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

A 2027 Rivian R1S Premium (20in AT) draws 44.4 kWh per 100 miles per the EPA; at Hawaii's 45.95¢/kWh residential rate that's $20.38 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: 27.2% more per mile than gasoline, because Hawaii's rate and this model's efficiency combine unfavorably.

Annual cost, at 15 thousands miles a year

Home charging this 2027 Rivian R1S Premium (20in AT) in Hawaii runs about $3,058 over fueleconomy.gov's default 15,000 annual miles, versus about $2,403 for the gasoline equivalent. At this mileage, that's roughly $655 a year worse than the gas comparison.

What one full charge costs

$58.91 — that's what Hawaii's 45.95¢/kWh rate puts on the 128.2 kWh a 2027 Rivian R1S Premium (20in AT) needs for its full 289-mile EPA range.

Where this ranks

Among all 20,400 state-and-model combinations this site tracks, charging a 2027 Rivian R1S Premium (20in AT) in Hawaii ranks 20,333 for cost savings versus gas — 1 being the best deal nationally. Separately, the Rivian R1S Premium (20in AT) ranks 342 of 400 EV models for raw efficiency, and Hawaii ranks 51 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 Hawaii 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.