California home charging cost for the 2027 Rivian R1S Quad (20in AT)

A 2027 Rivian R1S Quad (20in AT) draws 50.1 kWh per 100 miles per the EPA; at California's 33.17¢/kWh residential rate that's $16.62 per 100 miles charged at home, versus $16.02 for a 25.5-mpg gas car covering the same distance. This model costs more to charge at home than gas would here: 3.7% more than gas per mile here, not less — the arithmetic isn't clamped to always favor charging.

Annual cost, at 15 thousands miles a year

At fueleconomy.gov's default of 15,000 annual miles, the 2027 Rivian R1S Quad (20in AT) costs roughly $2,493 a year to charge at home in California, against roughly $2,403 a year for an equivalent gas car. That's about $90 MORE a year than the gas comparison, not less.

What one full charge costs

Covering the 2027 Rivian R1S Quad (20in AT)'s EPA-rated 325-mile range takes about 162.8 kWh, which costs about $54.01 at California's residential rate — figured from the EPA's own combined range and consumption numbers, not the pack's nameplate capacity.

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

This combination ranks 20,142 of 20,400 state/model pairs for cost savings against gas (1 is cheapest). The Rivian R1S Quad (20in AT) alone ranks 390 of 400 models for efficiency; California alone ranks 50 of 51 states for electricity price.

Getting set up to charge a 2027 Rivian R1S Quad (20in AT) at home

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 California 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. 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.