What it costs to charge a 2026 Rivian R1T Dual Large (20in) in Idaho

At Idaho's residential electricity rate of 12.8¢/kWh, a 2026 Rivian R1T Dual Large (20in) (rated 42.9 kWh per 100 miles by the EPA) costs $5.49 to drive 100 miles on home charging, against $16.02 for the same distance in a car averaging 25.5 mpg on gasoline at $4.085/gallon. That works out to 65.7% cheaper per mile than gasoline in Idaho — charging at home costs a fraction of what gas would here.

2026 Rivian R1T Dual Large (20in): yearly cost in Idaho

Home charging this 2026 Rivian R1T Dual Large (20in) in Idaho runs about $823 over fueleconomy.gov's default 15,000 annual miles, versus about $2,403 for the gasoline equivalent. Call it about $1,580 saved annually, at this mileage.

Filling up the 2026 Rivian R1T Dual Large (20in), in dollars

$16.46 — that's what Idaho's 12.8¢/kWh rate puts on the 128.6 kWh a 2026 Rivian R1T Dual Large (20in) needs for its full 300-mile EPA range.

How this compares nationally

Among all 20,400 state-and-model combinations this site tracks, charging a 2026 Rivian R1T Dual Large (20in) in Idaho ranks 6,927 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1T Dual Large (20in) ranks 318 of 400 EV models for raw efficiency, and Idaho ranks 3 of 51 for cheapest residential electricity.

Next step: home charger installation

Everything above is the per-mile and per-year cost once a home charger exists — getting one installed is a separate electrical job whose price depends on your panel and wiring, not the state average used here.

Get quotes from local electricians for Level 2 charger installation in Idaho before deciding.

More on how this number was built

Every figure on this page traces to a named EIA or EPA dataset — see the methodology guide. Idaho is one of the cheapest states for home electricity — the guide to why the cost varies so much by state covers what drives that.