How much does it cost to charge a Hyundai Ioniq 9 at home in Washington?
$18.27 for a full charge
- Per 100 miles
- $5.46
- A month at 1,000 miles
- $54.57
- Per mile
- 5.5¢
- Gas at 30 mpg, same miles
- $149.33
2026 Hyundai Ioniq 9 S RWD, EPA 36.6 kWh per 100 miles, at Washington’s average rate of 14.9¢ per kWh (EIA, June 2026). Filling the 110.3 kWh battery from empty takes about 123 kWh from the wall at 90% charging efficiency. How we calculate this
Electricity versus gasoline
| Hyundai Ioniq 9 | Gas car | Difference | |
|---|---|---|---|
| Per 100 miles | $5.46 | $14.93 | $9.48 |
| A month (1,000 mi) | $54.57 | $149.33 | $94.76 |
| A year (12,000 mi) | $654.85 | $1,792.00 | $1,137.15 |
Home charging beats gas for this car as long as electricity costs less than 40.8¢ per kWh. Negative differences mean the gas car is cheaper. The 30 mpg comparison car is our assumption; see the methodology.
What it costs at other monthly mileages
| Miles a month | Energy | Electricity | Gas (30 mpg) |
|---|---|---|---|
| 500 | 183 kWh | $27.29 | $74.67 |
| 750 | 275 kWh | $40.93 | $112.00 |
| 1,000 | 366 kWh | $54.57 | $149.33 |
| 1,500 | 549 kWh | $81.86 | $224.00 |
| 2,000 | 732 kWh | $109.14 | $298.67 |
Charging in Washington compared with other states
Washington’s residential rate is the 13th cheapest of 51 states and DC, 3.4¢ below the US average of 18.3¢ (−19%). Washington’s rate is up 2.0¢ from June 2025 (13.0¢, +15.0%).
Ways to spend less
- Ask your utility about a time-of-use or EV rate and schedule charging for off-peak hours; the car or charger can do it automatically.
- Precondition the cabin while the car is still plugged in, so heating or cooling comes from the grid instead of the battery.
- Keep tires at the pressure on the door-jamb sticker; underinflated tires raise consumption.
- Drive 100 fewer miles a month: saves $5.46 at 14.9¢ per kWh.
Questions
How much does it cost to fully charge a Hyundai Ioniq 9 in Washington?
About $18.27. Filling the 110.3 kWh battery from empty takes about 123 kWh from the wall at 90% charging efficiency. at 14.9¢ per kWh.
How much does it cost to charge a Hyundai Ioniq 9 per month?
About $54.57 a month at 1,000 miles (14.9¢ per kWh), or $654.85 a year in Washington. At the EPA rating of 36.6 kWh per 100 miles, 1,000 miles take 366 kWh from the wall.
How much does it cost to charge a Hyundai Ioniq 9 per mile?
5.5¢ a mile, or $5.46 per 100 miles in Washington.
Is charging a Hyundai Ioniq 9 cheaper than gas?
Yes in Washington: $5.46 per 100 miles against $14.93 for a 30 mpg car at $4.48 a gallon (AAA, September 24, 2026). It stays cheaper as long as electricity costs less than 40.8¢ per kWh.
How many kWh does it take to charge a Hyundai Ioniq 9?
Filling the 110.3 kWh battery from empty takes about 123 kWh from the wall at 90% charging efficiency. Most charging sessions top up part of the battery, so a typical night uses less.
How does charging in Washington compare with other states?
Washington’s residential rate is the 13th cheapest of 51 states and DC, 3.4¢ below the US average of 18.3¢ (−19%). Washington’s rate is up 2.0¢ from June 2025 (13.0¢, +15.0%).
Sources
- EPA rating carrier: S RWD 92 MPGe, 335 mi; SE/SEL AWD 88 MPGe 320 mi; Performance 85 MPGe 311 mi
- EPA rating carrier: All 2026 Ioniq 9 use 110.3 kWh pack
- U.S. EPA and DOE, fueleconomy.gov (official ratings; verify here)
- AAA, national average price of regular gasoline, September 24, 2026
- U.S. Energy Information Administration, Electric Power Monthly, Table 5.6.A: average price of electricity to ultimate customers, residential, June 2026 Figures transcribed from republications of this table on September 26, 2026; pending direct verification from the EIA API.
- Carrier page: June 2026 residential average price, citing EIA Electric Power Monthly Table 5.6.A
Usage assumptions (hours a day, season) are ours and listed on the methodology page. Found an error? Tell us.