Ameren Illinois is an investor-owned utility serving about 1,062,810 homes in Illinois. Here's what its rates and export rules mean for solar: for a typical customer, solar is worth it.
Reduced export credit — about 10¢ per exported kWh, monthly netting.
Supply credit varies (summer 2025 ~12 cents). Battery rebate requires real-time pricing or demand response enrollment.
Supply-only net metering (IL, systems on/after 2025-01-01): supply portion netted; delivery/taxes billed on gross imports; excess credited at supply rate, non-expiring; $300/kW DG rebate available.
| System | 7.7 kW (100% of 882 kWh/month) |
|---|---|
| Cost | $25,830, $23,520 after incentives |
| First-year savings | $1,883 |
| Payback | 11.8 years |
| 25-year net | $38,561 |
Uses the utility's average price; time-of-use plans can change this, so pick your plan in the calculator.
Rates we verified from Ameren Illinois's tariff documents. Prices are per kWh including the main riders where noted; check your bill for the plan you're on.
Plan for solar customers. Effective 2026-10-01. Fixed charge $14.51/month.
| Period | Price |
|---|---|
| 12am–12am (4 months) | 19.3¢ |
| 12am–12am (8 months) | 15.1¢ |
Non-summer (Oct-May) is tiered: first 800 kWh all-in 15.139c (PTC 10.441 + distribution 4.572 + EDT 0.126); over 800 kWh all-in 10.815c (PTC 8.262 + distribution 2.427 + EDT 0.126). Summer flat.
EIA-861, 2025.
Supply credit varies (summer 2025 ~12 cents). Battery rebate requires real-time pricing or demand response enrollment. Exported power is credited at about 10¢ per kWh.
Residential customers paid an average of 17.9¢ per kWh in 2025 (EIA), about 19.1¢ adjusted to 2026. The typical home uses 882 kWh a month, a bill of about $168.
For a typical customer, solar is worth it: a 7.7 kW system costing about $23,520 pays back in about 11.8 years, with $38,561 net over 25 years.
About 39,801 homes had net-metered solar at the end of 2025, roughly 3.7% of residential customers (EIA-861).
Legal name: Ameren Illinois Company (EIA ID 56697). Data: EIA-861 2025 and monthly data through 2026, state policy research October 2026, utility tariff sheets.