Solar States

Hawaii · homeowner planning guide

Solar panels in Hawaii: costs, incentives & payback

Hawaii pays among the highest electricity prices in the nation and gets about a fifth of its power from solar; net metering ended in 2015, so today nearly every new rooftop system pairs a battery and exports at small credits.

Sun resourceHigh sun resource
Sun (2024)5.69 kWh/m²/day
Federal credit30% (2022–25 installs only)
State incentiveCheck eligibility
Export rulesCheck utility tariff

Guide updated: 2026-09-11. Earlier local source notes dated 2026-08-16. Current program eligibility requires a separate check.

Plan with your own numbers

Solar tools for Hawaii homeowners

Start with the solar calculator using your bill, fixed charges, self-consumption and export-price assumptions. The utility rules below are not automatically applied in the calculator. Utility production charges may need a separate adjustment; this is a planning scenario, not a utility tariff simulation or guaranteed savings.

Estimate solar size and cost in HawaiiCalculate panels for a Hawaii homeEstimate Hawaii solar paybackCheck solar production context for HawaiiEstimate solar panels for EV charging in Hawaii

Before comparing solar quotes in Hawaii

For your Hawaii island and utility, what export option is open to new customers, and which battery services are actually included?

  1. Compare cash cost first. Divide the quoted solar cash price by system size in watts. Keep batteries, roof work and financing fees separate. Compare quotes by cost per watt.
  2. Separate incentives from bill savings. Require written eligibility and approval for each state or utility benefit. A pending application is not a guaranteed payment.
  3. Test the payback assumptions. Use your actual electricity bill and applicable export terms. Estimate your solar break-even year without unconfirmed incentives.

Federal credit: distinguish a past installation from a new one

The IRS states that the residential clean energy credit is not available for property placed in service after December 31, 2025. Paying before that date does not make a later completed installation eligible. A qualifying unused credit from an earlier installation is a separate tax question. Read the IRS credit guidance and installation-deadline FAQ (question 7).

Federal guidance checked 2026-09-11. This is general planning information, not individualized tax advice.

Source checks for Hawaii homeowners

EIA Hawaii energy profile provides state energy context, not a residential installation quote. Confirm current incentives with the administering agency and export terms with the utility named on your bill. These research links are not a confirmation that every local program described in the guide is currently open.

State context and earlier source notes

The notes below retain their recorded source dates. A dated reference is not a current tariff or an incentive approval; check the administering agency before relying on a financial claim.

  • source note 2026-08-16Hawaii's residential electricity prices are the highest among U.S. states, which is why rooftop solar reached exceptional household penetration even with island grid constraints. — U.S. EIA state electricity price tables; SEIA Hawaii solar profile — accessed 2026-08-16
  • source note 2026-08-16Hawaiian Electric and other island utilities shifted from classic NEM to successor tariffs (including customer self-supply and smart export style programs) as daytime solar saturated circuits. — Hawaii PUC distributed energy orders; Hawaiian Electric DG program tariffs; SEIA HI profile — accessed 2026-08-16
  • source note 2026-08-16Hawaii's high irradiance and high rates make batteries economically relevant sooner than in most mainland states — self-consumption and evening peak shaving dominate export revenue. — Hawaii PUC DER dockets; SEIA Hawaii solar profile — accessed 2026-08-16
  • source note 2026-08-16Community-based renewable energy (CBRE) and related shared-solar paths exist for customers who cannot host rooftop arrays, under PUC-approved program rules. — Hawaii PUC CBRE program orders; SEIA Hawaii profile — accessed 2026-08-16
  • source note 2026-08-16Federal 30% Residential Clean Energy Credit applied to qualifying Hawaii systems in service through Dec 31 2025 per the IRS — still stackable with utility program design. — IRS Residential Clean Energy Credit guidance — accessed 2026-08-16

The 30% federal Residential Clean Energy Credit applied to qualifying systems in service by December 31, 2025 — per the IRS, property placed in service after that date does not qualify, so new 2026 installations cannot claim it. State and utility programs change often; the notes above carry their source date. See the federal credit guide.

Questions homeowners ask

Is solar worth it in Hawaii?
Despite losing net metering, Hawaii remains one of the best places for solar because electricity is three to four times the national average and sun is abundant. The winning design is solar plus battery for self-supply: keep the power for your own evening use instead of exporting at small credits. Paybacks are still attractive - systems can pay off in under a decade, often much less at current prices.
Does Hawaii have net metering?
No - HECO ended it in 2015 for new customers. New rooftop systems join customer self-supply (CSS) or customer grid-supply (CGS) programs, which export at very low avoided-cost style credits and strongly favor pairing with storage. The Kauai cooperative (KIUC) runs its own, more generous, programs.
Are there solar incentives in Hawaii?
The state income tax credit may still apply (with caps). The federal Residential Clean Energy Credit applied to qualifying systems placed in service through December 31, 2025 — new installs after that date do not qualify per the IRS. Some utility programs historically offered rebates or bill-credit subscriptions that mostly closed or filled. Solar thermal water heating also has a separate state credit. Confirm the current year's PUC program pages before relying on any single number.
Why is battery storage the norm in Hawaii?
Because the island grids are small and cannot absorb large afternoon exports at retail prices, the regulators shifted to self-supply designs. That means nearly every new rooftop system - more than 90% - now pairs with a battery, and solar-plus- is effectively the only new residential model in the state.
How much does the federal solar credit cover?
The federal Residential Clean Energy Credit covered 30% of qualified costs for systems in service from 2022 through December 31, 2025. Per the IRS, the credit is not available for property placed in service after that date. Hawaii-specific programs are being verified and will appear here as confirmed.
Do I need a battery with solar in Hawaii?
Not always — where utilities pay full-retail net metering, a battery's value is lower. Where net billing cuts export credits, batteries let you shift your own energy into the evening. Your Hawaii utility tariff determines the math.
Can I install solar panels myself in Hawaii?
DIY installs happen, but most utilities require a licensed electrician, permits and an inspection before interconnection. Check Hawaii's permit office and your utility's interconnection rules first.

How to buy solar in Hawaii — the honest version

  1. Model the math first. Get 2–3 quotes in $/W (dollars per watt, before credit) and compare on that number — not on "savings" projections. Use the quote scorecard.
  2. Check your utility's export rules. Retail net metering vs net billing changes whether you want a battery — see the notes above and the battery planner.
  3. Ask about the hidden three: permits, HOA rules and roof condition — walk the 16-question checklist before you sign.
  4. Confirm local sun. Measured 2024 irradiance for Hawaii is on the sun look-up; national literacy starts at the federal credit guide.