Time-of-Use Electricity Rates Explained: How to Actually Save Money

What Are Time-of-Use Rates?

On a standard residential plan, you pay one flat price per kilowatt-hour no matter when you use it. On a time-of-use (TOU) plan, the price changes by time of day: expensive during "peak" hours when the grid is strained, cheap during "off-peak" hours when it isn't.

A typical TOU structure looks like this:

Exact windows and prices vary widely by utility. In California, peak prices can exceed $0.55–$0.60 per kWh while off-peak runs around half that; in other states the spread is narrower but the structure is the same: evenings are expensive, nights are cheap.

Why Utilities Offer TOU Plans

The grid is built for its single worst hour of the year — usually a hot weekday evening when everyone arrives home, turns on the air conditioning, and starts cooking while solar production fades. Serving those peak hours requires expensive "peaker" plants that sit idle most of the time.

TOU pricing is the utility paying you to help: shift your flexible consumption away from that evening crunch and they'll charge you less for it. Several states now default new customers onto TOU plans, and most utilities offer at least one opt-in TOU schedule.

Who Actually Saves on TOU

TOU plans reward people who have large, schedulable loads. In practice that means:

EV owners — the biggest winners

An EV is the most flexible large load a household can own. Charging needs 1–8 hours somewhere in a 12-hour overnight window, and every modern EV (or charger) can schedule itself.

The math is compelling. A driver covering 15,000 miles per year in a typical EV uses roughly 4,000–4,500 kWh for charging:

That last row is the catch: TOU cuts both ways. Plug in at 5 PM without a schedule set and you can pay more than a flat-rate customer. Set the car to start charging at the off-peak hour and you bank the savings automatically. Our EV Charging Cost Calculator models TOU rates directly — enter your off-peak and on-peak prices and it shows your blended cost. For broader context, see our guide to home vs public charging costs.

Home battery owners

A battery turns TOU pricing into an arbitrage opportunity: charge the battery at the off-peak price, run the house on it during peak hours, repeat daily. With a wide peak/off-peak spread, this can save $30–$100+ per month — and it's the core of the economics behind home storage. Our Battery Storage Calculator models exactly this.

Households with shiftable routines

Even without an EV or battery, you can come out ahead by moving the dishwasher, laundry, and water heating outside the peak window — many appliances have built-in delay timers. Households that can't shift anything (everyone home and cooking at 6 PM, electric resistance heat running on winter evenings) often do better staying on a flat rate.

How to Decide: A 15-Minute Checklist

1. Pull your hourly usage data. Most utilities expose it in your online account (look for "Green Button" downloads). See what share of your usage already falls outside peak hours — above ~70% off-peak is a strong TOU candidate.
2. Get the actual rate schedule. Find your utility's TOU price table, including any seasonal differences. The peak/off-peak spread is what matters, not the off-peak price alone.
3. Check for EV-specific plans. Many utilities offer EV-only TOU schedules with extra-cheap overnight windows — sometimes under $0.08/kWh — that beat the standard TOU plan.
4. Look for a rate guarantee. Some utilities offer first-year bill protection when you switch, refunding the difference if TOU costs you more. That makes trying it risk-free.
5. Automate before you switch. Set the EV charge schedule, appliance timers, and thermostat program first. TOU savings come from automation, not willpower.

The Bottom Line

TOU plans are a genuine discount for households that can shift load — and a quiet penalty for those that can't. If you drive an EV, the case is nearly always strong: scheduled overnight charging on the right plan can cut your per-mile fuel cost roughly in half versus a flat rate, which also accelerates the overall economics in our EV vs Gas comparison.