Is solar worth it in Hawaii?

What drives solar payback in Hawaii

Hawaii homeowners pay about 41.1¢/kWh, which is 22.7¢ above the national average. A rooftop here generates roughly 1550 kWh per kW each year — better than the typical US figure. On exports, Hawaii offers partial / below-retail export credit: The highest power prices in the US mean very fast payback even without full export credit.

A worked example

For a Hawaii home with a $360/month power bill (typical household usage at Hawaii’s rate):

That nets out to a payback of about 7.6 years — shorter than simply dividing net cost by year-one savings, because power prices climb ~2.5%/yr so your savings grow each year. Year-one savings already reflect Hawaii’s below-retail export rate (you save full value on the power you use as it’s made, less on what you export), which is why they’re lower than the bill. Assumes 3.00 $/W installed before incentives and a typical 40% self-consumption; your actual cost, roof and usage will differ — adjust the calculator above.

Who supplies your power in Hawaii

Hawaii's grid is small, islanded and dominated by one company. Hawaiian Electric serves roughly 95% of the state through three operating utilities: Hawaiian Electric on Oahu, Maui Electric (MECO) across Maui, Molokai and Lanai, and Hawaii Electric Light (HELCO) on the Big Island. Kauai is different — it is served by the Kauai Island Utility Cooperative (KIUC), a member-owned co-op with its own solar and export rules. There are no mainland-style transmission ties, so each island balances its own supply. That isolation is exactly why Hawaii leaned on expensive imported oil for decades, and why rooftop solar has been so attractive here for so long.

What you’re paid for what you export

Retail net metering is long dead here — traditional 1:1 NEM closed to new applicants back in 2015, and Hawaii has cycled through a series of successor tariffs since. A new residential system today typically enrols in Customer Grid-Supply Plus (CGS+), Smart Export, or a battery-focused scheme such as Bring Your Own Device or Battery Bonus. All of them credit exported energy well below the retail rate — on an avoided-cost or fixed reduced basis — and some pay little or nothing for daytime exports while rewarding evening discharge from a battery. So the money in Hawaii is in self-consumption, not export: size the system to what you actually use, and add storage.

Hawaii incentives & taxes in 2026

Hawaii's own incentive is very much alive: the state Renewable Energy Technologies Income Tax Credit (RETITC) returns 35% of an installed system's cost, capped for residential PV at $5,000 per 5 kW system — a meaningful cut to the net price. Oahu and Maui have also seen Battery Bonus payments for adding storage that discharges during the evening peak, though those programmes fill up and change, so confirm current status before signing anything. Rules shift often here, and the caps and eligibility details matter, so verify the live RETITC terms yourself rather than taking an installer's headline number on trust.

The 30% federal credit ended on 31 December 2025 and can now only reach a homeowner indirectly through a lease or PPA. Check the current state and utility programs on DSIRE’s Hawaii list, then type any incentive into the calculator above to see how it shortens your payback.

What solar costs in Hawaii

$3.50–$4.50 per watt is the price of doing solar mid-Pacific, comfortably above mainland norms: every panel and inverter arrives by ship, island labour is expensive, and permitting adds its share. A 6–8 kW home system runs to low-to-mid five figures before the state credit. A battery — increasingly the sensible default given the export rules — pushes the total higher still, but it's often precisely what makes the economics work.

The honest verdict for Hawaii

Forget selling power back; Hawaii's case is entirely about not buying it. At around 40.7 cents/kWh — the highest power prices in the US — every kilowatt-hour you avoid importing is worth roughly three to four times what a mainland household saves. Pair a right-sized array with a battery so your own generation covers the evening peak, take the 35% state RETITC, and payback comes quickly despite the loss of retail net metering. Hawaii remains one of the strongest payback stories in the country.

Driving electric — or heating electric — in Hawaii?

Your home electricity rate also sets what it costs to charge an EV and whether a heat pump beats a gas furnace. See the Hawaii EV charging cost and the Hawaii heat pump vs gas comparison.

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