The two numbers that matter
Electricity price: 48.0¢/kWh, above the national state average of 19.3¢. Every kilowatt-hour your panels make replaces one you'd buy at this price, so higher prices mean faster payback.
Sunshine: 5.8 peak sun hours a day, more than the state average of 5.0. Each kW of panels here makes roughly 1,657 kWh a year after real-world losses.
Estimates by bill size
| Monthly bill | Usage | System | Cost | Year-1 savings | Payback | 25-yr net |
|---|---|---|---|---|---|---|
| $100/month | 208 kWh | 1.4 kW | $4,070 | $920 | 5 yrs | $27,220 |
| $150/month | 312 kWh | 2.0 kW | $6,110 | $1,380 | 5 yrs | $40,830 |
| $250/month | 521 kWh | 3.4 kW | $10,180 | $2,300 | 5 yrs | $68,060 |
Assumes $3.00/W installed, 90% usage offset, no federal tax credit, 3% yearly price rise and 0.5% yearly panel degradation. Sources: US Energy Information Administration (EIA), Electric Power Monthly, residential average price, July 2026; NREL PVWatts / NSRDB, average peak sun hours for each state's largest city.
Incentives in hawaii.html
Hawaii offers a 35% state tax credit, capped at $5,000 per system.
The US 30% Residential Clean Energy Credit ended for homeowner systems installed after December 31, 2025. Leased systems and PPAs may still be priced with a federal business credit. See solar incentives in 2026.
Plug-in and balcony solar in hawaii.html
No dedicated plug-in solar law yet as of October 2026. Ask your utility before connecting anything to an outlet; most require an interconnection application. Over 30 states have considered bills, so check back.
Estimate a kit with the plug-in solar calculator.
Next steps
- Check your actual rate on your bill. Many utilities in hawaii.html charge more or less than the state average.
- Run your own numbers in the savings calculator.
- Get at least three quotes and compare the price per watt. Use our quote checklist.
Questions about solar in hawaii.html
Is solar worth it in hawaii.html?
Strong case. Rooftop solar pays back quickly here for most sunny, owner-occupied homes. Get at least three quotes.
How much does a solar system cost in hawaii.html?
At about $3.00 per watt before incentives, a 2.0 kW system costs roughly $6,110. Local quotes vary with roof, equipment and installer.
How many panels would a hawaii.html home need?
For a $150 monthly bill, about 2.0 kW, or roughly 2.3 panels per kW using 430 W panels. Use the system size calculator for your exact usage.