Gas vs. electric driving costs · adjust vehicle and price period below
Why is it like this in Hawaii?
Hawaii has the highest residential electricity rates in the United States — about 39.9¢/kWh — driven by near-total dependence on imported petroleum for power generation. Despite gasoline prices that are also the highest in the country, the per-mile cost of charging exceeds the per-mile cost of gasoline. Hawaii is the only state where this is structural rather than the product of a temporary gas-price spike. Through 2024 and 2025, the math consistently favored filling up. The Iran conflict has temporarily reversed that: with gas now above $5.50/gal, electricity is currently cheaper per mile at conflict-elevated prices — a reversal driven by the gas price spike, not by any improvement in Hawaii's electricity costs. At pre-conflict baseline prices, gasoline is still cheaper, and the structural case for electricity is likely years away.
In the news · Hawaii
Hawaiian Electric, already at ~42¢/kWh (the highest residential rate in the US), was preparing another rate hike for 2026 citing wildfire mitigation and insurance costs — making EV charging in Hawaii the most expensive in the nation and a poor value versus gas for many drivers.
EV registrations have quadrupled in six years in Hawaii yet public charger growth has lagged, with under 1,000 public ports statewide — compounding the cost problem for PHEV drivers who can't rely on cheap home charging at 42¢/kWh.
The Star-Advertiser editorial board assessed HECO's proposed 2027 rate increase, acknowledging wildfire risk and infrastructure costs as legitimate drivers — reinforcing that Hawaii's already-extreme electricity prices are structurally likely to remain the highest in the US.
Curated coverage of Hawaii's EV/PHEV cost, policy, and infrastructure story. External links open in a new tab.
West region comparison
| State | Electric ¢/mi | Gas ¢/mi | Cheaper | Annual diff |
|---|---|---|---|---|
| Washington | 4.2¢ | 10.0¢ | ⚡ Electric | $701/yr |
| Nevada | 4.2¢ | 8.8¢ | ⚡ Electric | $549/yr |
| Oregon | 4.4¢ | 8.8¢ | ⚡ Electric | $519/yr |
| Idaho | 3.7¢ | 7.3¢ | ⚡ Electric | $432/yr |
| Montana | 3.9¢ | 7.2¢ | ⚡ Electric | $398/yr |
| Utah | 3.9¢ | 6.8¢ | ⚡ Electric | $342/yr |
| Wyoming | 3.9¢ | 6.5¢ | ⚡ Electric | $307/yr |
| California | 9.2¢ | 11.1¢ | ⚡ Electric | $228/yr |
| Colorado | 5.0¢ | 6.6¢ | ⚡ Electric | $196/yr |
| Alaska | 7.7¢ | 9.1¢ | ⚡ Electric | $170/yr |
| Hawaii | 12.1¢ | 11.6¢ | ⛽ Gas | $59/yr |