What it costs to charge a 2027 Rivian R1S Premium (22in) in Idaho

A 2027 Rivian R1S Premium (22in) draws 39.5 kWh per 100 miles per the EPA; at Idaho's 12.8¢/kWh residential rate that's $5.05 per 100 miles charged at home, versus $16.02 for a 25.5-mpg gas car covering the same distance. That works out to 68.5% 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 2027 Rivian R1S Premium (22in) in Idaho runs about $758 over fueleconomy.gov's default 15,000 annual miles, versus about $2,403 for the gasoline equivalent. Call it about $1,645 saved annually, at this mileage.

Cost of a full charge

$16.62 — that's what Idaho's 12.8¢/kWh rate puts on the 129.9 kWh a 2027 Rivian R1S Premium (22in) needs for its full 329-mile EPA range.

Where this ranks

Among all 20,400 state-and-model combinations this site tracks, charging a 2027 Rivian R1S Premium (22in) in Idaho ranks 4,718 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Premium (22in) ranks 249 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.

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

More on how this number was built

See the methodology guide for exactly which EIA and EPA figures feed 2027 Rivian R1S Premium (22in)'s cost in Idaho. 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.