Charging a 2026 Rivian R1S Performance Dual Large Plus (22in) at home in Montana

At Montana's residential electricity rate of 13.77¢/kWh, a 2026 Rivian R1S Performance Dual Large Plus (22in) (rated 40.9 kWh per 100 miles by the EPA) costs $5.63 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 64.8% cheaper per mile than gasoline in Montana — charging at home is much cheaper than gas here.

2026 Rivian R1S Performance Dual Large Plus (22in): yearly cost in Montana

Montana owners putting 15,000 annual miles on a 2026 Rivian R1S Performance Dual Large Plus (22in) spend about $845 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. Call it about $1,558 saved annually, at this mileage.

What one full charge costs

At Montana's rate, fully covering this 2026 Rivian R1S Performance Dual Large Plus (22in)'s 330-mile EPA range costs about $18.59 (135 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 Performance Dual Large Plus (22in) in Montana ranks 7,633 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Performance Dual Large Plus (22in) ranks 279 of 400 EV models for raw efficiency, and Montana ranks 10 of 51 for cheapest residential electricity.

Getting set up to charge a 2026 Rivian R1S Performance Dual Large Plus (22in) 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.

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

More on how this number was built

The methodology guide names the exact EIA and EPA tables behind this page's numbers. At 13.77¢/kWh, Montana sits in the middle of the national range — the guide to why charging cost varies by state shows where.