US Electricity kWh Cost & Blackout Load Calculator
Estimate what each US household appliance costs on your monthly utility statement and see how fast it drains a backup LiFePO4 battery station or inverter during a blackout.
Understanding US Utility Rate Structures & Peak Blackout Loads
Time-of-Use (TOU) vs. Flat Residential Tariffs
Utilities in California (PG&E, SCE, SDG&E), Arizona (APS, SRP), and Michigan increasingly bill Peak hours (often 4 PM – 9 PM) at 1.8x to 3x off-peak rates. Shifting electric dryers, pool pumps, and water heaters outside peak periods sharply reduces bill spikes during summer heat domes.
Sizing Essentials for Grid Outages
During a blackout, HVAC heating and cooling dominate household draw. Running only essential loads—refrigerator (~180W duty average), sump pump, router/fiber modem (35W), LED lighting, and medical CPAP—often reduces continuous wattage below 450W, extending portable station autonomy by 8x compared to running 1,500W resistance heaters.
Frequently Asked Questions
US residential electricity rates vary sharply by region according to EIA state averages—from roughly 11.5 to 13 cents/kWh in hydro-rich states like Washington, Idaho, and North Dakota, around 15 cents/kWh in Texas and Florida, up to 24 to 42 cents/kWh in New York, New England, California, and Hawaii.
Multiply running Watts by daily usage hours, divide by 1,000 to obtain daily kilowatt-hours (kWh), then multiply by 30 days and your state electric rate in dollars per kWh (for example, 18 cents/kWh = $0.18).
Under the National Electrical Code (NEC), continuous loads running 3 hours or more should not exceed 80% of a circuit breaker or portable transfer-switch rating. For instance, a 20-amp 120V circuit (2,400VA max) should safely carry up to 1,920W continuously.