2027 Rivian R1S Quad (22in UHP): home charging cost in Montana

At Montana's residential electricity rate of 13.77¢/kWh, a 2027 Rivian R1S Quad (22in UHP) (rated 47.3 kWh per 100 miles by the EPA) costs $6.52 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. Charging at home is much cheaper than gas here: 59.3% less than gas per mile, here specifically.

2027 Rivian R1S Quad (22in UHP): yearly cost in Montana

Driving 15,000 miles a year — fueleconomy.gov's own default assumption — a 2027 Rivian R1S Quad (22in UHP) charged at home in Montana costs about $978/year in electricity, against about $2,403/year for the gas-car comparison. That's a savings of about $1,425 a year.

What one full charge costs

A 2027 Rivian R1S Quad (22in UHP) needs roughly 160 kWh to reach its EPA-rated 338-mile range, which runs about $22.04 at 13.77¢/kWh in Montana.

How this compares nationally

This combination ranks 11,523 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1S Quad (22in UHP) alone ranks 371 of 400 models for efficiency; Montana alone ranks 10 of 51 states for electricity price.

Before you install a home charger in Montana

The numbers above assume Level 2 home charging is already in place — the electrical work behind that is a real, separate cost that varies by panel, wiring, and local labor rates, not something this page's per-mile math includes.

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

Where these figures come from

The methodology guide names the exact EIA and EPA tables behind this page's numbers. Montana's 13.77¢/kWh rate ranks 10 of 51 states; the state rate guide lays out the full spread.