Time-of-Use Electricity: Pay Less by Timing Your Usage
Quick answer
Time-of-use pricing charges you more per kWh during busy hours and less during slow hours. When you use power matters as much as how much you use. Most US homes pay a flat rate and never see these daily price swings. Utilities offer TOU plans to get customers to shift use away from peak times. Whether TOU saves you money depends on your utility's rate schedule and your daily habits.
What TOU Pricing Actually Is
Most US electricity customers pay a flat rate: one price per kilowatt-hour (kWh) no matter when they run the dishwasher or charge a device. Time-of-use (TOU) pricing works differently. Your utility charges a higher rate during on-peak hours and a lower rate during off-peak hours, so the clock on the wall affects your bill just as much as the number on your meter.
According to the U.S. Energy Information Administration (EIA), most consumers pay prices based on the seasonal average cost of electricity. They do not see prices change from hour to hour. TOU plans are different. Some utilities offer time-of-day pricing to encourage conservation and reduce peak demand.
There are several common residential rate structures. These include simple (flat), tiered (step), time of use, demand rates, tiered within TOU, seasonal, and weekend or holiday rates. TOU is one option among several, not a universal standard.
Why Electricity Costs More at Certain Hours
The grid has to match supply to demand in real time. When millions of people come home in the afternoon and early evening, demand spikes. The EIA notes that electricity demand is usually highest in the afternoon and early evening, so the cost to provide electricity is usually higher at those times.
Meeting that spike requires firing up extra power plants. These are often less efficient “peaker” plants that cost more to run than the baseload plants that hum along all day. That higher generation cost flows through to the on-peak rate on a TOU plan.
Historically, nighttime rates were cheapest because demand dropped after business hours. That pattern is shifting in states with a lot of solar power. As solar generation grows, the lowest-cost electricity moves to midday, when panels produce the most. TOU tariffs can shift consumption out of peak periods, helping the grid handle variable renewable energy sources.
Flat Rate vs. TOU: Common Belief vs. How It Works
| Common belief | What TOU pricing actually does |
|---|---|
| Electricity costs the same per kWh all day | On a TOU plan, the rate per kWh changes by time of day; on-peak hours cost more, off-peak hours cost less |
| A higher bill always means you used more electricity | A bill can rise if more usage shifted into on-peak hours, even if total kWh stayed the same |
| Nighttime is always the cheapest time | In high-solar states, midday can be the cheapest window as solar pushes down midday wholesale prices |
| TOU is the standard rate everyone pays | Most consumers still pay seasonal average flat rates; TOU is an opt-in or utility-specific offering |
Illustrative Bill Calculation: Flat Rate vs. TOU
The following example is illustrative only. It uses hypothetical on-peak and off-peak rates because no specific utility TOU tariff schedule was available in the evidence. Your actual rates will differ; check your utility’s tariff schedule for real figures. The national residential average rate is used as a reference point for the flat-rate scenario.
Scenario: A household uses a set number of kWh in a billing month. Under a flat rate, all kWh cost the same. Under a hypothetical TOU plan, some kWh fall in on-peak hours and the rest fall in off-peak hours.
- Flat rate: 600 kWh × $0.1730/kWh = $103.80
- TOU on-peak: 200 kWh × $0.26/kWh = $52.00
- TOU off-peak: 400 kWh × $0.12/kWh = $48.00
- TOU total: $52.00 + $48.00 = $100.00
In this example, shifting two-thirds of usage to off-peak hours saves about $3.80 compared to the flat rate. If the same 200 kWh stayed on-peak but the remaining 400 kWh also moved to on-peak, the TOU bill would be 600 × $0.26 = $156.00, far above the flat rate. The direction of the difference depends entirely on when you use power, not just how much.
Note: the hypothetical rates above are for illustration only. Actual TOU differentials vary widely by utility and state. For appliance-level cost math, the formula is: kWh = Watts × hours ÷ 1,000.
How TOU Combines With Other Rate Structures
TOU does not always stand alone. Some utilities layer a tiered structure on top of TOU, meaning consumption tiers apply within specific time periods. You might pay a lower on-peak rate for the first block of kWh and a higher on-peak rate once you exceed a baseline allowance, all within the same peak window. Advanced metering infrastructure (smart meters) makes this possible by recording usage hour by hour rather than just totaling the month.
If you are comparing your dishwasher running cost or other appliance costs under a TOU plan, you need two things. First, you need the appliance’s wattage. Second, you need the rate that applies during the hour you run it, not just the average rate on your bill.
Rates Vary Widely by State: Why a National Average Does Not Help You
The EIA reported that in 2025, the annual average retail electricity price ranged from 35.72¢ per kWh in Hawaii to 8.20¢ per kWh in North Dakota. Residential customers averaged 17.30¢ per kWh nationally. These are blended averages across all rate types. A TOU on-peak rate in California will look very different from one in a low-cost Midwestern state.
Electricity prices vary by location based on available power plants, fuel costs, and local pricing rules. In states with deregulated retail markets, your commodity supplier sets the generation rate. The local utility still controls delivery charges. In regulated states, a single utility sets both. This matters when you look at a TOU offer: check whether the time-varying rate applies to the full bill or only the generation portion.
Regulation also shapes who oversees TOU plans. One federal agency oversees wholesale electricity markets and interstate transmission. That agency is the Federal Energy Regulatory Commission (FERC). State-level commissions regulate retail rates within each state. These are called Public Service Commissions (PSC) or Public Utility Commissions (PUC). Your state PUC’s website is the authoritative source for approved TOU tariff schedules in your area.
What This Means for Your Bill: Practical Checks
If your utility offers a TOU plan and you are deciding whether to switch, or if you are already on one and your bill spiked, work through these checks:
- Find your on-peak window. Your utility’s tariff schedule or bill insert will list the exact hours. Common windows are afternoons and early evenings on weekdays, but this varies. Do not assume.
- Calculate your daily average usage by time block. Divide your monthly kWh into on-peak and off-peak buckets using your smart meter’s hourly data, available through most utility online portals.
- Compare kWh in each block, not just dollar totals. A bill spike on a TOU plan may mean more usage shifted into on-peak hours, not that you used more electricity overall.
- Check the billing period length. A 34-day cycle versus a 28-day cycle adds roughly 21% more days of usage regardless of rate type.
- Ask your utility for a bill comparison. Many utilities will show what your bill would have been under a flat rate vs. TOU for the same usage pattern before you commit to switching.
If you cannot shift major loads (such as electric vehicle charging, laundry, or dishwashing) away from on-peak hours, a flat or tiered rate may cost you less than TOU. Budgeting for variable monthly costs is easier on a flat rate, since your bill is more predictable month to month.
If your bill jumped unexpectedly on a TOU plan, do not assume a meter fault or leak right away. Check whether your usage pattern changed (for example, working from home during on-peak hours, or a new appliance running in the afternoon). A higher bill does not always mean a physical problem; it can simply mean more kWh landed in the expensive window.
Frequently asked questions
How do I know if my utility offers a TOU plan?
Check your utility's website or call their customer service line and ask about time-of-use or time-of-day rate options. Your state's Public Utility Commission (PUC or PSC) website also lists approved tariff schedules for all regulated utilities in your state. Not every utility offers TOU, and enrollment rules vary.
Does TOU pricing apply to the whole bill or just part of it?
It depends on your market. In deregulated states, the time-varying rate may apply only to the generation portion of your bill. Delivery and distribution charges stay fixed. In regulated markets, TOU can apply to the combined rate. Read your tariff schedule carefully to see which line items change by time of day.
Can solar panels help on a TOU plan?
Solar panels may help on a TOU plan. In some states, midday rates are lower because solar pushes down wholesale prices at that time. If your panels generate extra power during cheap midday hours but you use grid power during expensive peak hours, net metering credits may offset some peak costs. The benefit depends on your utility's net metering policy and TOU rate structure.
Are weekends usually off-peak on TOU plans?
Many TOU plans treat weekends and holidays as off-peak periods because commercial and industrial demand drops, lowering overall grid load. However, this is not universal. Some utilities apply on-peak rates on weekend afternoons in summer. Always confirm weekend hour classifications in your specific utility's tariff schedule before planning your usage shifts.
What appliances make the biggest difference if shifted to off-peak hours?
High-wattage appliances that run for extended periods have the most impact: electric clothes dryers, dishwashers, electric water heaters, and electric vehicle chargers. Use the formula kWh = Watts times hours divided by 1,000 to estimate each appliance's consumption, then multiply by the on-peak vs. off-peak rate difference to see the potential saving per cycle.
Sources
- Prices and factors affecting prices - U.S. Energy Information Administration (EIA) · eia.gov
- Electric Power Monthly - U.S. Energy Information Administration (EIA) · eia.gov
- Electricity pricing - Wikipedia · en.wikipedia.org
Prepared from these references and checked against them. References retrieved October 11, 2026.
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