Charging a 2026 Rivian R1S All-Terrain Dual Large Plus (20in) at home in Idaho

A 2026 Rivian R1S All-Terrain Dual Large Plus (20in) draws 46.9 kWh per 100 miles per the EPA; at Idaho's 12.8¢/kWh residential rate that's $6 per 100 miles charged at home, versus $16.02 for a 25.5-mpg gas car covering the same distance. That works out to 62.5% cheaper per mile than gasoline in Idaho — charging at home is much cheaper than gas here.

What a year of driving costs

Idaho owners putting 15,000 annual miles on a 2026 Rivian R1S All-Terrain Dual Large Plus (20in) spend about $900 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,503 saved annually, at this mileage.

Cost of a full charge

At Idaho's rate, fully covering this 2026 Rivian R1S All-Terrain Dual Large Plus (20in)'s 292-mile EPA range costs about $17.52 (136.9 kWh) — the energy the EPA test actually used, not the battery's rated size.

How this compares nationally

Among all 20,400 state-and-model combinations this site tracks, charging a 2026 Rivian R1S All-Terrain Dual Large Plus (20in) in Idaho ranks 9,460 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S All-Terrain Dual Large Plus (20in) ranks 365 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

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.