Illinois (IL) • Commonwealth Edison (ComEd) & Ameren IllinoisModel: Time-Varying

ComEd & Ameren Illinois Post-2025 Net Metering (Supply-Only) & SREC Guide

On January 1, 2025, Illinois ended full retail 1:1 net metering for new ComEd and Ameren customers—cutting exported kWh credits to Supply-Only (~8¢/kWh) while creating $300/kW Smart Inverter + $300/kWh Battery Storage upfront rebates alongside Illinois Shines SRECs.

Peak Import Rate

$0.16 – $0.19 / kWh (Supply + Delivery + Taxes)

Midday Export Credit

$0.075 – $0.092 / kWh (Supply-Only Credit; Delivery portion no longer netted 1:1)

Peak Export / VPP Bonus

PJM Real-Time Hourly Capacity Spikes + $250–$300/kW Battery Rebate

Min Monthly Bill

$14.50 Customer & Metering Charge

1. 24-Hour Import Cost vs. Export Credit Visualizer

Schedule: IL CEJA Post-2025 Supply-Only Net Metering + Smart Inverter DG Rebate ($300/kW)

Compare what Commonwealth Edison (ComEd) & Ameren Illinois charges you to import 1 kWh vs. what they pay you when you export 1 kWh during each time window—and how your battery inverter should be programmed:

8:00 AM – 4:00 PM (Midday Solar Generation)

Import: 17.5¢/kWhExport: 8.2¢/kWh

Grid Buy:

Grid Sell:

Inverter Dispatch Rule: Exporting loses ~9.3¢/kWh delivery charges! Store midday solar inside LFP battery to self-consume 100%

4:00 PM – 11:00 PM (Evening Home Consumption)

Import: 17.5¢/kWhExport: 8.2¢/kWh

Grid Buy:

Grid Sell:

Inverter Dispatch Rule: Discharge LFP battery to save the full 17.5¢/kWh retail Supply + Delivery rate

2. Forensic Tariff & Battery Arbitrage Math

Battery Pairing Necessity Score: 87% Mandatory (Post-Jan 1, 2025 exports lose ~6.5¢/kWh delivery credit + unlocks $300/kW battery rebate)

1Why Post-2025 Illinois Solar Needs a Battery: Before 2025, ComEd credited both Supply (~8¢) and Delivery (~9¢) on exported solar. For systems interconnected in 2025 and 2026, exports only credit Supply (~8¢/kWh). Every kWh you store in your battery and use at night saves the full 17.5¢/kWh (saving an extra 9.5¢/kWh on delivery charges!).
2Double Cash Rebates (Illinois Shines SRECs + $300/kW DG Rebate): A 10 kW solar + 14.3 kWh battery system in ComEd territory receives ~$10,500–$12,500 in upfront Illinois Shines SREC checks PLUS $3,000 ($300/kW) Smart Inverter Rebate PLUS ComEd battery storage incentives!

Optimal Hardware Architecture for Commonwealth Edison (ComEd) & Ameren Illinois

EG4 18kPV (IEEE 1547-2018 Smart Inverter) + 14.3kWh Heated LFP Battery

Estimated Payback under IL CEJA Post-2025 Supply-Only Net Metering + Smart Inverter DG Rebate ($300/kW): 4.2 – 5.1 Years (After Illinois Shines SREC Check & DG Rebate)

View Direct Wholesale Pricing →

Commonwealth Edison (ComEd) & Ameren Illinois Solar Tariff FAQ

Can I still get the Illinois Shines SREC check AND the $300/kW ComEd Smart Inverter Rebate?

Yes! Under the Climate and Equitable Jobs Act (CEJA), residential solar customers can stack the Illinois Shines Adjustable Block Program (ABP) SREC lump-sum payment with the utility’s $300/kW Distributed Generation (DG) Smart Inverter Rebate.

Does adding a battery qualify for an additional ComEd rebate in Illinois?

Yes, ComEd and Ameren offer dedicated energy storage rebates ($250–$300/kWh) for residential batteries enrolled in time-of-use or peak-load management tariffs.

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