Solar Panel Cost in Honolulu, HI 2026: ~9.0-Year Payback
In Honolulu, HI, an 8 kW system at $3.39/W produces about 1,610 kWh per kW and pays back in roughly 9.0 years at 42.87¢/kWh with the federal credit at $0.
· Source: EIA Electric Power Monthly Table 5.6.A (July 2026 data) · next EIA update ~Oct 23
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- Honolulu production
- 1,610 kWh/kW/yr
- Hawaii average
- 1,550 kWh/kW/yr
- Electricity rate
- 48.0¢/kWh
- 8 kW installed cost
- ~$27,120
- 2026 federal credit
- $0
- Payback (utility math)
- 9.0 years
Why this number
At 1,610 kWh per kW and Hawaiian Electric’s 42.87¢/kWh, Honolulu produces one of the fastest paybacks on this site: about 9.0 years on an 8 kW system, even though Hawaii’s installed cost of $3.39/W is the highest in the country and the federal credit is $0. Note that Honolulu is above the Hawaii state band of 1,550 — the state figure is an Oahu urban mean, dragged down by windward Kaneohe at 1,157.
An 8 kW system in Honolulu, priced out
| Metric | Estimate for Honolulu | Hawaii statewide |
|---|---|---|
| Production, unshaded 20° south | 1,610 kWh per kW/yr | 1,550 kWh per kW/yr |
| 8 kW output after a 10% roof derate | ~11,592 kWh/yr | ~11,160 kWh/yr |
| Average residential rate | 48.0¢/kWh (EIA) | 48.0¢/kWh |
| Installed cost, 8 kW | ~$27,120 at $3.39/watt | ~$27,120 |
| 2026 federal credit | $0 | $0 |
| Export rule | Net billing — exports credited below retail | Net billing — exports credited below retail |
| Export credit modeled | 13.50¢/kWh | 13.50¢/kWh |
| Annual value of that output | ~$3,165 | ~$3,047 |
| Rough payback (your utility) | 9.0 years | 8.6 years (state-average model) |
| 25-year net position | $68,332 | — |
Only the first two rows differ. Everything financial — rate, tariff, price per watt — is inherited from Hawaii without change, which is the point: a city page that quietly used a different electricity rate from its state page would be guessing, not measuring.
Doing nothing is not free either. Twenty-five years of the electricity an 8 kW Honolulu array would produce, with rates rising at 2.5% a year, comes to roughly $190,054.
Electricity isn’t only for panels — the heat pump vs. furnace cost calculator compares heating costs at Honolulu’s own 48.0¢/kWh rate.
Run it with your own bill
Shared methodology · identical on every city page
- Production figures are unshaded, south-facing, 20° PVGIS values. A real roof — its own pitch, orientation, a tree or a chimney — typically produces 10–25% less; every payback here already carries a 10% real-roof derate.
- Paybacks include $150/yr of running costs and one $2,000 inverter replacement in year 14, which is why they run longer than paybacks quoted elsewhere.
- State export rules cover investor-owned, state-regulated utilities. Municipal utilities and rural electric cooperatives are exempt in most states and set their own terms.
- Installed cost is the state-level EnergySage market figure, not a city quote; a swing of 50¢/W moves payback by roughly a year and a half either way. Get three quotes before trusting any payback — including ours.
Hawaii is not one solar market
Across the 4 Hawaii cities with their own modeled figures, production spans 39% — Kaneohe at 1,157 kWh per kW to Honolulu at 1,610. Every column except production is identical down this table: same 48.0¢/kWh retail rate, same export regime, same $3.39/W installed cost. The payback differences are caused by weather and nothing else.
| Location | kWh per kW per year | 8 kW output | Annual value | Payback |
|---|---|---|---|---|
| Honolulu (this page) | 1,610 | 11,592 kWh | $3,165 | 8.3 yrs |
| Kahului | 1,301 | 9,367 kWh | $2,557 | 10.2 yrs |
| Hilo | 1,177 | 8,474 kWh | $2,314 | 11.2 yrs |
| Kaneohe | 1,157 | 8,330 kWh | $2,274 | 11.4 yrs |
| Hawaii state average | 1,550 | 11,160 kWh | $3,047 | 8.6 yrs |
Against the state figure, Honolulu runs 3.9% above Hawaii’s 1,550 kWh per kW — a payback 0.4 years longer than the statewide 8.6-year estimate on the same hardware at the same price.
The dry side of a wet island
Honolulu’s solar resource surprises people who know Oahu’s reputation for rain. The Koolau range intercepts the trade winds on the windward side and wrings them out there; the leeward south shore, where the city is, sits in the rain shadow. Waikiki, Kakaako and most of urban Honolulu get a solar resource comparable to coastal Southern California.
Cross the Pali and it collapses. Kaneohe, twelve miles away, manages 1,157 — Honolulu makes 39% more per kilowatt than a rooftop on the other side of the same mountain. There is no state figure, and no island figure, that can represent both.
Your utility, officially
Hawaii’s average residential rate is 48.0¢/kWh, but the bill in Honolulu comes from Hawaiian Electric Co Inc at 42.87¢ — 11% below the state figure. These are the residential figures Honolulu’s utility reported to the U.S. Energy Information Administration on Form EIA-861 for 2024 — computed as revenue ÷ sales from the official file, not estimated:
| Utility | EIA ID | Residential avg price | Residential customers | Net-metering (residential, self-reported) |
|---|---|---|---|---|
| Hawaiian Electric Co Inc | 19547 | 42.87¢/kWh | 276,206 | 64369 customers / 336.338 MW |
How exports are treated matters as much as the headline price: Hawaiian Electric Co Inc is modeled here under the state’s net billing rules, and that treatment is baked into every payback figure on this page.
Hawaiian Electric bills every home in Honolulu, and its price explains Oahu solar better than any incentive ever could: 42.87¢/kWh, averaged across 276,206 residential customers in the 2024 EIA-861 file. That is the highest figure for any utility this site tracks — a quarter above Con Edison in New York, more than triple Salt River Project in Phoenix. The cause is structural, not managerial: Oahu is an island grid that historically burned imported oil for power, so residential rates track fuel shipments the way mainland rates never do. When a kilowatt-hour avoided is worth nearly 43 cents, rooftop solar stops being an environmental gesture and becomes the obvious household hedge, which is exactly what the adoption data shows. Hawaiian Electric reported 64,369 residential net-metering customers and 336.338 MW for 2024 — roughly one in four of the homes it serves, a saturation matched in our data only by San Diego.
Hawaiian Electric is investor-owned and regulated by the Hawaii Public Utilities Commission, and the export regime has been through more generations here than anywhere in the country. The current door for new systems is the Smart Renewable Energy (SRE) Export program, effective October 1, 2024: a time-varying export credit — 13.5¢ daytime, 18.9¢ overnight, 32.9¢ during the evening peak on Oahu — locked for seven years. The predecessor programs (CGS+, Smart Export, Battery Bonus) closed to new customers the same day. Note what the structure is telling you: the grid pays 2.4 times more for an evening kilowatt-hour than a midday one, so a battery that shifts your surplus into the evening window is not an accessory here, it is the program’s entire design intent. The official program pages are Hawaiian Electric’s customer renewable programs hub and its rooftop solar page .
On rate structure, be cautious: Hawaiian Electric’s residential schedules have been in transition, with time-of-use designs advancing, so confirm the schedule your own account is billed under rather than assuming a flat rate. Two anchors hold regardless. The 42.87¢ average is what self-consumption is worth today. And Hawaii’s export terms reset on a seven-year cycle — long enough to plan around, short enough that the vintage you interconnect under genuinely matters.
Source: EIA Form EIA-861, 2024 final release , accessed 2026-09-02. Average price is total residential revenue divided by total residential sales for the year — your own rate depends on your tariff and usage tier.
Export credit is unusually good here, and it is time-of-use
Hawaii moved to Smart Renewable Energy export in October 2024, and unlike most net-billing regimes it is not a haircut across the board. Oahu exports are credited at 13.5¢ during the day, 18.9¢ overnight and 32.9¢ at the evening peak, locked for seven years. The model above uses the 13.5¢ daytime rate, because that is when an unbatteried rooftop array actually exports.
That makes Honolulu one of the few US markets where a battery has a straightforward arithmetic case rather than a resilience case: shifting a kilowatt-hour from a 13.5¢ daytime export to a 32.9¢ evening export is a 19.4¢ gain, every time, on a locked schedule. CGS+, Smart Export and Battery Bonus are legacy programs and closed to new customers.
What Hawaii pays Honolulu for exported power
Hawaii does not credit exports at the retail rate, and that rule reaches Honolulu unchanged. The program is Smart Renewable Energy (SRE) Export , in force since 2024-10-01, crediting surplus power at a published rate of 13.50¢/kWh against a retail rate of 48.0¢.
Oahu TOU export: 13.5c daytime, 18.9c night, 32.9c evening peak, locked for 7 years. Modeled on the daytime rate, because that is when a rooftop array actually exports.
CGS+, Smart Export and Battery Bonus are now legacy programs, closed to new customers since 1 October 2024.
Because a typical home uses only about 40% of its generation as it is produced, most of what a Honolulu array makes is sold at that lower rate. That is why the payback above is 9.0 years and not the 4.8 years the same hardware would return under full-retail net metering. Raising self-consumption is the lever that closes the gap.
Sources and method
- Production: modeled with PVGIS v5.2 PVcalc (European Commission JRC) using the PVGIS-NSRDB radiation database — the same NREL satellite dataset PVWatts draws on for the Americas. Assumptions: 4 kWp, standard c-Si, 14% system loss, roof mounting, 20-degree tilt, due south, horizon shading on. The 1,610 kWh per kW figure for Honolulu is a modeled location point, not an interpolation from the Hawaii average. PVGIS is free to use with JRC attribution requested; the underlying NSRDB is public domain (NREL/DOE).
- Real-roof derate: a separate 10% deduction for azimuth, pitch and shading, applied in the shared model rather than folded into the production data — so you can adjust it if your roof is genuinely unobstructed.
- Electricity rate: U.S. Energy Information Administration, average price by state . This is Hawaii’s residential average; EIA does not publish a Honolulu figure, so the state rate is used and labeled as such.
- Export rules: Smart Renewable Energy (SRE) Export , from our Hawaii state page and the shared export-rules dataset behind it.
- State average rate: EIA Table 5.6.A, July 2026 data (released Sep 2026), used for every state-average comparison on this page.
- Payback model: shared with the solar savings calculator and the state pages — 2.5%/yr utility inflation, 0.5%/yr degradation, $150/yr running costs, one $2,000 inverter replacement in year 14, federal credit $0. The rest of the toolset — battery, sizing, financing — is under all calculators .
- Incentives: DSIRE . City and utility programs change more often than state ones — check yours directly.
Electricity rate, export regime, production figure and installed cost on this page were last verified on 30 August 2026. Export credits reset on annual tariff cycles and incentive budgets run out mid-year, so treat every figure as a snapshot at that date and confirm current terms before acting. Nothing here is tax or financial advice.
Frequently asked questions
How much do solar panels cost in Honolulu in 2026?
About $27,120 for a typical 8 kW system at $3.39 per watt, before any incentive. With the federal credit at $0 in 2026 that is close to your net cost. Note that the price per watt is a Hawaii market average — there is no reliable city-level cost data, so treat it as a starting point and get three quotes.
What is the solar payback in Honolulu?
Roughly 9.0 years on this model, using Honolulu’s own production figure of 1,610 kWh per kW and its own utility tariff (42.87¢/kWh) with each utility’s real export treatment. That includes $150 a year of running costs and one inverter replacement, which many published paybacks leave out.
Is Honolulu better or worse for solar than the rest of Hawaii?
Against the state figure, Honolulu runs 3.9% above Hawaii’s 1,550 kWh per kW — a payback 0.4 years longer than the statewide 8.6-year estimate on the same hardware at the same price.
Is solar worth it in Honolulu in 2026?
Honolulu is one of the strongest residential solar cases in the United States on this model — 1,610 kWh per kW against a 42.87¢/kWh rate, paying back in roughly 9.0 years despite the highest install cost in the country.
How we calculated this
Year-1 saving = production (kW × the city’s modeled kWh per kW) × the blended kWh value (retail rate for self-use, the state export rule for exports). Payback = net cost ÷ year-1 saving, with the federal credit at $0 for 2026 purchases and cost per watt from the state’s installed-price band. Production is modeled from PVGIS/NSRDB irradiance for the city.Sources: U.S. Energy Information Administration (EIA) electricity rates · DSIRE incentive records · public IRS/OBBBA guidance. Figures are modeled estimates, not quotes or tax advice. See our methodology.
Compare with the rest of Hawaii
- Solar panel cost in Hawaii — The statewide picture: Hawaii’s rate, incentives, export rules and the 1,550 kWh per kW average this page corrects.
- Solar panel cost in Kahului — 1,301 kWh per kW and a 10.2-year payback — worse than Honolulu on identical hardware.
- Solar panel cost in Hilo — 1,177 kWh per kW and a 11.2-year payback — worse than Honolulu on identical hardware.
- Solar panel cost in Kaneohe — 1,157 kWh per kW and a 11.4-year payback — worse than Honolulu on identical hardware.
- Solar panel cost in Los Angeles — 1,610 kWh per kW in California — the closest production match to Honolulu in our data.
- Solar panel cost in Reno — 1,596 kWh per kW in Nevada — the closest production match to Honolulu in our data.
- All city solar figures — The 66 US cities with their own modeled production data, and the spreads between them.