Run the dishwasher at 6 p.m. and it might cost you twice as much as running the exact same load after midnight. Not because the machine changed, but because of when you pressed start. That’s the whole idea behind time-of-use electric rates, and in 2026 they’re showing up on more residential bills than ever.

For households that can shift their biggest power draws to off-peak hours, the savings are real. For households that can’t, a time-of-use plan can quietly cost more than the flat rate it replaced. Here’s how the pricing works, what a real utility’s numbers look like, and how to tell which kind of household you are.

How time-of-use pricing works

On a traditional flat rate, a kilowatt-hour costs the same at 5 p.m. on a scorching weekday as it does at 3 a.m. on a Sunday. But it doesn’t cost your utility the same. Demand peaks in the late afternoon and early evening, when everyone gets home, cooks dinner and cranks the air conditioning, and utilities have to buy or generate their most expensive power to cover those hours.

Time-of-use (TOU) rates pass that reality through to your bill. The Department of Energy describes the standard shape of these plans: an afternoon or evening peak period, cheap overnight off-peak hours, and “shoulder” pricing in between. Prices move at set times every day, so you always know the schedule in advance. Most utilities now offer at least one time-varying option, and state regulators publish plain-English guides to them; Colorado’s Public Utilities Commission has a good example.

What the numbers look like at a real utility

Seattle City Light opened a time-of-use rate to residential customers in May 2026, and its price sheet shows the pattern cleanly. Inside Seattle, peak electricity, weekdays and Saturdays from 5 to 9 p.m., costs 16.10 cents per kilowatt-hour. Off-peak power, from midnight to 6 a.m., costs 8.05 cents, exactly half. The remaining hours are billed at a mid-peak price in between, and Sundays and holidays skip peak pricing altogether.

That two-to-one spread between peak and off-peak is common across the country, and some utilities stretch it further in summer. The specific cents-per-kilowatt-hour will differ where you live, but the logic travels: the same appliance, run at a different hour, is billed at a very different price.

Where the savings actually come from

Here’s the honest part: most of your electricity use doesn’t care what time it is. The refrigerator runs all day. Lights come on when it’s dark. TOU savings come almost entirely from the handful of loads that are both large and movable:

Electric vehicle charging is the big one. An EV can draw more overnight than the rest of the house uses all day, and it genuinely does not matter to the car whether it charges at 7 p.m. or 2 a.m. Set the timer once and the discount repeats every night.

Laundry and the dishwasher are the classics. Most machines have a delay-start button that gets used roughly never. On a TOU plan, that button is money.

Electric water heaters can be put on a timer so they do their heavy reheating off-peak. Pool pumps, same story.

What doesn’t move: cooking dinner at dinnertime, and air conditioning on a hot evening, which unfortunately peaks exactly when prices do. You can pre-cool the house in the cheaper afternoon hours and let the thermostat coast through the peak window, which helps, but a household that needs heavy AC from 5 to 9 p.m. gives back a chunk of its off-peak savings.

Who should think twice

A TOU rate is a bet that you can keep your usage out of a four-or-five-hour evening window. Some households shouldn’t take that bet. If someone is home all day and evening running medical equipment, if you heat or cool with electricity and can’t tolerate drifting temperatures, or if your schedule simply plants you in the kitchen and laundry room from 5 to 9 p.m., a flat rate may honestly be the better deal. There’s no virtue prize for being on the fancier rate; the only score that matters is your annual bill.

Renters should also check who controls the big appliances. If the water heater and thermostat aren’t yours to schedule, your movable load may be one dishwasher.

How to find out what your utility offers

Start with your utility’s website or the rate schedule printed on your bill, and search for “time-of-use,” “time-of-day” or “TOU.” You’ll generally need a smart meter, since the utility has to know when you used power, not just how much; most homes have one by now, and the utility can tell you if yours qualifies.

Then ask two questions before you switch. First: does the utility offer a bill-comparison tool that runs your actual past usage through the TOU prices? Seattle’s program, for instance, shows customers a personalized estimate for each rate before they enroll. A projection built on your own kilowatt-hours beats any rule of thumb. Second: what happens if you want out? Some utilities let you switch back anytime; others impose a waiting period before you can re-enroll, Seattle’s is 12 months after leaving, so treat the switch as a considered decision, not an experiment you’ll undo next week.

A fair test before you commit

If the numbers look promising, try living on the schedule for a month before you change anything on paper. Run laundry and the dishwasher off-peak, set the EV timer, pre-cool on hot days. If the routine holds without feeling like a part-time job, you’ll likely keep the savings for years, and the grid quietly benefits too, since every load shifted off the evening peak reduces the strain that drives costs up for everyone. If the routine collapses in week two, you’ve learned the same lesson for free.

This article was produced with AI assistance and reviewed by a human editor. Figures are linked to their primary sources; where a claim could not be verified from the public record, we say so.