Wisconsin · Investor Owned · serves 2 ZIP codes
Superior Water and Light Co rate plans
One residential plan is currently open to new customers. It charges different prices depending on the hour, so when you use power changes the bill.
A household using 1,000 kWh a month pays about $1,497 a year on Residential Service Time-of-Day (Single-Phase) ERTD, the only residential plan here — $821 at 500 kWh, $2,850 at 2,000 kWh.
What does Superior Water and Light Co's residential rate cost?
Superior Water and Light Co files a single residential tariff, so there is no plan to choose between — everyone served here is on the same terms. That makes this page short on comparison and long on one question instead: what does that tariff actually do to a bill?
Priced hour by hour across a full year, a small apartment on this tariff comes to about $680 and a three-bedroom house with central air to about $1,209 — an effective 14.0¢ and 12.8¢ per kilowatt-hour once the fixed charge is spread across everything used.
The one lever you do have is timing. This tariff charges 16.0¢ at its most expensive hour and 7.6¢ at its cheapest, so every kilowatt-hour a day moved from 9am to midnight is worth roughly $31 a year. Car charging, a water heater on a timer and laundry are the loads that move; cooking and air conditioning largely are not.
Expect the bill to swing with the weather rather than with anything you decide: the same house costs around $142 in July and $76 in February. Budget against the higher figure and the summer bill stops being a surprise.
How Superior Water and Light compares across Wisconsin
Run the same three-bedroom house with central air through its default plan at each of the 6 Wisconsin utilities we cover, and Superior Water and Light is the cheapest of the lot at about $1,209 a year; the state median is $1,650. The dearest, Wisconsin Electric Power, charges $2,032 for identical use — a gap set by the address, not by anything either household did.
The other two households tell the same story in different sizes: a small apartment pays about $680 here against a state median of $945, and the same house with an electric car charging overnight about $1,487 against $2,211. Effective rate, fixed charge included, is 12.8¢ per kilowatt-hour for the family home.
Every Wisconsin utility we cover, priced for the same three households →
When are Superior Water and Light’s peak hours?
Superior Water and Light’s peak hours are 9am–9pm, March–October. Everything outside those hours is off-peak, apart from a mid-priced shoulder period. Weekends are off-peak all day.
At peak, Residential Service Time-of-Day charges 16.0¢ a kWh; off-peak it is 7.6¢ — 2.1× apart. These hours only matter on a time-of-use plan — the standard plan charges one rate at every hour.
On Residential Service Time-of-Day, every kilowatt-hour a day you move from 9am to midnight is worth about $31 a year in the month the gap is widest — an electric car or a water heater on a timer is the kind of load that actually moves. When to charge an electric car →
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.
Residential Service Time-of-Day (Single-Phase) ERTD
The only residential plan Superior Water and Light currently files that we can price — everything about it is on this page.
When does peak hit on Superior Water and Light Co’s Residential Service Time-of-Day? Peak hits 9am–9pm on weekdays, all year.
- peak15.98¢
- mid15.14¢
- off-peak7.60¢
Weekends are off-peak all day — the cheapest time to run anything you can schedule.
What does Residential Service Time-of-Day 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 | $57 | $680 | 14.0¢ / kWh |
| Family home Three or four people with central air conditioning | 9,453 kWh | $101 | $1,209 | 12.8¢ / kWh |
| Home with an EV Same house, plus an electric car charging overnight | 13,103 kWh | $124 | $1,487 | 11.3¢ / 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 | 15.98¢ | 9am–9pm, March–October |
| mid | 15.14¢ | 9am–9pm, November–February |
| off-peak | 7.60¢ | 9pm–9am, midnight–midnight |
Plus a fixed charge of $12 per month.
Should you be on Residential Service Time-of-Day?
This is a time-of-use plan, which means the clock decides your bill as much as the meter does. At the worst hour you pay 16.0¢ a kWh; at the best hour, 7.6¢ — 2.1× apart for identical electricity.
That gap is worth real money only if you can move load into it. Every kilowatt-hour a day you shift from 9am to midnight is about $31 a year. A dishwasher run is roughly 1.5 kWh; an EV commute charge is 8 to 12. If your day is fixed — you are home in the evening and the air conditioner runs when it runs — a plan like this costs you more, not less.
Before a single kilowatt-hour moves, this plan charges $144 a year in fixed fees. On the apartment above that is 21% of the whole bill; on the house with a car charging in it, 10%. 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 $142 in July and $76 in February — a $65 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.
Who can be on Superior Water and Light’s Residential Service Time-of-Day (Single-Phase) ERTD?
Eligibility is not our judgement — it is written into the tariff Superior Water and Light filed. This is what that document says:
To electric service for residential customers in single-family dwellings for all domestic uses who are eligible for ER1 service.
Quoted from the filed tariff. Your utility decides eligibility, not us; check with them before you switch.
If this is new to you
- When is electricity cheapest? Off-peak hours explained
Overnight, usually. All weekend, often. The exact hours are in your tariff, not in a rule of thumb.
- 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.
- When should you charge an electric car at home?
The single biggest load most homes can move, and the easiest to automate.
- 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
- 2025-01-01
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
Tariff document: https://www.swlp.com/customerservice/electricratesextensionrules