Montana home charging cost for the 2027 Rivian R1T Premium Long Range (20in)

At Montana's residential electricity rate of 13.77¢/kWh, a 2027 Rivian R1T Premium Long Range (20in) (rated 42 kWh per 100 miles by the EPA) costs $5.78 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: 63.9% less than gas per mile, here specifically.

Annual cost, at 15 thousands miles a year

At fueleconomy.gov's default of 15,000 annual miles, the 2027 Rivian R1T Premium Long Range (20in) costs roughly $867 a year to charge at home in Montana, against roughly $2,403 a year for an equivalent gas car. That's a savings of about $1,536 a year.

Cost of a full charge

Covering the 2027 Rivian R1T Premium Long Range (20in)'s EPA-rated 380-mile range takes about 159.5 kWh, which costs about $21.96 at Montana's residential rate — figured from the EPA's own combined range and consumption numbers, not the pack's nameplate capacity.

How this compares nationally

This combination ranks 8,400 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1T Premium Long Range (20in) alone ranks 297 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. Curious how Montana's 13.77¢/kWh compares? The guide to charging cost by state ranks every state side by side.