Charging a 2026 Rivian R1S Dual Max (20in) at home in Idaho

In Idaho, home electricity runs 12.8¢/kWh — put a 2026 Rivian R1S Dual Max (20in)'s EPA-rated 42 kWh/100mi against that and 100 miles costs $5.37, versus $16.02 for a gas car averaging 25.5 mpg. That works out to 66.5% cheaper per mile than gasoline in Idaho — charging at home costs a fraction of what gas would here.

What a year of driving costs

Idaho owners putting 15,000 annual miles on a 2026 Rivian R1S Dual Max (20in) spend about $806 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,597 saved annually, at this mileage.

What one full charge costs

At Idaho's rate, fully covering this 2026 Rivian R1S Dual Max (20in)'s 380-mile EPA range costs about $20.42 (159.5 kWh) — the energy the EPA test actually used, not the battery's rated size.

Where this ranks

Among all 20,400 state-and-model combinations this site tracks, charging a 2026 Rivian R1S Dual Max (20in) in Idaho ranks 6,287 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Dual Max (20in) ranks 298 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.

Ask a licensed Idaho electrician to quote the install before this math becomes a real decision.

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.