What it costs to charge a 2027 Rivian R1S Premium Long Range (20in) in Montana

In Montana, home electricity runs 13.77¢/kWh — put a 2027 Rivian R1S Premium Long Range (20in)'s EPA-rated 42 kWh/100mi against that and 100 miles costs $5.78, versus $16.02 for a gas car averaging 25.5 mpg. That works out to 63.9% cheaper per mile than gasoline in Montana — charging at home is much cheaper than gas here.

Annual cost, at 15 thousands miles a year

Home charging this 2027 Rivian R1S Premium Long Range (20in) in Montana runs about $867 over fueleconomy.gov's default 15,000 annual miles, versus about $2,403 for the gasoline equivalent. Call it about $1,536 saved annually, at this mileage.

Filling up the 2027 Rivian R1S Premium Long Range (20in), in dollars

$21.96 — that's what Montana's 13.77¢/kWh rate puts on the 159.5 kWh a 2027 Rivian R1S Premium Long Range (20in) needs for its full 380-mile EPA range.

2027 Rivian R1S Premium Long Range (20in) in Montana, ranked

Among all 20,400 state-and-model combinations this site tracks, charging a 2027 Rivian R1S Premium Long Range (20in) in Montana ranks 8,399 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Premium Long Range (20in) ranks 296 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 Premium Long Range (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.

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.