2027 Rivian R1S Performance (20in)

Charging a 2027 Rivian R1S Performance (20in) at home in Montana

At Montana's residential electricity rate of 13.77¢/kWh, a 2027 Rivian R1S Performance (20in) (rated 47 kWh per 100 miles by the EPA) costs $6.47 to drive 100 miles on home charging, against $16.02 for the same distance in a car averaging 25.5 mpg on gasoline at $4.085/gallon. That works out to 59.6% cheaper per mile than gasoline in Montana — charging at home is much cheaper than gas here.

Annual cost, at 15 thousands miles a year

Montana owners putting 15,000 annual miles on a 2027 Rivian R1S Performance (20in) spend about $971 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,432 saved annually, at this mileage.

Filling up the 2027 Rivian R1S Performance (20in), in dollars

At Montana's rate, fully covering this 2027 Rivian R1S Performance (20in)'s 348-mile EPA range costs about $22.52 (163.5 kWh) — the energy the EPA test actually used, not the battery's rated size.

2027 Rivian R1S Performance (20in) in Montana, ranked

Among all 20,400 state-and-model combinations this site tracks, charging a 2027 Rivian R1S Performance (20in) in Montana ranks 11,346 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Performance (20in) ranks 369 of 400 EV models for raw efficiency, and Montana ranks 10 of 51 for cheapest residential electricity.

Getting set up to charge a 2027 Rivian R1S Performance (20in) at home

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 Montana electrician to quote the install before this math becomes a real decision.

More on how this number was built

See the methodology guide for exactly which EIA and EPA figures feed 2027 Rivian R1S Performance (20in)'s cost in Montana. Curious how Montana's 13.77¢/kWh compares? The guide to charging cost by state ranks every state side by side.