Electric bills are changing in parts of PJM starting June 1, 2026. Many homes and small businesses in Maryland, Delaware, and northern Illinois will see updates. Here is what is driving them and how these changes can show up on your bill.

The PJM capacity price for 2026/2027

PJM runs a market to pay resources to be ready when power is needed. This is called the capacity market. For the 2026/2027 year, PJM’s auction cleared at $329.17 per megawatt-day (UCAP) across the entire PJM region.

PJM estimated this could mean about a 1.5–5% year-over-year increase in some customers’ bills. The impact depends on how each utility or supplier passes through these costs. Not every customer will see the same change.

Where it shows up on your bill

Capacity costs flow into the supply portion of your electric bill. That is the part covering energy and related market costs. Delivery charges are separate and pay for poles, wires, and service.

Utilities and suppliers recover capacity costs through supply rates set under state rules. For example, ComEd says PJM capacity auction costs appear in the supply portion of customer bills. ComEd passes these costs on to customers with no markup.

Delaware: Delmarva Power SOS update starting June 1

Delmarva Power customers in Delaware on Standard Offer Service (the default supply) face a higher supply rate beginning June 1, 2026. Delmarva reports an 18–20% increase in the price of electricity. The company estimates this equals about a 9% increase in the average overall bill.

For a typical residential customer using about 811 kWh per month, Delmarva estimates the average overall bill increase at about $14.64 per month. Actual bills vary with usage. For program details and enrollment basics in the state, see our Delaware community solar page.

Maryland: OPC’s rough monthly capacity-market estimates

Maryland’s Office of People’s Counsel (OPC) shared rough estimates of the capacity-market part of bills for June 1, 2026–May 31, 2027, versus the prior year. These are not full bill changes. They are rough monthly figures that depend on individual usage and regulatory timing.

  • BGE: about 83 cents per month before credits, and an estimated $3.36 decrease after reliability credits
  • Pepco (Maryland) and SMECO: about $3.34 before credits, about $2.50 after credits
  • Delmarva Power (Maryland): about $5.24
  • Potomac Edison: about $3.21

These are OPC’s rough estimates of the capacity-market piece only. Your total bill will also reflect your usage, energy prices, and other approved charges or credits. For more background on programs in the state, visit our Maryland page.

Northern Illinois (ComEd): how the cost is passed through

In northern Illinois, ComEd says capacity auction costs appear in the supply portion of customer bills. ComEd passes these market costs through with no markup. There is no 2026 dollar figure to share here, but customers should expect the supply line to reflect capacity charges set by PJM for the 2026/2027 year. If you are in ComEd territory and want to learn how community solar works alongside the utility bill, see our Illinois page.

Summer weather and usage still matter

Your monthly bill depends on how much electricity you use. Summer heat and humidity can push air conditioners and fans to run longer. That raises kilowatt-hour use and can lead to higher bills, even when prices stay the same.

So you may see two effects at once this summer. First, supply prices can reflect the new capacity market costs. Second, hotter or more humid weather can increase your usage. The combination affects the total you pay.

How community solar credits interact with supply prices

Community solar does not change utility supply prices. Instead, it adds bill credits based on power produced by a local solar project. Those credits cover part of your bill under each state’s program rules.

Subscribers pay for their subscription at a rate that is less than the value of the solar credits. Any discount applies to the credits, not to your entire bill. Savings depend on your state, your utility, and the project.

When supply prices rise, your community solar credits still apply under the program rules. They can reduce a portion of what you owe the utility. But community solar does not undo changes in supply rates. A subscription supports local solar energy while working alongside your regular bill.

What to watch this summer

  • Updates from your utility on supply rates and any program credits
  • Your own usage during heat waves and humid stretches
  • Community solar availability in your area and how credits appear on your bill

We will keep tracking PJM market updates and utility changes. If you live in Maryland, Delaware, or northern Illinois, watch supply-rate notices and your usage. Understanding these pieces can help you make sense of your bill this summer.