Interstate Power and Light (Alliant Energy) Rates and Bills

Interstate Power and Light (Alliant Energy) reported 419,451 residential customers on bundled service in 2025, using 739 kWh a month on average at 17.77 cents per kWh. Bundled means the utility supplies the energy and delivers it, so the price covers both. Among the 11 Iowa utilities with at least 10,000 bundled residential customers, Alliant Energy ranks 11 from the lowest price.

Source: U.S. Energy Information Administration, Form EIA-861 (final 2025 data), sales to ultimate customers. Price is revenue divided by sales and includes fixed charges.

EIA lists the counties where Alliant Energy has distribution equipment. That covers 84 counties in Iowa. A county can be served by more than one utility, so confirm your address with the utility or your bill.

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For 2025, Alliant Energy reported an average of 74 minutes without power per customer and 0.76 interruptions per customer, with major event days left out. The typical interruption lasted about 97 minutes. For comparison, the median state averaged 127 minutes of outage per customer.

Alliant Energy had about 53 fewer minutes of outage per customer than the median state. The Iowa figure across its utilities was 80 minutes. One interruption lasting 97 minutes and 0.76 interruptions a year per customer add up to the 74 minute total.

Source: U.S. Energy Information Administration, Form EIA-861 (final 2025 data), reliability schedule, measured under other standard. Utilities define events slightly differently, so compare with care.

• Time-of-use pricing. Alliant Energy reports a residential time-of-use pricing program in its 2025 EIA filing, with about 17,154 residential customers enrolled in dynamic pricing programs of all kinds. Ask the utility which rate schedules you qualify for. How time-of-use rates work.
• Rooftop solar and net metering. EIA shows 12,379 residential net-metered systems on the Alliant Energy grid in 2025, with 100.1 megawatts of capacity. How net metering works.

A private company owned by shareholders. A state commission reviews its costs and sets or approves its rates in formal rate cases. In Iowa, that review is done by the Iowa Utilities Commission.

Alliant Energy is an investor-owned utility based in Iowa.

Alliant Energy operates in the MISO power market. Power markets set wholesale costs, but your retail rate is set by the rules described above.

By residential customers, Alliant Energy ranks 2nd of the 22 utilities that report homes in Iowa, with about 28.7% of the state's homes. Iowa has too few other investor-owned utilities with reported prices to compare Alliant Energy with its type, so the state average of 13.62 cents per kWh is the fairest yardstick. At $131.38 a month, an average Alliant Energy home pays about $169 a year more than the Iowa average of $117.30, and uses 122 kWh a month less. Alliant Energy lists distribution equipment in 84 counties, so check your county and your bill before you assume it serves you. 12,379 of its residential customers use net metering, or 29.5 per 1,000 homes, against 16.2 for Iowa as a whole.

Source: U.S. Energy Information Administration, Form EIA-861 (final 2025 data). Peers are other utilities of the same type in Iowa with at least 1,000 residential customers and a reported price.

See every one on the electric companies in Iowa page.

Kilowatt Atlas is not Alliant Energy and does not take payments, start service or manage accounts. To pay a bill, report an outage or start service, use the website, app or phone number printed on your bill. Be careful with search ads and lookalike sites that offer to pay your bill for a fee.

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