Interstate Power and Light Co · IA
When are Interstate Power and Light’s peak hours?
Interstate Power and Light’s peak hours are 2pm–7pm, June–August on all 2 of its time-of-use plans. Everything outside those hours is off-peak, apart from a mid-priced shoulder period.
At peak, Electric Residential Service Optional Demand - 507 charges 12.5¢ a kWh; off-peak it is 7.2¢ — 1.7× apart. Prices from the filed tariff.
These hours only apply if you are on a time-of-use plan. Interstate Power and Light’s default plan, Electric Residential Service Usage - 400, charges one rate at every hour of the day. A household that never switched has no peak hours to avoid — and no cheap hours to use.
What the day looks like on Electric Residential Service Optional Demand - 507
- peak12.53¢
- mid7.73¢
- off-peak7.24¢
Full pricing, eligibility and the annual cost for three households: Electric Residential Service Optional Demand - 507 →
Every Interstate Power and Light plan with peak hours
| Plan | Peak hours | Peak | Off-peak | Weekends |
|---|---|---|---|---|
| Electric Residential Service Optional Demand - 507 | 2pm–7pm, June–August | 12.5¢ | 7.2¢ | partly priced |
| Electric Residential Service Usage Time of Day - 407 | 2pm–7pm, June–August | 27.3¢ | 15.1¢ | partly priced |
Peak and off-peak are the highest and lowest energy prices on each plan; some plans add a shoulder price between them. Fixed monthly charges are not included here — they are on each plan’s page.
What is it worth to move a load out of peak?
On Electric Residential Service Usage Time of Day - 407, every kilowatt-hour a day you move from 2pm to midnight is worth about $41 a year in the month the gap is widest. An electric car charging 10 kWh a night, or a water heater on a timer, is the kind of load that actually moves.
When should you charge an electric car at home? →Where this comes from
Hours and prices are read from the tariff Interstate Power and Light filed with its regulator, as published in the NREL Utility Rate Database, and drawn the same way on every plan page. If your plan is not listed here, either it has no hourly pricing or its filing is too old or too partial for us to price honestly — we leave those out rather than guess.