California home charging cost for the 2027 Rivian R1S Premium (22in)

At California's residential electricity rate of 33.17¢/kWh, a 2027 Rivian R1S Premium (22in) (rated 39.5 kWh per 100 miles by the EPA) costs $13.09 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 cheaper than gas here: 18.3% 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 Premium (22in) costs roughly $1,964 a year to charge at home in California, against roughly $2,403 a year for an equivalent gas car. That's a savings of about $439 a year.

What one full charge costs

Covering the 2027 Rivian R1S Premium (22in)'s EPA-rated 329-mile range takes about 129.9 kWh, which costs about $43.08 at California's residential rate — figured from the EPA's own combined range and consumption numbers, not the pack's nameplate capacity.

Where this ranks

This combination ranks 19,570 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1S Premium (22in) alone ranks 249 of 400 models for efficiency; California alone ranks 50 of 51 states for electricity price.

Before you install a home charger in California

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 California before deciding.

Where these figures come from

The methodology guide names the exact EIA and EPA tables behind this page's numbers. California has some of the highest residential electricity rates in the country — see the guide to why the cost varies so much by state for the full picture.