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TOU Rate Structure

Solar ROI for Commonwealth Edison (ComEd) Customers

Commonwealth Edison (ComEd) charges an average of $15.8¢/kWh. Peak rates reach $21.8¢/kWh with off-peak at $9.8¢/kWh, creating strong battery arbitrage value. A 7 kW solar system produces a $6,836 NPV over 25 years.

$14,210
Net System Cost
$6,836
25-Year NPV
11 years
Payback Period
$0.174/kWh
Solar LCOE

Commonwealth Edison (ComEd) Rate Structure

ParameterRate
Average residential rate$15.8¢/kWh
Peak rate$21.8¢/kWh
Off-peak rate$9.8¢/kWh
Peak/off-peak spread$12.0¢/kWh
Rate structureTOU
Export credit policy1:1 net metering. Illinois Shines SREC payments.

Solar System Economics

A 7 kW solar system for a Commonwealth Edison (ComEd) customer costs $20,300 before incentives. The 30% federal ITC saves $6,090. The net out-of-pocket cost is $14,210.

At Commonwealth Edison (ComEd)'s $15.8¢/kWh average rate, the system saves $1,327 in year one, producing 8,400 kWh. The solar LCOE of $0.174/kWh is -10% below Commonwealth Edison (ComEd)'s current rate.

Battery Storage for Commonwealth Edison (ComEd) Customers

$8,400
Battery Net Cost
$1
Daily Arbitrage
$399
Annual Arbitrage
-$5,486
25-Year Battery NPV

Commonwealth Edison (ComEd)'s TOU spread generates $399/year in arbitrage value. The 25-year battery NPV of -$5,486 suggests batteries are marginal on economics alone. Backup power value and grid services programs may improve the case.

FAQ: Solar for Commonwealth Edison (ComEd) Customers

How much can Commonwealth Edison (ComEd) customers save with solar?
A typical 7 kW solar system saves Commonwealth Edison (ComEd) customers approximately $1,327/year in electricity costs. Over 25 years, the NPV of savings after system costs is $6,836.
What is Commonwealth Edison (ComEd)'s rate structure?
Commonwealth Edison (ComEd) uses a time-of-use (TOU) rate structure with peak rates of $21.8¢/kWh and off-peak rates of $9.8¢/kWh. The $12.0¢/kWh peak/off-peak spread creates significant value for battery storage — TOU arbitrage alone is worth $399/year.
Does Commonwealth Edison (ComEd) offer net metering?
1:1 net metering. Illinois Shines SREC payments.
Should Commonwealth Edison (ComEd) customers add battery storage?
Battery storage for Commonwealth Edison (ComEd) customers has a 25-year NPV of -$5,486. The economics are marginal based on TOU savings alone, but backup power value and future grid services programs may change the equation.

Other Utilities in Illinois

Ameren Illinois
$14.8¢/kWh · FLAT
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