Iowa · Investor Owned · serves 641 ZIP codes
Interstate Power and Light Co rate plans
2 residential plans are currently open to new customers that we can price side by side. Some charge different prices depending on the hour — which is where most of the savings hide.
Looking for when the expensive hours are? Interstate Power and Light’s peak hours, plan by plan →
What does Interstate Power and Light cost at a normal month’s usage?
A household using 1,000 kWh a month pays about $2,129 a year on the cheapest of the 2 plans we can price here — Electric Residential Service Usage - 400 — and $2,143 on the priciest. Same house, same wires.
| A month of | Cheapest, a year | On which plan | Priciest |
|---|---|---|---|
| 500 kWh | $1,158 | Electric Residential Service Usage - 400 | $1,165 |
| 1,000 kWh | $2,129 | Electric Residential Service Usage - 400 | $2,143 |
| 2,000 kWh | $4,073 | Electric Residential Service Usage - 400 | $4,101 |
The same plan is cheapest at every level of use here, so the answer does not turn on how much you use. Estimates from the filed tariff, priced hour by hour on a household with central air — not a quote.
How much does the plan you pick actually matter here?
Run the same three-bedroom house with central air through every plan Interstate Power and Light Co files, and the bill lands anywhere between $1,716 and $1,727 a year. That $11 spread is not a difference in electricity — it is the same kilowatt-hours, from the same wires, priced under different rules. Nobody sends you a letter when you are on the wrong side of it.
1 of these 2 plans price by the hour. Those are the ones where moving laundry, dishes, or car charging into the cheap window changes the bill; on the rest, the clock is irrelevant and only the total matters. Which camp you belong in is the first question worth settling, because it decides whether shifting your day is worth anything at all.
How Interstate Power and Light compares with the rest of the country
Interstate Power and Light is the only Iowa utility we can price, so there is no in-state comparison to make. Against the whole country there is: run the same three-bedroom house with central air through its default plan at each of the 127 utilities we cover, and Interstate Power and Light lands 84th cheapest — in the dearer half — at about $1,716 a year against a national median of $1,566. The range runs from $905 at Entergy Louisiana (Louisiana) to $4,726 at San Diego Gas & Electric (California).
The other two households sit in the same place: a small apartment pays about $961 here against a national median of $901, and the same house with an electric car charging overnight about $2,297 against $2,067. Effective rate, fixed charge included, is 18.2¢ per kilowatt-hour for the family home.
Inside Interstate Power and Light itself, the gap between its cheapest and dearest plan for that house is $11 a year. That is the part of the bill a customer here can act on; the rest is set by which utility the address falls under.
Which plan would cost you least?
No bill upload, no sign-up. Tell us roughly what a month costs you and what runs on electricity — we price every plan against the same household and show you the gap.
That adds up to 9,375 kWh a year. Compare it to the total on your bill and adjust until it’s close.
Same usage, different plan
$779a year
That is the gap between the cheapest plan you could be on — Electric Residential Service Optional Demand - 507 — and the priciest. Not by using less power. By being billed differently for the same power.
| Plan | Per year | Vs best |
|---|---|---|
| Electric Residential Service Optional Demand - 507Peak hits 2pm–7pm every day, all year. | $898 | — |
| Electric Residential Service Usage Time of Day - 407Peak hits 2pm–7pm every day, all year. | $1,674 | +$776 |
| Electric Residential Service Usage - 400The hour never matters here — only the season. Rates peak June–August. | $1,677 | +$779 |
An estimate, not a quote. Supply charges move month to month, and your real usage pattern is not exactly this one. What it does show reliably is the gap between plans — both are priced off the same assumptions.
Before you switch anything
- What is a time-of-use electricity rate?
The same kilowatt-hour, priced differently depending on when you use it.
- Should you switch to a time-of-use electricity plan?
A wide peak-to-off-peak gap is a lever, not a saving. Levers need something to move.
- How to compare electricity plans without getting it wrong
Six things that break a comparison, and the order to check them in.
Every plan, in detail
Hour-by-hour schedules, tier thresholds, and the tariff each one comes from.
- Electric Residential Service Optional Demand - 507demand charge
Peak hits 2pm–7pm every day, all year.
7.2–12.5¢ - Electric Residential Service Usage - 400flat
The hour never matters here — only the season. Rates peak June–August.
15.1–18.5¢ - Electric Residential Service Usage Time of Day - 407time-of-use
Peak hits 2pm–7pm every day, all year.
15.1–27.3¢