What it costs to charge a 2027 Rivian R1S Premium (20in) in Hawaii

At Hawaii's residential electricity rate of 45.95¢/kWh, a 2027 Rivian R1S Premium (20in) (rated 42.9 kWh per 100 miles by the EPA) costs $19.7 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. Here the math runs the other way: 23% more per mile than gasoline, because Hawaii's rate and this model's efficiency combine unfavorably.

What a year of driving costs

Home charging this 2027 Rivian R1S Premium (20in) in Hawaii runs about $2,955 over fueleconomy.gov's default 15,000 annual miles, versus about $2,403 for the gasoline equivalent. At this mileage, that's roughly $552 a year worse than the gas comparison.

Cost of a full charge

$59.1 — that's what Hawaii's 45.95¢/kWh rate puts on the 128.6 kWh a 2027 Rivian R1S Premium (20in) needs for its full 300-mile EPA range.

How this compares nationally

Among all 20,400 state-and-model combinations this site tracks, charging a 2027 Rivian R1S Premium (20in) in Hawaii ranks 20,301 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Premium (20in) ranks 314 of 400 EV models for raw efficiency, and Hawaii ranks 51 of 51 for cheapest residential electricity.

Before you install a home charger in Hawaii

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.

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

More on how this number was built

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.