What it costs to charge a 2026 Rivian R1S All-Terrain Dual Max (20in) in Idaho

A 2026 Rivian R1S All-Terrain Dual Max (20in) draws 43.2 kWh per 100 miles per the EPA; at Idaho's 12.8¢/kWh residential rate that's $5.53 per 100 miles charged at home, versus $16.02 for a 25.5-mpg gas car covering the same distance. That works out to 65.5% cheaper per mile than gasoline in Idaho — charging at home costs a fraction of what gas would here.

What a year of driving costs

Home charging this 2026 Rivian R1S All-Terrain Dual Max (20in) in Idaho runs about $830 over fueleconomy.gov's default 15,000 annual miles, versus about $2,403 for the gasoline equivalent. Call it about $1,573 saved annually, at this mileage.

Cost of a full charge

$20.47 — that's what Idaho's 12.8¢/kWh rate puts on the 159.9 kWh a 2026 Rivian R1S All-Terrain Dual Max (20in) needs for its full 370-mile EPA range.

2026 Rivian R1S All-Terrain Dual Max (20in) in Idaho, ranked

Among all 20,400 state-and-model combinations this site tracks, charging a 2026 Rivian R1S All-Terrain Dual Max (20in) in Idaho ranks 7,105 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S All-Terrain Dual Max (20in) ranks 333 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

The methodology guide names the exact EIA and EPA tables behind this page's numbers. 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.