Interstate Power and Light Co Electricity Rates and Average Bill (Iowa)
Data through August 2026 (the latest month EIA has published) · Updated October 31, 2026
As of August 2026, Interstate Power and Light Co's residential customers in Iowa paid an average effective rate of 21.48¢/kWh with an average monthly bill of $192.65, per EIA Form 861-M data. That rate is 4.4¢ above the Iowa average of 17.06¢/kWh; the U.S. average is 18.16¢/kWh.
Rate trend vs the Iowa average
View this chart as a table (last 12 months)
| Month | Rate (¢/kWh) | Avg bill ($/mo) | Avg usage (kWh/mo) |
|---|---|---|---|
| September 2025 | 17.69 | 122.04 | 690 |
| October 2025 | 18.09 | 105.89 | 585 |
| November 2025 | 17.32 | 108.96 | 629 |
| December 2025 | 16.59 | 141.57 | 853 |
| January 2026 | 16.56 | 149.39 | 902 |
| February 2026 | 17.64 | 120.33 | 682 |
| March 2026 | 17.51 | 111.46 | 636 |
| April 2026 | 17.11 | 95.66 | 559 |
| May 2026 | 16.83 | 103.03 | 612 |
| June 2026 | 20.61 | 161.25 | 782 |
| July 2026 | 20.73 | 225.01 | 1086 |
| August 2026 | 21.48 | 192.65 | 897 |
Interstate Power and Light Co vs Iowa vs the U.S.
| Interstate Power and Light Co | Iowa | U.S. average | |
|---|---|---|---|
| Rate (August 2026) | 21.48¢/kWh | 17.06¢/kWh | 18.16¢/kWh |
| Average monthly bill | $192.65 | $148.72 | $209.23 |
| Average monthly usage | 897 kWh | 872 kWh | 1152 kWh |
| Rate change, 1 year | +3.2% | +10.2% | +3.4% |
Estimate a bill at Interstate Power and Light Co rates
Worked example: 1,000 kWh at Interstate Power and Light Co's average effective rate of 21.48¢/kWh is about $214.80. The utility's actual average usage is 897 kWh/month, which produces the $192.65 average bill. This is an all-in average (energy, delivery, fixed charges, riders); your tariff's marginal price will differ.
See the full Iowa rate trend, look up another utility by ZIP code, or read why electric bills are rising.
Source: EIA Form 861-M (monthly utility-level sales to ultimate customers, residential), published with roughly a two-month lag. Rate = revenue ÷ sales; bill = revenue ÷ customers. Months failing basic sanity screens are excluded. See methodology.