How much does it cost to charge a Rivian R1S in Washington?

Washington's 12-month average rate, 14.2¢/kWh, is 21% below the U.S. average of 18.0¢/kWh, which saves $1.65 per 100 miles compared with the national rate.

Rates in Washington are rising quickly: the latest 12-month average is 11.9% higher than in the 12 months before, adding $79 a year to the cost of charging the Rivian R1S.

Over the last 24 months Washington was cheapest in winter and most expensive in spring: January 2025 at 11.8¢/kWh and May 2026 at 14.9¢/kWh, which moves the Rivian R1S's monthly charging cost between $51 and $65. The latest published month, August 2026, came in at 14.6¢/kWh, 3% above the 12-month average.

Of the 5 states covered so far, Washington is the cheapest place to charge the Rivian R1S; California is the most expensive at $13.86 per 100 miles.

Among the 10 EVs on OutletBill, the Rivian R1S is the 10th cheapest to charge per mile in Washington, the most expensive we track; the Tesla Model 3 costs $3.45 per 100 miles here.

Of the 3 standard SUVs on OutletBill, the Rivian R1S costs the most to charge in Washington; the Honda Prologue does the same 100 miles for $4.62.

At 42.9 kWh per 100 miles, the 2026 Rivian R1S Dual Standard (20-in) is among the least efficient EVs EPA has rated for 2026: 80% of the 321 versions tested use less energy.

EPA rates the 2026 R1S Dual Standard (20-in) at the same efficiency as the 2025 version, 42.9 kWh per 100 miles, with the same 258-mile range.

Across all 25 trims of the 2026 R1S, cost per 100 miles in Washington ranges from $5.60 for the Dual Large (22-in) to $7.11 for the Quad Max (20-in AT), a difference of $184 a year at 1,016 miles a month.

EPA estimates 9.5 hours to charge the R1S Dual Standard (20-in) from empty on a 240-volt Level 2 home charger, longer than a typical night, though a full charge is rarely needed. At 1,016 miles a month (about 33 miles a day), a day's driving takes roughly 1 hour on a Level 2 charger.

Electricity would have to cost more than 47.0¢/kWh, 3.3 times Washington's rate, before the Rivian R1S cost more per mile than the 2027 BMW X5 40 xDrive. Put the other way, gas would have to fall below $1.58 a gallon.

Gas costs use EIA's Washington retail average for premium gasoline ($5.23 a gallon over the same 12 months, 14% above the U.S. average of $4.58) and the 2027 BMW X5 40 xDrive's EPA rating of 26 mpg combined. EPA lists premium fuel for the 2027 BMW X5 40 xDrive, so the comparison uses premium prices.