Charging a 2027 Rivian R1S Performance (20in AT) at home in California

A 2027 Rivian R1S Performance (20in AT) draws 49.8 kWh per 100 miles per the EPA; at California's 33.17¢/kWh residential rate that's $16.53 per 100 miles charged at home, versus $16.02 for a 25.5-mpg gas car covering the same distance. Here the math runs the other way: 3.2% more per mile than gasoline, because California's rate and this model's efficiency combine unfavorably.

Annual cost, at 15 thousands miles a year

California owners putting 15,000 annual miles on a 2027 Rivian R1S Performance (20in AT) spend about $2,480 on home electricity, compared to about $2,403 a gas-car equivalent would spend on fuel. At this mileage, that's roughly $77 a year worse than the gas comparison.

Cost of a full charge

At California's rate, fully covering this 2027 Rivian R1S Performance (20in AT)'s 329-mile EPA range costs about $54.38 (164 kWh) — the energy the EPA test actually used, not the battery's rated size.

2027 Rivian R1S Performance (20in AT) in California, ranked

Among all 20,400 state-and-model combinations this site tracks, charging a 2027 Rivian R1S Performance (20in AT) in California ranks 20,134 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Performance (20in AT) ranks 386 of 400 EV models for raw efficiency, and California ranks 50 of 51 for cheapest residential electricity.

Next step: home charger installation

Everything above is the per-mile and per-year cost once a home charger exists — getting one installed is a separate electrical job whose price depends on your panel and wiring, not the state average used here.

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

More on how this number was built

Every figure on this page traces to a named EIA or EPA dataset — see the methodology guide. This is one of the combinations where charging costs more than gas — the guide to when that happens explains why the arithmetic can go either way.