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Tariff data · 2026-08-27
← Wisconsin Power & Light Co · WI

Residential Time-of-Use Rg-5 (Single Phase)

When does peak hit on Wisconsin Power & Light Co’s Residential Time-of-Use Rg-5? Peak hits 5pm–9pm in Dec–Feb, 11am–7pm in Jun–Aug — on weekdays.

  • peak27.26¢
  • mid20.06¢
  • off-peak9.82¢
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Every hour of the year at this rate, drawn to scale — 24 hours across, 12 months deep, height is ¢/kWh. The tallest bar is 27.3¢ (Jan, 5pm), the shortest is 9.8¢ (Jan, midnight) — 2.8× apart.
Weekdays
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Weekends
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Weekends are off-peak all day — the cheapest time to run anything you can schedule.

What does Residential Time-of-Use Rg-5 cost a year?

HouseholdUsesA monthPer yearWorks out to
Apartment

One or two people, no central air, no electric heat

4,866 kWh$83$99120.4¢ / kWh
Family home

Three or four people with central air conditioning

9,453 kWh$149$1,79118.9¢ / kWh
Home with an EV

Same house, plus an electric car charging overnight

13,103 kWh$179$2,14916.4¢ / 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

PeriodRateApplies when
peak27.26¢5pm–9pm, December–February; 11am–7pm, June–August
mid20.06¢6am–5pm, 9pm–11pm, December–February; 6am–11pm, March–May, September–November; 6am–11am, 7pm–11pm, June–August
off-peak9.82¢11pm–6am, midnight–midnight

Plus a fixed charge of $0.4932 per day — so longer months cost more before you use a single kWh.

Should you be on Residential Time-of-Use Rg-5?

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 27.3¢ a kWh; at the best hour, 9.8¢ — 2.8× 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 5pm to midnight is about $64 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 $180 a year in fixed fees. On the apartment above that is 18% of the whole bill; on the house with a car charging in it, 8%. 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 $223 in July and $117 in February — a $106 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.

How it compares to Wisconsin Power & Light’s other plans

Measured against the other residential plans this utility files, a family home lands 2nd cheapest of 4. The cheapest option, Residential Service Rg-1 (Single Phase), would run about $58 a year less.

Against Residential Service Rg-1 (Single Phase), which looks like the plan you land on by default, this one comes out $58 more per year (3%). We infer the default from the tariff structure rather than a flag in the data, so confirm it against your own bill before you switch.

Other Wisconsin Power & Light plans

Who can be on Wisconsin Power & Light’s Residential Time-of-Use Rg-5 (Single Phase)?

Eligibility is not our judgement — it is written into the tariff Wisconsin Power & Light filed. This is what that document says:

This schedule is available to all residential customers who use single or threephase service and have measured maximum demands of 75 kW or less for at least 8 out of 12 months and annual energy usage of 250,000 kWh or less. For new customers, the company shall, at its discretion, determine the customer�s demand limits and energy usage until review of 12 month�s service.

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

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.alliantenergy.com/-/media/alliant/documents/accountandbilling/ratesandtariffs/wplresidentialratesummary.pdf?la=en&hash=333E7E05440DFBE1326467A6D92B98BC