2026 Rivian R1S Performance Dual Large (22in): home charging cost in Montana

In Montana, home electricity runs 13.77¢/kWh — put a 2026 Rivian R1S Performance Dual Large (22in)'s EPA-rated 39.5 kWh/100mi against that and 100 miles costs $5.44, versus $16.02 for a gas car averaging 25.5 mpg. Charging at home costs a fraction of what gas would here: 66.1% less than gas per mile, here specifically.

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

Driving 15,000 miles a year — fueleconomy.gov's own default assumption — a 2026 Rivian R1S Performance Dual Large (22in) charged at home in Montana costs about $815/year in electricity, against about $2,403/year for the gas-car comparison. That's a savings of about $1,588 a year.

What one full charge costs

A 2026 Rivian R1S Performance Dual Large (22in) needs roughly 129.9 kWh to reach its EPA-rated 329-mile range, which runs about $17.88 at 13.77¢/kWh in Montana.

2026 Rivian R1S Performance Dual Large (22in) in Montana, ranked

This combination ranks 6,632 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1S Performance Dual Large (22in) alone ranks 251 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.

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

Where these figures come from

The methodology guide names the exact EIA and EPA tables behind this page's numbers. Curious how Montana's 13.77¢/kWh compares? The guide to charging cost by state ranks every state side by side.