Alliant Energy (Interstate Power & Light) and solar
Alliant Energy (Interstate Power & Light) is an investor-owned utility serving about 419,451 homes in Iowa. Here's what its rates and export rules mean for solar: for a typical customer, solar is a close call.
- Average price (2026 est.)
- 18.4¢31% above Iowa average
- Typical bill
- $136739 kWh a month
- Exports credited
- RetailFull retail net metering
- Typical payback
- 15.9 yrs5.9 kW, cash
Export rules for Alliant Energy (Interstate Power & Light) customers
Full retail net metering, varies netting.
Inflow-outflow billing at retail energy rate.
Solar for a typical Alliant Energy (Interstate Power & Light) home
| System | 5.9 kW (90% of 739 kWh/month) |
|---|---|
| Cost | $22,675 |
| First-year savings | $1,477 |
| Payback | 15.9 years |
| 25-year net | $14,432 |
Uses the utility's average price.
Solar adoption
- Homes with solar (2025)
- 12,379
- Share of customers
- 3.0%
- Residential solar capacity
- 100 MW
- Residential customers
- 419,451
EIA-861, 2025.
Cities served
Questions about Alliant Energy (Interstate Power & Light) and solar
Does Alliant Energy (Interstate Power & Light) have net metering?
Inflow-outflow billing at retail energy rate.
How much does electricity cost with Alliant Energy (Interstate Power & Light)?
Residential customers paid an average of 17.8¢ per kWh in 2025 (EIA), about 18.4¢ adjusted to 2026. The typical home uses 739 kWh a month, a bill of about $136.
Is solar worth it with Alliant Energy (Interstate Power & Light)?
For a typical customer, solar is a close call: a 5.9 kW system costing about $22,675 pays back in about 15.9 years, with $14,432 net over 25 years.
How many Alliant Energy (Interstate Power & Light) customers have solar?
About 12,379 homes had net-metered solar at the end of 2025, roughly 3.0% of residential customers (EIA-861).
Legal name: Interstate Power and Light Co (EIA ID 9417). Data: EIA-861 2025 and monthly data through 2026, state policy research October 2026.