Montana home charging cost for the 2027 Rivian R1S Quad (22in)

In Montana, home electricity runs 13.77¢/kWh — put a 2027 Rivian R1S Quad (22in)'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. Charging at home is much cheaper than gas here: 61.9% 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 R1S Quad (22in) costs roughly $916 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 $1,486 a year.

Filling up the 2027 Rivian R1S Quad (22in), in dollars

Covering the 2027 Rivian R1S Quad (22in)'s EPA-rated 374-mile range takes about 166 kWh, which costs about $22.85 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 9,899 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1S Quad (22in) alone ranks 348 of 400 models for efficiency; Montana alone ranks 10 of 51 states for electricity price.

Next step: home charger installation

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.

Get quotes from local electricians for Level 2 charger installation in Montana before deciding.

Where these figures come from

Every figure on this page traces to a named EIA or EPA dataset — see the methodology guide. Montana's 13.77¢/kWh rate ranks 10 of 51 states; the state rate guide lays out the full spread.