Solar Calc

Solar Panel Cost in Hawaii (2026 Estimate)

ByIndependent solar research and calculators

Data last updated · ranks #1 of 50 states for modeled payback

Hawaii averages about 5.9 peak sun hours a day (well above the national average) with an approximate residential electricity rate near 42¢/kWh, among the higher rates in the country. In the model used here, an 8 kW system in Hawaii produces roughly 13,780 kWh a year and trims about $5,800 off annual electricity costs, paying back its net cost in about 3.2 years. Strong sun, high electricity prices, or both put Hawaii among the faster paybacks in this comparison, and solar tends to make financial sense here for homeowners with suitable roofs.

Estimated system cost and payback in Hawaii

Costs assume roughly $3.35/watt installed for Hawaii; the net column applies a 30% federal credit for comparison with quotes that include it. Savings and payback use the state's sun hours and rate above.

Modeled solar cost, production, savings and payback in Hawaii by system size
System size Gross cost Net after 30% credit Yearly production Yearly savings Payback
6 kW $20,100 $14,100 10,340 kWh $4,300 3.2 yrs
8 kW $26,800 $18,800 13,780 kWh $5,800 3.2 yrs
10 kW $33,500 $23,500 17,230 kWh $7,200 3.2 yrs

The 30% federal Residential Clean Energy Credit ended for systems paid for after December 31, 2025 under the 2025 federal budget law. Net-after-credit figures apply only if you still qualify (for example a 2025 expenditure, or a leased system where the installer passes a credit through). Confirm with a tax professional.

What moves the numbers in Hawaii

Two inputs drive most of the difference between states: how much sun a system sees and what each offset kilowatt-hour is worth. Hawaii's 5.9 sun hours set production, and its roughly 42¢/kWh rate sets what that production saves. The bigger unknowns are your roof, shading, and how your utility compensates exported power, since a lower export rate can pull real savings below the retail-rate figure above.

Net metering and export credits in Hawaii

Hawaii closed its original net energy metering program to new applicants in October 2015, years ahead of most mainland states, because rooftop solar had already saturated many circuits on Oahu. Legacy NEM customers keep full retail credit for exports, but a home going solar today enrolls in one of the successor programs approved by the Hawaii Public Utilities Commission. Since 2024 the main option at Hawaiian Electric has been the Smart DER program, which replaced Customer Grid-Supply Plus and Smart Export for new applicants.

Under Smart DER, exported energy is credited at rates that differ by time of day, with the most valuable window in the evening peak and a much lower value for midday exports, which is why nearly every new installation on Oahu, Maui and Hawaii Island is paired with a battery. A separate Bring Your Own Device program pays participants for sharing stored energy during peak hours. On Kauai, the KIUC cooperative runs its own purchase arrangements and is not part of the Hawaiian Electric tariffs, so check its current schedule before sizing a system.

Hawaii solar incentives beyond the federal credit

Hawaii's Renewable Energy Technologies Income Tax Credit is one of the more generous state credits still in force: 35 percent of installed cost, capped at $5,000 per single-family residential system, taken in addition to any federal credit you qualify for. Unused credit can be carried forward, and a refundable election at a reduced amount exists for some filers; confirm the current rules with the Hawaii Department of Taxation.

There is no statewide rebate or SREC market, but the state credit combined with electricity prices near 40 cents per kilowatt-hour gives Hawaii some of the shortest payback periods in the country. The Hawaii Green Infrastructure Authority has offered GEMS on-bill financing for eligible households; availability changes, so verify before counting on it.

Utilities and rate plans in Hawaii

Hawaiian Electric serves Oahu, Maui County and Hawaii Island as separate operating companies with separate rates, all among the highest in the nation because much of the generation still burns imported fuel. The Kauai Island Utility Cooperative serves Kauai independently. Hawaiian Electric has been introducing time-of-use pricing, and its fixed monthly customer charge is modest, so most of a bill is the volumetric energy charge that self-consumed solar offsets directly. Because export credits under Smart DER are low during the day, savings depend far more on shifting household use and battery discharge into the evening than on how many kilowatt-hours the roof produces.

City estimates in Hawaii

Sources and methodology

Every figure on this page is computed from two published inputs (average peak sun hours and the state's average residential electricity rate) plus the documented assumptions on the methodology page. It is a transparent model, not a survey of installer quotes. Inputs last reviewed .