Electric Residential Service Optional Demand - 507
When does peak hit on Interstate Power and Light Co’s Electric Residential Service Optional Demand - 507? Peak hits 2pm–7pm every day, all year.
- peak12.53¢
- mid7.73¢
- off-peak7.24¢
What does Electric Residential Service Optional Demand - 507 cost a year?
| Household | Uses | A month | Per year | Works out to |
|---|---|---|---|---|
| Apartment One or two people, no central air, no electric heat | 4,866 kWh | $46 | $556 | 11.4¢ / kWh |
| Family home Three or four people with central air conditioning | 9,453 kWh | $77 | $921 | 9.7¢ / kWh |
| Home with an EV Same house, plus an electric car charging overnight | 13,103 kWh | $99 | $1,190 | 9.1¢ / kWh |
Estimates, not quotes. We run three made-up but realistic households through this tariff hour by hour for a full year — including the way air conditioning loads the afternoon and an EV loads the small hours. Your own bill depends on when you actually use electricity, which is exactly the thing a per-kWh number hides.
What you actually pay
| Period | Rate | Applies when |
|---|---|---|
| peak | 12.53¢ | 2pm–7pm, June–August |
| mid | 7.73¢ | 7pm–2pm, midnight–midnight, June–August |
| off-peak | 7.24¢ | midnight–midnight, September–May |
Plus a fixed charge of $0.5096 per day — so longer months cost more before you use a single kWh.
Should you be on Electric Residential Service Optional Demand - 507?
This plan bills a demand charge on top of the per-kWh rates: a fee tied to your single highest hour of the month. Two homes using the same total electricity can pay very different amounts if one of them runs the dryer, the oven, and the car charger at the same moment. We do not price demand charges yet, so treat every dollar figure on this page as a floor, not a total.
Before a single kilowatt-hour moves, this plan charges $186 a year in fixed fees. On the apartment above that is 33% of the whole bill; on the house with a car charging in it, 16%. Fixed charges are invisible in a cents-per-kWh comparison and they punish small users hardest — if you use very little electricity, the headline rate is the least important number on this page.
Expect the bill to move with the calendar. The same family home costs about $114 in July and $58 in February — a $56 spread driven by heating and cooling far more than by anything you chose. Budget against the July figure, not the average, and a summer bill stops being a surprise.
Other Interstate Power and Light plans
Who can be on Interstate Power and Light’s Electric Residential Service Optional Demand - 507?
Eligibility is not our judgement — it is written into the tariff Interstate Power and Light filed. This is what that document says:
Large General Service Usage customers for all electric uses in one establishment adjacent to an electric distribution circuit of adequate capacity. No resale of service is permitted. Customers on this rate must have energy usage of 20,000 kWh or more in each billing month.
Shortened — the clause runs longer in the filing. Quoted from the filed tariff. Your utility decides eligibility, not us; check with them before you switch.
If this is new to you
- How to read your electric bill
Four kinds of charge, only two of which you can do anything about.
- What is a demand charge on a residential electric bill?
Billed for your worst hour, not your total. Rare on homes, and growing.
- What is critical peak pricing? Peak-day events on your electric bill, explained
A dozen brutally expensive afternoons a year, in exchange for a discount on the other 353 days.
- Why is my electric bill so high in summer?
Usually three causes at once, and only one of them is your air conditioner.
Where this comes from
- Effective
- 2025-07-01
the date this tariff took effect
- Covers
- delivery + supply
the ZIP-code service map lists this territory as bundled, so the utility sells delivery and supply together
- Enrollment
- open to new customers