What it costs to charge a 2026 Rivian R1S All-Terrain Dual Large (20in) in Montana

In Montana, home electricity runs 13.77¢/kWh — put a 2026 Rivian R1S All-Terrain Dual Large (20in)'s EPA-rated 44.4 kWh/100mi against that and 100 miles costs $6.11, versus $16.02 for a gas car averaging 25.5 mpg. That works out to 61.9% cheaper per mile than gasoline in Montana — charging at home is much cheaper than gas here.

What a year of driving costs

Home charging this 2026 Rivian R1S All-Terrain Dual Large (20in) in Montana runs about $916 over fueleconomy.gov's default 15,000 annual miles, versus about $2,403 for the gasoline equivalent. Call it about $1,487 saved annually, at this mileage.

Filling up the 2026 Rivian R1S All-Terrain Dual Large (20in), in dollars

$17.65 — that's what Montana's 13.77¢/kWh rate puts on the 128.2 kWh a 2026 Rivian R1S All-Terrain Dual Large (20in) needs for its full 289-mile EPA range.

2026 Rivian R1S All-Terrain Dual Large (20in) in Montana, ranked

Among all 20,400 state-and-model combinations this site tracks, charging a 2026 Rivian R1S All-Terrain Dual Large (20in) in Montana ranks 9,903 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S All-Terrain Dual Large (20in) ranks 344 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.

Line up a few Montana electrician quotes for Level 2 install before you commit either way.

More on how this number was built

See the methodology guide for exactly which EIA and EPA figures feed 2026 Rivian R1S All-Terrain Dual Large (20in)'s cost in Montana. Montana's 13.77¢/kWh rate ranks 10 of 51 states; the state rate guide lays out the full spread.