Keep the lights on when grids fail
Pick what must run and for how long. We do the math.
16.9 hours
Without power per customer in West Virginia in 2025. US median: 4.3 hours. Source: EIA-861. Size backup for West Virginia →
Specs from manufacturer pagesOutage data from EIA-861Codes from official manualsFormulas in the open
Popular models
Anker SOLIX C1000 Gen 2power station · 1,024 Wh · 2,000 W
Jackery HomePower 3000home battery · 3,072 Wh · 3,600 W
Westinghouse WGen9500DFcgenerator · 9,500 W · dual-fuel
Generac Guardian 24kWstandby generator · 24,000 W · dual-fuelProducts
Most hours without power (2025)
| # | State | Hours per customer |
|---|---|---|
| 1 | West Virginia | 16.9 |
| 2 | Michigan | 11.2 |
| 3 | Nebraska | 9.1 |
| 4 | Alaska | 9.0 |
| 5 | Mississippi | 8.4 |
| 6 | Arkansas | 7.7 |
| 7 | Virginia | 7.7 |
| 8 | Pennsylvania | 7.6 |
| 9 | Kentucky | 6.8 |
| 10 | Washington | 6.4 |
EIA-861, major event days included. All states ranked →
Outages by state: all 50
Quick answers
How long are power outages in the US?
In 2025 the average customer was without power for 4.4 hours over the year, counting major storms; the median state, 4.3 hours. A single outage after a big storm can last days. Outage statistics by state →
How big a battery does a refrigerator need?
A typical fridge uses about 1,008 Wh a day. For 24 hours without power you need a battery of about 1,528 Wh after inverter losses and a reserve, and an inverter that can start its compressor. Fridge sizing →
What size generator do I need for the essentials?
A fridge, router, lights, CPAP and a sump pump peak at 2,357 W when the pump starts, so a generator of at least 2,947 W. Size your own list in the calculator →