Is solar worth it in Hawaii?

Hawaii gets excellent sunshine — about 5.8 peak sun hours a day — and residential electricity runs around $0.41/kWh. For a typical $150-a-month power bill, that points to roughly a 2.6-kW system costing about $7,777 — with no federal tax credit, which ended for installations completed after December 31, 2025 — paying for itself in about 4.3 years and netting on the order of $53,588 over 25 years. Your own numbers will differ — the calculator above uses your real bill.

Hawaii has the highest electricity prices in the nation by far, so solar savings are enormous and payback is often the fastest anywhere — despite high install costs. Grid-export programs are limited, so self-use or a battery maximizes value.

What changes the math in Hawaii

• Your electricity rate — the more you pay per kWh, the more each solar kWh saves you. Hawaii sits at about $0.41.
• Sun hours — more sun means a smaller, cheaper system covers the same usage. Hawaii averages ~5.8 hours.
• Net metering / buyback — how your utility credits power you export swings the payback; check your specific utility's current terms.
• Install cost — quotes vary by installer and roof; the calculator defaults to a typical $/watt you can override.

Hawaii: the rules that actually decide your payback

Who your utility is, and why it matters

Hawaiian Electric (Oʻahu), Hawaiʻi Island's Hawaiian Electric Light, Maui Electric, and the Kauaʻi Island Utility Cooperative split the islands. Hawaii closed retail net metering in 2015 and replaced it with a sequence of successor programs, so the rules depend on when your system interconnected and which island you are on.

What your exported power is worth

The Smart Renewable Energy Export program is the current successor, open to all renewable technologies with no project-size limit. Export-credit rates are fixed for five years and vary by island: about 10.1¢/kWh on Oʻahu, 10.6¢ on Hawaiʻi Island, 12.2¢ on Maui, 16.8¢ on Molokaʻi, and 20.8¢ on Lānaʻi. Against Hawaii's nation-leading retail rates (often 40¢+), every exported kilowatt-hour is a significant loss versus one you self-consume.

The Hawaii incentive layer

There is no state income-tax credit for panels (the state's 35% credit ended years ago), but Hawaii's electricity prices themselves are the incentive: offsetting power at 40¢+ gives the fastest payback math in the country even without any state programme. The sales-tax exemption on solar equipment under the state's renewable-energy infrastructure exemption also applies.

Battery and self-consumption

Hawaii is the definitive battery state. With exports crediting at roughly a quarter of retail, the economics overwhelmingly favor storing your own production for evening use. Hawaiian Electric's Smart DER and Battery Bonus programs have paid upfront per-kilowatt incentives for batteries enrolled in grid services, turning storage from a cost into a revenue line on the right tariff.

What to check on a Hawaii quote

• Ask which successor program the quote models — Smart Export, Smart Renewable Energy Export, or Battery Bonus — the fixed credit rates differ by island and lock in for five years.
• If a battery is quoted, ask whether any utility incentive (Battery Bonus or Smart DER enrolment) is applied, at what per-kW rate, and whether it requires grid-service participation.
• Confirm the model uses your actual island's export rate; a quote using Oʻahu's rate on Maui understates your export income by 20%.
• Ask whether the system will be on the utility's export-control list — some programs cap how much a system can send back during peak-sun hours.

Programme and tariff detail above is summarised from Hawaii Public Utilities Commission — Smart Export, CGS+ and Battery Bonus. Last reviewed 20 August 2026 by SolarDime editorial. These rules change — confirm the current terms with your utility and the regulator before you sign.