meant that demand on the local distribution equipment serving specific areas — Chicago's West Side, several west and southwest suburbs, and later the Joliet area — was approaching the limits of what that local hardware could safely carry in extreme heat. The utility asked those customers to reduce electricity use immediately so transformers and lines serving their neighborhoods wouldn't overload. It was not a system-wide emergency, and no outages were reported. That distinction matters: a conserve alert is the utility managing stress on local wires, while a rolling blackout is a last-resort order from the regional grid operator (PJM for ComEd, MISO for Ameren Illinois) to cut blocks of load because generation can't meet total demand. Illinois has not had one of those. If you get an alert, raising the thermostat a couple degrees and delaying laundry until evening genuinely helps.

Two forces hit at once. Demand is climbing — data centers are the fastest-growing load in both grid regions, and a hot summer piles air conditioning on top. Meanwhile, older power plants have retired faster than replacements have come online, which shrinks the cushion between supply and peak demand. You're paying for that squeeze already: record prices in the capacity auctions — the market where utilities reserve backup power — pushed Ameren Illinois' summer supply rate to 11.326 cents per kWh, roughly 39% higher than summer 2024, and ComEd estimates its customers pay about 12% more on average from June 2026 through May 2027. So the grid strain and the bill increase are the same story told two ways: a tighter system costs more to keep reliable. Heat waves like early July's don't cause the problem, but they expose it — that's when local equipment runs closest to its limits.

Not by themselves — and this surprises most homeowners I talk to. Nearly all residential solar systems are grid-tied, and a federal safety rule called anti-islanding shuts them down the moment the grid goes out, so panels alone won't run your house during an outage no matter how sunny it is. Pairing the system with a battery changes that: the battery powers the basics — refrigerator, Wi-Fi, lights, phone chargers — for roughly 8 to 12 hours, and the panels recharge it the next morning, which can carry a home through multi-day outages. Illinois' Distributed Generation rebate pays $300 per kilowatt-hour of storage, worth an estimated $4,050 on a standard 13.5 kWh battery. On a solar lease, battery backup is typically built into the monthly payment — roughly $45 to $70 a month depending on how many batteries the home needs.