Are Data Centers Driving Up Illinois Electricity Prices? What ComEd Homeowners Should Know

Are data centers driving up Illinois electricity prices? They are part of the story. Illinois is fast becoming part of the national data-center boom, and ComEd homeowners are feeling it first.

Much of that growth is in and around the Chicago area. There, large cloud-computing and AI facilities are adding a lot of new demand to the electric grid.

For homeowners, that raises a common question:

In Illinois, the answer is more direct than in some other states:

Data-center demand is clearly adding to higher regional power costs — but it is still not the only thing affecting your bill.

That difference matters.

Why Illinois Data Centers Matter to Homeowners

Data centers use huge amounts of power.

They run servers, network gear, cooling, backup systems and storage, often around the clock.

So they can add large, fairly steady new loads to the electric system.

Illinois energy planners now name data centers as one of the main drivers of new power demand in both ComEd and Ameren territories.

This is no longer a “what if.” It is part of how Illinois is planning for future power needs.

How Fast Is Data Center Demand Growing?

Illinois Power Agency planning, based on utility forecasts, shows data-center load rising quickly.

In ComEd territory, the forecast shows data-center power demand roughly doubling over the next five years. Even faster growth is expected in the early-to-mid 2030s.

In Ameren territory, data-center growth is also expected to speed up sharply before 2030.

So Illinois is preparing for a power system with much bigger loads than it has served in the past.

Northern Illinois Is the Center of the Growth

Most existing and planned Illinois data centers are near Chicago.

Current and proposed facilities are heavily clustered in northern Illinois. That suggests much of the future AI and data-center load growth will happen in ComEd's service area.

That is why ComEd customers hear more about data centers when rates come up.

ComEd Is Planning for Massive New Data Center Load

ComEd filings with regulators show how fast some of these large new loads may arrive.

One example is a high-voltage customer class for loads greater than 10 MW. For that class, ComEd forecast data-center billing demand of roughly 341 MW in 2025. It forecast that demand rising to about 1,838 MW in 2026, then to about 4,548 MW in 2027.

That is a dramatic jump.

It shows why data centers now affect both grid planning and power-market costs.

How Do Data Centers Affect Illinois Electricity Prices?

Northern Illinois, including ComEd territory, is part of PJM Interconnection. PJM runs the regional grid serving all or parts of 13 states plus the District of Columbia.

PJM must make sure there are enough power plants to meet future peak demand.

One way it does that is through a market called the capacity auction.

Capacity is not the power you use directly. It is a payment to make sure enough power plants and other resources are ready when the grid needs them.

When expected demand rises faster than power supply, capacity costs more.

That is exactly what has been happening.

PJM Capacity Prices Have Surged

For the 2026–2027 delivery year, PJM's capacity auction cleared at $329.17 per megawatt-day.

That is roughly 22% higher than the prior year's price in ComEd territory. It is about 11 times the price from two years earlier.

That higher capacity cost flows into power supply prices.

How Much Is ComEd Electricity Costing in 2026?

As of June 2026, ComEd's supply price was about 10.399 cents per kWh (kilowatt-hour, the unit on your bill).

From June 2026 through May 2027, ComEd estimated that higher power prices could cost the average customer around 12% more. Actual bills depend a lot on how much power a home uses and on the weather.

So Illinois homeowners are already feeling the effects of a pricier regional power market.

Are Data Centers the Reason PJM Prices Increased?

They are a major reason.

Analysts who watch the PJM market have named data-center power demand as the primary driver behind the recent jump in capacity prices.

But data centers are not the only factor.

Power prices are also affected by power plant closures and slow hookups for new power plants. Transmission limits, fuel costs, weather, plant availability and overall economic demand matter too.

So a more accurate way to put it is:

Illinois Regulators See the Same Trend

ComEd's 2028–2031 grid plans state that northern Illinois power demand is expected to grow fast. The reasons are electrification, large new factories and AI-driven data centers.

At the same time, limited new power plants across the region are helping push up energy and capacity prices.

That is one of the clearest official summaries of where Illinois stands.

Demand is rising quickly. Supply is not growing as quickly. Prices respond.

How Much Electricity Could Illinois Data Centers Eventually Use?

By some projections, data centers could use a much bigger share of the state's power over time.

Depending on the growth scenario, Illinois data centers could make up roughly 9.5% to 12.6% of statewide electricity use by 2030.

Those are projections, not guarantees. But they show why state planners take the issue seriously.

Illinois Had Been Incentivizing Data Centers

Illinois has offered a major Data Center Investment Program. It gave qualifying projects breaks from several state and local taxes.

To qualify, a project generally needed at least $250 million in capital investment. It also had to meet job and wage rules.

However, Illinois announced in June 2026 that it would stop processing new applications for the program starting July 1, 2026.

That is a big policy shift.

It suggests the state is rethinking how much it should subsidize future data centers.

Why Would Illinois Pull Back Incentives?

The policy debate now weighs economic development against impacts on the energy system.

Data centers can bring construction spending, property-tax revenue, tech infrastructure and some permanent jobs.

But they can also need huge amounts of power, transmission and generation.

That makes the cost-benefit math harder than it was when data centers used far less power.

Will Data Centers Cause ComEd Rates to Keep Rising?

Nobody can honestly promise an answer.

Capacity costs are expected to stay high in the near term. Another PJM auction has already produced historically high prices.

But future rates depend on what happens to both demand and supply.

If more power plants and transmission lines are added fast enough, that can ease future pressure. If data-center demand keeps growing faster than supply, costs may stay high.

PJM Is Already Trying to Solve the Supply Problem

PJM has been building new processes to handle large-load growth.

In 2026, PJM sped up work on several proposals. They aim to add power plants faster and improve how large loads connect. They also aim to assign costs to new large customers and keep the grid reliable.

PJM has described data-center growth as one of the main reasons for these reforms.

The goal is to avoid a future where demand arrives faster than the grid can reliably serve it.

So Is Your ComEd Bill Higher Because of a Data Center?

Partly, perhaps.

But your monthly bill is still a mix of:

plus delivery and other charges.

A higher supply price affects everyone. But a household using 700 kWh feels that increase differently than a household using 1,500 kWh.

That is why your own usage still matters.

What Can an Illinois Homeowner Actually Control?

You cannot control PJM capacity auctions, Chicago data-center building, power plant closures, transmission projects or regional power demand.

But you can control something much closer to home:

How much electricity your house needs to buy.

Step 1: Understand Your Household Consumption

Review about 12 months of power use.

Look for summer cooling spikes, winter heating spikes, rising yearly use, odd baseload use (the power your home uses all the time), and equipment changes.

When power prices are rising, cutting wasted power is worth more.

Step 2: Improve Efficiency

Illinois homes can waste power through aging HVAC systems, electric resistance heating, poor insulation, air leaks, leaky ductwork and inefficient appliances.

Suppose a household uses 15,000 kWh per year.

Efficiency upgrades cut that to 12,000 kWh.

That household now has 3,000 fewer kWh exposed to future power prices.

You cannot control the PJM auction. You can control how much electricity you need to buy.

Step 3: Evaluate Solar

Illinois is still an interesting solar market. Qualifying projects can benefit from making power on site, utility net-billing credits, and Illinois Shines REC incentives (payments for the clean-energy credits a system creates).

Solar can cut the amount of power a household buys from the grid.

But system design matters more now. Newer Illinois solar customers generally do not get the same full-retail net metering that older customers may have received.

Using your own solar power matters.

Step 4: Consider HVAC Before Oversizing Solar

Illinois has both hot summers and cold winters.

If an old HVAC system is driving your power use, fixing that load first may make more sense.

For example, current use of 18,000 kWh could fall to 14,000 kWh after HVAC and insulation upgrades.

Now the right solar system may be smaller and cost less.

The goal should not be to build enough solar to power waste forever.

Step 5: Consider Battery Storage for Resilience

Battery storage may help during storm outages. It can keep sump pumps, refrigerators, furnace controls, internet, medical equipment and other key circuits running.

A battery does not always lower an electric bill. Its main value may be backup power.

What About ComEd Hourly Pricing?

Some ComEd customers use hourly pricing plans, where power prices change by time of day.

That creates another possible lever.

During some high-demand periods, real-time prices can spike sharply.

For example, ComEd's hourly pricing data showed prices reaching 71.9 cents/kWh during one evening hour on July 15, 2026.

On July 1, one hour reached 88.1 cents/kWh.

Those were single-hour events, not normal average home rates. But they show how valuable flexible power use can be during stressed periods.

Could Batteries Become More Valuable in That Environment?

Possibly.

A battery can sometimes let a homeowner store lower-cost energy and avoid some high-price hours. It can also help you use more of your own solar power and keep power on during outages.

Whether that is worth enough money depends on the customer's rate plan and equipment cost.

Illinois' Data Center Story Is Really About Supply and Demand

The core issue is simple: Illinois power demand is rising.

Data centers are one of the biggest reasons.

At the same time, new power plants have not been added fast enough across PJM to keep pace.

That puts pressure on capacity prices.

The long-term answer is not just to stop building data centers. It is to make sure new loads pay their fair share and new power plants connect faster. Transmission also needs to grow where needed, and customers need tools to manage demand.

Should Illinois Homeowners Be Worried?

They should be informed.

In some states, the data-center impact is mostly a future concern. Northern Illinois is already seeing effects in the regional power market tied to fast-growing demand.

But panic still does not help. Energy strategy does.

You Cannot Control Chicago's Data Center Boom. You Can Control Your Home.

You cannot control how many new AI facilities are built, what the next PJM capacity auction clears at, or how fast new power plants connect.

But you can control whether your house wastes power and whether it uses efficient HVAC. You can also decide whether to make some power on site or keep backup power for key loads.

The Ashborn Approach

Ashborn Partners helps Illinois homeowners look at solar, HVAC, battery storage and whole-home energy efficiency in one personal home-energy review.

The goal is not to predict what ComEd power prices will be ten years from now. It is to find ways to reduce your household's exposure to energy costs now.