Charging a 2026 Rivian R1S Quad Max (22in UHP) at home in Montana

In Montana, home electricity runs 13.77¢/kWh — put a 2026 Rivian R1S Quad Max (22in UHP)'s EPA-rated 47.3 kWh/100mi against that and 100 miles costs $6.52, versus $16.02 for a gas car averaging 25.5 mpg. That works out to 59.3% cheaper per mile than gasoline in Montana — charging at home is much cheaper than gas here.

2026 Rivian R1S Quad Max (22in UHP): yearly cost in Montana

Montana owners putting 15,000 annual miles on a 2026 Rivian R1S Quad Max (22in UHP) spend about $978 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,425 saved annually, at this mileage.

Filling up the 2026 Rivian R1S Quad Max (22in UHP), in dollars

At Montana's rate, fully covering this 2026 Rivian R1S Quad Max (22in UHP)'s 338-mile EPA range costs about $22.04 (160 kWh) — the energy the EPA test actually used, not the battery's rated size.

2026 Rivian R1S Quad Max (22in UHP) in Montana, ranked

Among all 20,400 state-and-model combinations this site tracks, charging a 2026 Rivian R1S Quad Max (22in UHP) in Montana ranks 11,525 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Quad Max (22in UHP) ranks 373 of 400 EV models for raw efficiency, and Montana ranks 10 of 51 for cheapest residential electricity.

Before you install a home charger in Montana

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 Montana before deciding.

More on how this number was built

See the methodology guide for exactly which EIA and EPA figures feed 2026 Rivian R1S Quad Max (22in UHP)'s cost in Montana. At 13.77¢/kWh, Montana sits in the middle of the national range — the guide to why charging cost varies by state shows where.