HI · ranked #1 in the US
Hawaii residential rate: 41.2¢/kWh
That's 150% higher than the US average of 16.5¢/kWh. Island grids can't interconnect; imported petroleum historically fueled most generation. Oahu, Maui, and Big Island rates vary meaningfully around this weighted state average.
Estimated cost
$139.05/month
$4.64 per day$1,691.78 per year337.5 kWh monthly
W
A space heater draws full power only while the thermostat/compressor is running — about 7.5 effective hours at 1500W across your 10-hour window.
At your rate
What appliances cost in Hawaii.
Typical monthly running cost at 41.2¢/kWh, sorted by biggest impact on your bill.
Utilities serving Hawaii
- Hawaiian Electric (HECO)
- Maui Electric
- Hawaii Electric Light (HELCO)
- Kauai Island Utility Cooperative
Deregulation status
none
In Hawaii your utility is both the supplier and the deliverer. No supplier shopping, but regulated rates tend to be more stable.
Sources: www.eia.gov · puc.hawaii.gov
Last updated: 2026-04-13