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Hawaii residential electricity costs 41.53¢ per kWh, 131.9% above the national average and the highest in America by a wide margin. Against power that expensive, even the country’s 47th-ranked install price of $3.19 per watt barely slows the math down: a typical Hawaiian system models to the fastest payback in the United States, under 5 years in the best case. The catch is timing. Hawaii retired net metering a decade ago, and today’s export credits vary by hour, so when your household uses its power now matters as much as how much it makes.
Three Prices for the Same Kilowatt-Hour
Under the Smart DER export framework (in place for new Hawaiian Electric interconnections since April 1, 2024, Docket 2019-0323), what a kilowatt-hour of your production is worth depends on where it goes and when. On Oahu, the current values are:
Wondering whether Hawaii prices are high or low for the country? Our state-by-state solar pricing puts them in context.
What Happens to the kWh | Its Value (Oahu) | The Ratio |
|---|---|---|
You use it as it is produced | Retail rate avoided, modeled at the 41.53¢ statewide average | The full prize |
Exported during evening peak hours | 32.9¢ credited | ~80% of retail, the battery’s best friend |
Exported during the day | 13.5¢ credited | A third of retail, the default fate of untimed surplus |
Rates differ by island and change by docket; Maui and Hawaii Island run their own schedules under the same framework, and Kauai’s cooperative (KIUC) sets terms entirely its own. Across islands the order holds: self-use beats evening export beats daytime export, roughly 3-to-1 end to end.
Small Systems, Small Tickets, Huge Rates
Hawaiian households use just 495 kWh a month, the lowest in the nation (no heating, modest cooling, expensive habits long since trimmed), yet pay about $206 monthly, nearly the highest. The typical system is correspondingly tiny: 3.66 kW at about $11,689 gross at the $3.19 benchmark (as of March 1, 2026), producing roughly 5,930 kWh a year in Honolulu-class sun. Rank 47 pricing reflects island logistics; it is also nearly irrelevant against a 41.53¢ rate, which is why Hawaii’s payback embarrasses every mainland market anyway.
Sizes island buyers actually install, gross before incentives, with what each returns from 1,621 kWh per kilowatt of Hawaii sun:
System size | Gross at the $3.19/W benchmark | Island output per year (kWh) |
|---|---|---|
3 kW | $9,570 | About 4,860 |
3.66 kW, the typical Hawaii system | $11,689 | About 5,930 |
4 kW | $12,760 | About 6,480 |
5 kW | $15,950 | About 8,110 |
6 kW | $19,140 | About 9,730 |
See what timing does to your payback
The Fastest Payback in America, Timed Right
If all 5,930 kWh offset the retail rate, modeled at the 41.53¢ statewide average, the year-one value is about $2,465, and the system breaks even in under 5 years. A household that exports its surplus during daytime hours instead drops toward the 13.5¢ credit and stretches the payback toward 8 to 9 years, still faster than almost anywhere on the mainland. The lever between those outcomes is timing: run the water heater, laundry, and charging during production hours, or add a battery that shifts surplus into the 32.9¢ evening window. Hawaii is the one state where storage frequently justifies its cost on export arithmetic alone, before resilience is even counted, though it still deserves its own line-item comparison. Rates climbing 5.98% a year over five years only compress these numbers further.
That model runs on the statewide average, which is ranking context rather than the rate on a Hawaiian Electric bill. Each island files its own residential rate, so pull the per-kWh figure from your own bill and rerun the five-year claim before treating it as yours.
Island Rules Worth Knowing Before You Sign
Legacy program holders (net metering closed October 2015; the CGS and Smart Export programs closed March 29, 2024) keep their existing terms and should protect them: modifications can jeopardize grandfathered status, so get written confirmation from your utility first. New interconnections go through Smart DER, and your installer should show the current export schedule for your island, not Oahu defaults. On Kauai, none of the Hawaiian Electric framework applies; KIUC’s cooperative programs are their own conversation. Leases and PPAs are legal statewide, and with the federal residential credit at $0 for host-owned systems whose installation is completed after December 31, 2025, the third-party route through 48E is worth pricing against ownership, though at Hawaii’s payback speed, ownership usually still wins.
The Short List of Hawaiian No-Gos
- Untimed, oversized arrays. Surplus flowing out at 13.5¢ midday is the one way to make Hawaiian solar mediocre; size to usage and shift load first.
- Proposals quoting Oahu rates on other islands. 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 is irreplaceable; no upgrade is worth losing it without written utility confirmation of the consequences.
- Renters and short stays under 5 years. Even Hawaii’s math needs you present for the payback window.
Hawaii Solar Cost FAQs
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.
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.
No. Net metering closed to new customers in October 2015, and the successor CGS and Smart Export programs closed in March 2024. New interconnections use Smart DER, which credits exports at time-varying rates, about 13.5¢ daytime and 32.9¢ evening peak on Oahu.
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.
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.
Your island, your usage hours, and your roof set the speed. Enter your ZIP code and we will time the math to your household.
Price a system built for island rates
Methodology: Cost figures in this guide use the EcoGen Solar Cost Index for Hawaii, $3.19 per watt as of March 1, 2026, with payback modeled with no federal residential credit for host-owned systems, exports at Smart DER time-varying rates, rate escalation at the model’s 4% cap against the state’s 5.98% 5-year average, 0.5% annual panel degradation, and a 25-year horizon. Oahu export figures cited; island schedules vary.
References & Research Sources
EcoGen America reviewed the Hawaii Public Utilities Commission’s Smart DER framework, Hawaiian Electric export rate sheets, federal electricity price and utility datasets, Census home-value data, federal tax guidance, and state PPA-legality research for this Hawaii solar cost guide. Sources were accessed between June 10 and August 15, 2026, unless another date is listed below.
- Hawaii Public Utilities Commission (PUC). Docket 2019-0323: Smart DER Framework. Program governing new interconnections since April 1, 2024, and the March 29, 2024 closure of the CGS and Smart Export programs. Accessed June 11, 2026.
- Hawaiian Electric. Smart DER Export Program Rate Sheet. Time-of-day export credits by island. Issued February 1, 2025. Accessed June 11, 2026.
- U.S. Energy Information Administration (EIA). Electric Power Monthly, Table 5.6.A. Average residential electricity prices by state, March 2026 edition. Accessed June 10, 2026.
- U.S. Energy Information Administration (EIA). Form EIA-861: Annual Electric Power Industry Report, 2024. Residential customer counts for Hawaiian Electric, Hawaii Electric Light, Maui Electric, and KIUC. Accessed June 10, 2026.
- U.S. Census Bureau. American Community Survey, 2024. Median home value data used for cost-to-value context. Accessed June 11, 2026.
- Internal Revenue Service (IRS). One, Big, Beautiful Bill Provisions. Guidance on Public Law 119-21, including termination of the Section 25D residential credit for systems whose installation is completed after December 31, 2025. Accessed August 15, 2026.
- Database of State Incentives for Renewables & Efficiency (DSIRE). Third-Party Solar PV Power Purchase Agreement Policies, May 2026. State-by-state PPA legality map. Published May 2026. Accessed August 15, 2026.
