Solar in Hawaii costs about $3.19 per watt, so the typical 3.66 kW system runs about $11,675 before incentives. Against 41.53¢ power, the highest rate in America, that can pay back in under 5 years, but only if your home uses its power while the panels make it.
See what timing does to your payback
In Hawaii, when your household uses power matters as much as how much the panels make. Your ZIP code shows local prices and installers.
The form asks about your home first, then your contact details. EcoGen or its installer partners may contact you.
- Free, no-obligation quotesRequest quotes from local installers in minutes. You decide if you go ahead.
- Pre-screened installers onlyWe check every partner before they join and keep monitoring them after.
- Your details come lastFour quick questions about your home first. Name, email and phone only at the end.
41.53¢, 32.9¢ or 13.5¢: what one Hawaii kilowatt-hour earns
New Hawaiian Electric systems connect under Smart Renewable Energy Export, its name for the Smart DER Export tariff (in place since April 1, 2024, Docket 2019-0323). What a kilowatt-hour of your power is worth depends on where it goes and when.
The order holds on every islandMaui and Hawaii Island run their own schedules under the same framework. Across islands, self-use beats evening export beats daytime export, roughly 3 to 1 end to end.
Kauai is a separate caseKauai’s cooperative, KIUC, sets its own solar terms. None of the Hawaiian Electric figures above apply there.
Timed right, Hawaii solar pays back faster than anywhere in the US
If all 5,930 kWh a typical system makes each year offset the 41.53¢ statewide average, the system breaks even in under 5 years. A household that exports its surplus in daylight earns closer to 13.5¢ on it, and payback stretches toward 8 to 9 years. That is still faster than almost anywhere on the mainland.
Move your loads into the sunRun the water heater, the laundry and car charging while the panels produce. Or add a battery that moves surplus into the 32.9¢ evening window. Hawaii is the one state where storage often pays for itself on export math alone, before backup power is even counted. It still deserves its own line-item comparison.
Rerun it with your own billThe model uses the statewide average, which is ranking context, not the rate on a Hawaiian Electric bill. Each island files its own residential rate. Take the per-kWh figure from your own bill and redo the math before you treat the 5-year figure as yours.
Small Hawaii systems, small tickets, what each one makes
Hawaii households use just 495 kWh a month, the lowest in the nation, yet pay about $206 a month, nearly the highest. So the typical system is tiny: 3.66 kW for about $11,675 at $3.19 per watt. The price ranks 47th in the country because of island logistics. Against a 41.53¢ rate, that barely matters. For the national picture, see our state-by-state solar pricing.
Gross prices at $3.19 per watt, before incentives. Output uses 1,621 kWh per kilowatt a year in Honolulu-class sun. Real quotes vary by island, roof and installer.
Grandfathered, Smart DER or KIUC: the Hawaii rules that apply to you
No federal credit for a system you ownThe federal residential credit is $0 for host-owned systems whose installation is completed after December 31, 2025. With a lease or PPA, legal statewide, the owner can claim the Section 48E credit. That route is worth pricing, though at Hawaii’s payback speed, owning usually still wins.
Net metering closed in October 2015, CGS in November 2017, and CGS Plus and Smart Export on March 29, 2024. Holders keep their terms, but changes to the system can put them at risk. Get written confirmation from your utility first.
New interconnections use time-varying export credits. Your installer should show the current export schedule for your island, not Oahu defaults.
None of the Hawaiian Electric framework applies. KIUC’s cooperative programs are their own conversation.
Four ways to turn Hawaii’s best-in-class payback into a mediocre one
Skip or rethink the deal if any of these describe it:
- An untimed, oversized array. Surplus flowing out at 13.5¢ at midday is the one way to make Hawaii solar mediocre. Size to your usage and shift your loads first.
- A proposal quoting Oahu rates on another island. Each island’s schedule differs. A quote that does not name your island’s current figures is not a quote.
- Touching a grandfathered system casually. Legacy net metering from 2015 cannot be replaced. No upgrade is worth losing it without written utility confirmation of what happens.
- Renting, or staying under 5 years. Even Hawaii’s math needs you there for the payback window.
Price a system built for island rates
Your island, your usage hours and your roof set the speed. Enter your ZIP code and we will time the math to your household.
- Quotes built for your roofEach quote is designed around your home and your bills.
- Installers we keep checkingPartners are screened before they join and monitored after.
- No cost, no pressureComparing quotes is free, and you are never obliged to sign.
Further reading before you price a Hawaii roof
Frequently asked questions
How much do solar panels cost in Hawaii in 2026?
About $3.19 per watt installed, rank 47 nationally, as of March 1, 2026. Because Hawaiian households use so little electricity, the typical system is just 3.66 kW, about $11,700 before incentives, one of the smallest tickets in the country.
What is the solar payback period in Hawaii?
The fastest in America: under 5 years in the best case, because production offsets 41.53¢ power. Untimed daytime exports at 13.5¢ stretch it toward 8 to 9 years, which is why load timing and batteries matter more in Hawaii than anywhere else.
Does Hawaii have net metering?
No. Net metering closed to new customers in October 2015, CGS closed in November 2017, and the successor CGS Plus and Smart Export programs closed in March 2024. New interconnections use Smart Renewable Energy Export (the Smart DER Export tariff), which credits exports at time-varying rates, about 13.5¢ daytime and 32.9¢ evening peak on Oahu.
Is a battery worth it in Hawaii?
Usually, yes, and on economics alone. Storage moves surplus from the 13.5¢ daytime credit into self-use at 41.53¢ or the 32.9¢ evening window, a swing large enough that Hawaii is the one state where batteries frequently pay for themselves before resilience is counted.
Are the rules different on Kauai?
Completely. Kauai is served by the KIUC cooperative, which sets its own solar programs outside the Hawaiian Electric Smart DER framework. Kauai households should work from KIUC’s current terms, not the Oahu figures on this page.
How we calculate these costs
Cost figures use Hawaii’s entry in the EcoGen Solar Cost Index (v2 method): $3.19 per watt, as of March 1, 2026. Payback assumes no federal residential credit for host-owned systems, exports at Smart DER time-varying rates, rate growth at the model’s 4% cap against the state’s 5.98% 5-year average, 0.5% yearly panel degradation and a 25-year horizon. Export figures are for Oahu; island schedules vary.
Sources (7)
- Hawaii Public Utilities Commission, Docket 2019-0323: Smart DER Framework (accessed June 11, 2026): puc.hawaii.gov
- Hawaiian Electric, Smart DER Export Program Rate Sheet (issued February 1, 2025): hawaiianelectric.com
- U.S. Energy Information Administration, Electric Power Monthly, Table 5.6.A (March 2026 edition): eia.gov
- U.S. Energy Information Administration, Form EIA-861, 2024: eia.gov
- U.S. Census Bureau, American Community Survey, 2024: census.gov
- IRS, One, Big, Beautiful Bill Provisions (Public Law 119-21): irs.gov
- DSIRE, Third-Party Solar PV Power Purchase Agreement Policies (May 2026): ncsolarcen-prod.s3.amazonaws.com
