How to Use the Off-Peak Electricity Savings Calculator
Many US electric utilities offer time-of-use (TOU) rate plans that charge less for electricity used during off-peak hours, usually overnight, in exchange for higher rates during peak demand periods. This isn't a single nationwide program — availability, hours, and rates vary by utility and state. This calculator takes your monthly off-peak usage along with your peak and off-peak rates to estimate the savings.
For example, using 300 kWh during off-peak hours at a $0.30/kWh peak rate would cost $90, but at a $0.12/kWh off-peak rate it would cost only $36 — a savings of $54 for that same usage. Actual rates vary widely by provider and region, so check your utility's published TOU rate schedule for exact figures.
Switching to a TOU plan only pays off if you can shift a meaningful share of usage — like EV charging, laundry, or dishwashing — into the off-peak window. If most of your usage happens during peak hours, a TOU plan could actually cost more than a flat-rate plan.
Frequently Asked Questions
No — TOU rate plans are offered by individual utilities and vary by state and provider, not a single nationwide program. Check with your local electric utility to see if a TOU or off-peak plan is available and what hours apply.
Off-peak windows differ by utility, but many plans define off-peak as overnight hours, roughly 9pm to 6am on weekdays plus weekends. Always confirm your exact off-peak hours and rates on your utility's rate schedule.