Solar panels in Hawaii: cost, payback and the rules that matter
Hawaii homes pay 46.3¢ per kWh for electricity, the highest in the country, up 12.7% in a year. A typical home needs 9 panels. With no federal tax credit they pay for themselves in about 6.6 yrs.
Four facts that decide solar in Hawaii
1. The sun. One kilowatt of panels makes about 1,676 kWh a year in the median Hawaii city, from 1,676 in Honolulu to 1,676 in Honolulu.
2. The price of electricity. Every kWh your panels make is worth what you would otherwise pay: 46.3¢ in Hawaii today.
3. What your utility pays for exports. Hawaii closed retail net metering to new customers in 2015; current programs credit exports well below retail. Source
4. Incentives. The 30% federal Residential Clean Energy Credit (IRC §25D) ended for systems whose installation is completed after December 31, 2025 (One Big Beautiful Bill Act, P.L. We don't know of a statewide income-tax credit for home solar in Hawaii.
Hawaii's homes
492,453 households; 63% own their home. 244,501 owner-occupied single-family houses: the main market for rooftop solar. The median home was built in 1980; 43.1% heat with electricity.
ACS 2020–2024 5-year estimates, U.S. Census Bureau.
Plan a specific Hawaii home
Solar in every Hawaii city with 50,000+ people
| City | Sun hrs/day | kWh per kW | Best tilt | Typical kW | Payback (NM) | Payback (NB) | Solar ¢/kWh |
|---|---|---|---|---|---|---|---|
| Honolulu | 6.0 | 1,676 | 18° | 3.8 | 3.9 yrs | 6.6 yrs | 9.2 |
| Urban Honolulu | 6.0 | 1,676 | 18° | 3.8 | 3.9 yrs | 6.6 yrs | 9.2 |
NM = exports credited at retail (net metering); NB = exports at ~30% of retail (net billing). Systems sized to the Hawaii average home. $3.00/W, cash, 25 years.
Rule changes that affect Hawaii
All changes and deadlines →- Federal: In-service deadline for the lease/PPA solar credit · Tax credits
- Federal: National data: solar prices fell to a median $3.60 per watt · Prices
- Federal: Construction-start deadline passed for the lease/PPA credit · Tax credits
- Federal: The 30% homeowner solar tax credit is gone · Tax credits
Questions about solar in Hawaii
How much do solar panels cost in Hawaii?
A 3.8 kW system, the size the average Hawaii home needs, costs about $9,500 to $14,250 before incentives in 2026.
Is solar worth it in Hawaii?
In the median Hawaii city, solar pays for itself in about 3.9 yrs if exported power earns the retail rate, or 6.6 yrs if it earns about 30% of retail. Hawaii closed retail net metering to new customers in 2015; current programs credit exports well below retail.
Is there a solar tax credit in Hawaii?
We know of no statewide income-tax credit for home solar in Hawaii; utilities and cities sometimes offer rebates. The 30% federal credit ended for homeowner systems installed after December 31, 2025.
How many solar panels does a Hawaii home need?
About 9 panels of 420 watts for the state-average 495 kWh a month. Sunnier cities need fewer: Honolulu gets 1,676 kWh per kW a year, Honolulu 1,676.