Interstate Power and Light Company

Interstate Power and Light's optional time-of-day rates are the main tool for EV owners who want to cut charging costs. The utility does not publish a single EV-only rate, but it offers two optional residential time-of-day plans that work well for home charging. The Standard Time-of-Day rate (407) charges a premium only from 2 p.m. to 7 p.m. on summer weekdays in June, July and August, with lower off-peak pricing all other hours, weekends, and September through May. The Night Owl rate (427) is built for overnight EV charging, with the lowest price year-round from midnight to 8 a.m. Customers who can charge late at night benefit most.

Interstate Power and Light previously offered a residential rebate for Level 2 chargers, but that program is no longer accepting applications, so home customers should plan around the federal charger tax credit and the time-of-day rates instead. The utility's Smart Hours program is separate from the rate plans and can be combined with either time-of-day option; enrolling an EV or Level 2 charger pays a one-time reward plus a smaller amount each season. On the commercial side, charging support for businesses, communities, and multifamily properties runs through a separate Iowa business program.

Interstate Power and Light is the Iowa arm of Alliant Energy, which markets programs under the Alliant Energy brand across both Iowa and Wisconsin. The rates, rebates, and programs on this page apply only to Alliant's Iowa customers and are regulated by the Iowa Utilities Commission; the figures differ from those offered by Wisconsin Power and Light, Alliant's separate Wisconsin utility. Confirm jurisdiction before relying on any Alliant Energy program figure you find online.