Cost to Charge a Hyundai Ioniq 9 in Hawaii

$64.11 for a full charge at 52.72¢/kWh — $20.03 per 100 miles, about $2,404 a year.

Hyundai Ioniq 9 in Hawaii

$64.11 for a full charge

Per 100 miles: $20.03
Per mile: $0.20
Per year: $2,404
vs petrol / yr: -$770

Electricity per year
Petrol per year

The full picture

Charging cost breakdown for a Hyundai Ioniq 9
Item	Energy	Cost
This charge	121.6 kWh	$64.11
Full charge (0–100%)	121.6 kWh	$64.11
Per 100 miles	38.0 kWh	$20.03
Per year (12,000 mi)	4560.0 kWh	$2,404
Same year on petrol (30 mpg)	—	$1,634
Difference	—	-$770

What charging actually costs here

Filling a Hyundai Ioniq 9 from empty in Hawaii costs $64.11. The car draws 121.6 kWh from the wall for a full 320-mile charge, and Hawaii residential electricity averages 52.72¢ per kWh. That works out at $20.03 per 100 miles, or $0.20 a mile.

Hawaii is more expensive than average: 52.72¢ against a national mean of 19.42¢, which ranks it 51 of 51 for electricity price. The same car costs $15.94 to fill in Nevada and $64.11 in Hawaii — a 4.0× spread across the country for identical driving.

This is one of the few places where the sum does not favour electricity. At 52.72¢ per kWh, running the Hyundai Ioniq 9 costs $20.03 per 100 miles while a 30 mpg petrol car costs $13.62 — so over 12,000 miles you would spend about $770 more on electricity. Home solar or an off-peak tariff changes that quickly, but the flat residential rate does not.

Similar EVs in Hawaii

Charging cost of comparable EVs in Hawaii
Vehicle	Per 100 mi	Full charge	Per year
Acura ZDX	37.7 kWh	$64.20	$2,385
Polestar 3	37.5 kWh	$61.68	$2,372
Ford Mustang Mach-E	37.4 kWh	$55.21	$2,366
Genesis Electrified GV70	37.3 kWh	$49.16	$2,360
Porsche Taycan	39 kWh	$60.24	$2,467
Cadillac Lyriq	36.8 kWh	$63.25	$2,328

The same car in nearby-priced states

Charging a Hyundai Ioniq 9 in states with similar electricity prices
State	¢/kWh	Full charge	Per year
Maine	29.59	$35.98	$1,349
Massachusetts	29.61	$36.01	$1,350
California	34.74	$42.24	$1,584

Frequently asked questions

How much does it cost to charge a Hyundai Ioniq 9 in Hawaii?

$64.11 for a full charge from empty. The car needs 121.6 kWh at the wall and Hawaii residential electricity averages 52.72¢ per kWh.

How much does a Hyundai Ioniq 9 cost per mile in Hawaii?

About $0.20 a mile, or $20.03 per 100 miles. Over 12,000 miles a year that is roughly $2,404 of electricity.

Is charging a Hyundai Ioniq 9 cheaper than petrol in Hawaii?

Not at the flat residential rate. Electricity costs $20.03 per 100 miles here against $13.62 for a 30 mpg petrol car, so you would spend roughly $770 more a year. Hawaii has the kind of electricity prices where an off-peak tariff or solar makes the difference.

How long does a full charge last?

The EPA rates the Hyundai Ioniq 9 at 320 miles combined. Cold weather, motorway speeds and a loaded car all reduce that; the EPA number is a standardised test, not a guarantee.

Does this include charging losses?

Yes. The EPA's 38 kWh/100 mi figure is measured at the wall socket, so the energy lost in the charger and cabling is already in the number. No extra efficiency factor is applied.

Vehicle data: EPA fueleconomy.gov, model years 2025-2027. Electricity: EIA Electric Power Monthly Table 5.6.A, residential, June 2026. Petrol: EIA weekly retail gasoline price, 24 August 2026.

Estimates for informational purposes only. Real charging cost depends on your tariff, time of use, charger efficiency, temperature, driving style and state of charge. EPA figures are a standardised test result, not a promise about your car.