2026 Rivian R1S Dual Large Plus (20in), ID Charging Cost

What it costs to charge a 2026 Rivian R1S Dual Large Plus (20in) in Idaho

At Idaho's residential electricity rate of 12.8¢/kWh, a 2026 Rivian R1S Dual Large Plus (20in) (rated 43.1 kWh per 100 miles by the EPA) costs $5.52 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 65.5% cheaper per mile than gasoline in Idaho, charging at home costs a fraction of what gas would here.

2026 Rivian R1S Dual Large Plus (20in): yearly cost in Idaho

Home charging this 2026 Rivian R1S Dual Large Plus (20in) in Idaho runs about $828 over fueleconomy.gov's default 15,000 annual miles, versus about $2,403 for the gasoline equivalent. Call it about $1,575 saved annually, at this mileage.

Filling up the 2026 Rivian R1S Dual Large Plus (20in), in dollars

$17.5, that's what Idaho's 12.8¢/kWh rate puts on the 136.7 kWh a 2026 Rivian R1S Dual Large Plus (20in) needs for its full 317-mile EPA range.

How this compares nationally

Among all 20,400 state-and-model combinations this site tracks, charging a 2026 Rivian R1S Dual Large Plus (20in) in Idaho ranks 7,107 for cost savings versus gas, 1 being the best deal nationally. Separately, the Rivian R1S Dual Large Plus (20in) ranks 327 of 400 EV models for raw efficiency, and Idaho ranks 3 of 51 for cheapest residential electricity.

Before you install a home charger in Idaho

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.

Line up a few Idaho electrician quotes for Level 2 install before you commit either way.

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.