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FLAT Rate Structure

Solar ROI for Ameren Illinois Customers

Ameren Illinois charges an average of $14.8¢/kWh. A 7 kW solar system produces a $5,277 NPV over 25 years.

$14,210
Net System Cost
$5,277
25-Year NPV
11 years
Payback Period
$0.174/kWh
Solar LCOE

Ameren Illinois Rate Structure

ParameterRate
Average residential rate$14.8¢/kWh
Rate structureFLAT
Export credit policy1:1 net metering at retail rate

Solar System Economics

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

At Ameren Illinois's $14.8¢/kWh average rate, the system saves $1,243 in year one, producing 8,400 kWh. The solar LCOE of $0.174/kWh is -18% below Ameren Illinois's current rate.

Battery Storage for Ameren Illinois Customers

$8,400
Battery Net Cost
$0
Daily Arbitrage
$0
Annual Arbitrage
-$11,382
25-Year Battery NPV

Ameren Illinois uses a flat rate structure without significant peak/off-peak spread. Battery value comes primarily from backup power and net metering optimization rather than TOU arbitrage.

FAQ: Solar for Ameren Illinois Customers

How much can Ameren Illinois customers save with solar?
A typical 7 kW solar system saves Ameren Illinois customers approximately $1,243/year in electricity costs. Over 25 years, the NPV of savings after system costs is $5,277.
What is Ameren Illinois's rate structure?
Ameren Illinois uses a flat rate structure at an average of $14.8¢/kWh. Without a large peak/off-peak spread, battery storage value comes primarily from backup power and net metering optimization.
Does Ameren Illinois offer net metering?
1:1 net metering at retail rate
Should Ameren Illinois customers add battery storage?
Battery storage for Ameren Illinois customers has a 25-year NPV of -$11,382. 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

Commonwealth Edison (ComEd)
$15.8¢/kWh · TOU
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