Electricity rates — Interstate Power and Light Co
A household served by Interstate Power and Light Co using 1,000 kWh a month pays about $1,320.16 a year on the cheapest of 3 generally available plans — Electric Residential Service Optional Demand - 507 from Interstate Power and Light Co, in effect since July 2025. Rates checked September 23, 2026. A further 1 restricted and 2 older schedules are priced further down but not ranked.
Every priced plan, 1,000 kWh/mo
| Plan | Per year | vs cheapest | Effective |
|---|---|---|---|
| Electric Residential Service Optional Demand - 507✓ cheapesttime-of-use · demand charge · in effect since July 2025 | $1,320.16 | — | 11.0¢ |
| Optional Residential Service Demand Rate Rd-1 (Wisconsin)time-of-use · demand charge · in effect since July 2014 · older schedule, not ranked | $1,394.76 | +$74.60 | 11.6¢ |
| Optional Residential Time of Use Rg-5 (Wisconsin)time-of-use · in effect since July 2014 · older schedule, not ranked | $1,502.19 | +$182.03 | 12.5¢ |
| Electric Residential Service Usage - 400 [Net Metering Pilot]priced by season · tiered · in effect since April 2018 · pilot programme | $1,954.29 | +$634.13 | 16.3¢ |
| Electric Residential Service Usage Time of Day - 407time-of-use · in effect since July 2025 | $2,077.42 | +$757.26 | 17.3¢ |
| Electric Residential Service Usage - 400priced by season · in effect since July 2025 | $2,095.41 | +$775.25 | 17.5¢ |
Cost across usage levels
The cheapest plan at each consumption level, showing whether the ranking holds as usage changes.
- 500 kWh/mo — cheapest $753.05 (Electric Residential Service Optional Demand - 507), dearest $1,140.72, a $387.67 spread
- 1,000 kWh/mo — cheapest $1,320.16 (Electric Residential Service Optional Demand - 507), dearest $2,095.41, a $775.25 spread
- 2,000 kWh/mo — cheapest $2,454.29 (Electric Residential Service Optional Demand - 507), dearest $4,004.79, a $1,550.50 spread
What a typical bill costs
At 1,000 kWh a month the 3 generally available plans here run from $1,320.16 on Electric Residential Service Optional Demand - 507 to $2,095.41 on Electric Residential Service Usage - 400, with a median of $2,077.42.
Effective rates, bill divided by kilowatt-hours, span 11.0¢ to 17.5¢ per kWh at that usage.
What Interstate Power and Light Co's customers were billed in 2024
Priced at 714 kWh a month, what Interstate Power and Light Co's customers used on average, its open plans come within 1% of what EIA reports they were billed in 2024: the plans here describe its bills well.
| Ownership, as EIA classes it | Investor-owned |
|---|---|
| Full-service homes in Iowa | 417,153 |
| Share of Iowa's households | 29% |
| Average use per home | 714 kWh a month |
| Average bill per home | $127.80 a month |
| Billed per kWh, riders included | 17.9¢ |
| Median open plan here, at that use | 17.9¢ |
Interstate Power and Light Co in U.S. Energy Information Administration, Form EIA-861, 2024 (Sales_Ult_Cust_2024.xlsx), retrieved September 23, 2026.
How it compares
Among the 109 utilities indexed, Interstate Power and Light Co's cheapest open plan is the 19th-lowest, 20% less than their median of $1,649.16. It sits between United Power, Inc ($1,244.91) and El Paso Electric Co ($1,323.34).
Electric Residential Service Usage - 400 changes price with the season: a kWh costs 3.4¢ more in June to August than in September to May, and the same 1,000 kWh is billed $200.46 in its dearest month against $164.87 in its cheapest.
In the guides: The price that changes with the month
How the answer changes with usage
Electric Residential Service Optional Demand - 507 is cheapest at every level tested — $753.05 a year at 500 kWh a month, $2,454.29 at 2,000 kWh.
The penalty for a poor choice grows with usage: $387.67 a year at 500 kWh against $1,550.50 at 2,000 kWh.
Cheapest 6 plans at 1,000 kWh a month
Electric Residential Service Optional Demand - 507 — $1,320.16 a year, 11.0¢ per kWh effective, time-of-use and demand-charged. It carries a $0.51 daily standing charge. In effect since July 2025.
Optional Residential Service Demand Rate Rd-1 (Wisconsin) — $1,394.76 a year, 11.6¢ per kWh effective, time-of-use and demand-charged. It carries a $15.00 monthly standing charge. In effect since July 2014. Too old to quote as a current price.
Optional Residential Time of Use Rg-5 (Wisconsin) — $1,502.19 a year, 12.5¢ per kWh effective, time-of-use. It carries a $15.00 monthly standing charge. In effect since July 2014. Too old to quote as a current price.
Electric Residential Service Usage - 400 [Net Metering Pilot] — $1,954.29 a year, 16.3¢ per kWh effective, tiered and priced by season. It carries a $13.00 monthly standing charge. In effect since April 2018. Too old to quote as a current price.
Electric Residential Service Usage Time of Day - 407 — $2,077.42 a year, 17.3¢ per kWh effective, time-of-use. It carries a $0.51 daily standing charge. In effect since July 2025.
Electric Residential Service Usage - 400 — $2,095.41 a year, 17.5¢ per kWh effective, priced by season. It carries a $0.51 daily standing charge. In effect since July 2025.
How these plans are structured
Of 6 priceable plans: 1 tiered, 4 time-of-use, 2 priced by season, 2 with demand charges.
Fixed monthly charges run from $13.00 to $15.29.
Who provides these plans
EIA-861 lists Interstate Power and Light Co serving homes in Iowa and in no other state, which is how its plans are placed there. 6 of its 6 published residential schedules can be priced.
The largest saving available here
Moving from Electric Residential Service Usage - 400 to Electric Residential Service Optional Demand - 507 saves $775.25 a year at 1,000 kWh a month, with no change in consumption.
What this does not cover
4 of these plans price by the hour, so their figures are marked lower confidence.
New to these terms? The methodology page explains tiered bands, time-of-use periods and fixed charges, and sets out exactly what the rate engine assumes.
Estimate — your actual bill may differ.
Tariff structures from NREL/OpenEI Utility Rate Database (CC0 1.0), retrieved September 23, 2026.