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EV vs gas cost in Idaho: $1,218 a year saved at 12,000 miles
With Idaho electricity at 12.96¢/kWh and regular gasoline at $4.47/gal, a typical EV (0.3 kWh/mile, charged 80% at home) costs about 5.8¢ per mile to run versus 16.0¢ per mile for a 28 mpg gas car. That beats gas by $1,218 a year at 12,000 miles. Idaho ranks #6 of 51 (50 states + DC) for annual savings and #3 for lowest residential electricity price.
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What the Idaho numbers say
- Electricity: Idaho residential average is 12.96¢/kWh year-to-date through July 2026, 29% below the U.S. average of 18.19¢. It is up 12.0% from the same period in 2025. Latest single month (July 2026): 13.73¢.
- Gasoline: $4.47/gal (EIA regional series: Rocky Mountain (PADD4)), up $1.47 from a year ago. The U.S. average is $4.28.
- Cost-equivalent MPG: a gas car would need about 77 mpg to cost the same per mile as this EV in Idaho.
- If prices move: at 20% cheaper gas ($3.57) the yearly EV saving would be $835; at 20% higher electricity (15.55¢) it would be $1,143.
What this leaves out: purchase price, tax credits, insurance, maintenance, depreciation, home charger installation, time-of-use rates and cold-weather range loss. Your utility's own rate may differ from the state average. See the methodology.
Cost to run common things in Idaho
- Space heater (1,500 W): $0.19 per hour
- Electric blanket (200 W): $0.21 per 8-hour night
- Window air conditioner (1,000 W): $0.13 per hour
- Electric clothes dryer: $0.39 per load
- Dishwasher: $0.13 per load
- Refrigerator: $58 per year
- Gaming PC (300 W under load): $0.04 per hour
- EV home charging (per 100 miles): $3.89 per 100 miles
Heating this winter? In Idaho a heat pump costs about $15.19 per million BTU of heat vs $7.42 for a gas furnace and $29.77 for propane. Heat pump vs furnace in Idaho.