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

A 2027 Rivian R1S Premium (20in) draws 42.9 kWh per 100 miles per the EPA; at Delaware's 17.74¢/kWh residential rate that's $7.61 per 100 miles charged at home, versus $16.02 for a 25.5-mpg gas car covering the same distance. That works out to 52.5% cheaper per mile than gasoline in Delaware — charging at home is much cheaper than gas here.

Annual cost, at 15 thousands miles a year

Home charging this 2027 Rivian R1S Premium (20in) in Delaware runs about $1,141 over fueleconomy.gov's default 15,000 annual miles, versus about $2,403 for the gasoline equivalent. Call it about $1,262 saved annually, at this mileage.

What one full charge costs

$22.82 — that's what Delaware's 17.74¢/kWh rate puts on the 128.6 kWh a 2027 Rivian R1S Premium (20in) needs for its full 300-mile EPA range.

2027 Rivian R1S Premium (20in) in Delaware, ranked

Among all 20,400 state-and-model combinations this site tracks, charging a 2027 Rivian R1S Premium (20in) in Delaware ranks 14,372 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 Delaware ranks 33 of 51 for cheapest residential electricity.

Before you install a home charger in Delaware

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.

Ask a licensed Delaware electrician to quote the install before this math becomes a real decision.

More on how this number was built

The methodology guide names the exact EIA and EPA tables behind this page's numbers. Curious how Delaware's 17.74¢/kWh compares? The guide to charging cost by state ranks every state side by side.