Solar Panel Cost in Hilo, HI 2026: ~11.2-Year Payback
In Hilo, HI, an 8 kW system at $3.39/W produces about 1,177 kWh per kW and pays back in roughly 11.2 years at 48.31¢/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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- Hilo production
- 1,177 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)
- 11.2 years
Why this number
A kilowatt of panels in Hilo produces about 1,177 kWh a year, placing it 3 of 4 among the Hawaii cities modeled here. The state spans Honolulu at 1,610 down to Kaneohe at 1,157, a 39% span, and Hilo sits inside it at a payback of about 11.2 years.
An 8 kW system in Hilo, priced out
| Metric | Estimate for Hilo | Hawaii statewide |
|---|---|---|
| Production, unshaded 20° south | 1,177 kWh per kW/yr | 1,550 kWh per kW/yr |
| 8 kW output after a 10% roof derate | ~8,474 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 | ~$2,314 | ~$3,047 |
| Rough payback (your utility) | 11.2 years | 8.6 years (state-average model) |
| 25-year net position | $41,114 | — |
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 Hilo array would produce, with rates rising at 2.5% a year, comes to roughly $138,954.
Solar aside, the EV vs. gas cost calculator runs Hilo’s 48.0¢/kWh rate against what a gas car costs to fill instead.
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 | 1,610 | 11,592 kWh | $3,165 | 8.3 yrs |
| Kahului | 1,301 | 9,367 kWh | $2,557 | 10.2 yrs |
| Hilo (this page) | 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, Hilo runs 24% below Hawaii’s 1,550 kWh per kW — a payback 2.6 years longer than the statewide 8.6-year estimate on the same hardware at the same price.
What sets Hilo apart
The lowest figure anywhere in this dataset. Hilo is one of the wettest cities in the United States, and it shows — 400 kWh/kW below Honolulu on the same island chain.
Your utility, officially
Hawaii’s average residential rate is 48.0¢/kWh, and Hilo’s Hawaii Electric Light Co Inc bills almost exactly that, at 48.31¢. These are the residential figures Hilo’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) |
|---|---|---|---|---|
| Hawaii Electric Light Co Inc | 8287 | 48.31¢/kWh | 78,386 | 14358 customers / 83.702 MW |
How exports are treated matters as much as the headline price: Hawaii Electric Light Co Inc is modeled here under the state’s net billing rules, and that treatment is baked into every payback figure on this page.
Hilo is the strangest solar market this site covers, because it holds both extremes at once. Hawaii Electric Light Company — the Big Island’s investor-owned utility, HELCO on your bill — charged its 78,386 residential customers an average of 48.31¢/kWh in the 2024 EIA-861 file. That is the highest residential price of any utility we track, above even Hawaiian Electric’s 42.87¢ on Oahu. And Hilo’s solar resource is the lowest in our entire dataset: 1,177 kWh per kW of unshaded south-facing capacity. One of the wettest cities in the United States sits under near-permanent windward cloud, producing 27% less than Honolulu and about 9% less than Kahului from identical hardware.
Here is the arithmetic that resolves the paradox: 1,177 kWh valued at 48.31¢ is roughly $569 per installed kilowatt per year in avoided purchases — almost exactly what a Kahului roof earns, and more than double what most mainland cities manage with far better weather. The retail price is so extreme that it simply overrules the cloud. Hilo residents have done this math: HELCO reported 14,358 residential net-metering customers and 83.702 MW for 2024 — about one home in five, at a 5.8 kW average, one of the highest saturation rates in the country, in the worst solar climate in our data.
The export rules are set at the state level. Hawaii’s current door for new systems is the Smart Renewable Energy (SRE) Export program, effective October 1, 2024, which replaced the legacy programs (CGS+, Smart Export, Battery Bonus — all closed to new customers that same day). SRE pays a time-varying export credit locked for seven years; we model the daytime rate of 13.5¢/kWh, because midday is when an unassisted rooftop array actually exports. Read the gap: self-consumption is worth 48.31¢, daytime export 13.5¢. Every kilowatt-hour you use yourself is worth three and a half times one you sell, which is why batteries are not an upsell in Hawaii — they are the program’s design intent.
On incentives, Hawaii is one of the few states still writing checks: the Renewable Energy Technologies Income Tax Credit (Form N-342) is worth 35% up to $5,000 per system, and note the fine print that the system must be at least 5 kW. The federal §25D credit is $0 for 2026 cash and loan purchases — expired December 31, 2025. Installed costs run high here, at an EnergySage quote average of $3.39/W. One methodological caveat we owe you: Hilo’s yield figure was modeled from four of five cluster points, the fifth falling outside the dataset’s coastal coverage, so treat 1,177 as a solid estimate rather than gospel.
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.
Hilo against the rest of Hawaii
Same rate, same export rule, same installed price per watt — only the sunshine changes:
| City | kWh per kW | Payback |
|---|---|---|
| Honolulu | 1,610 | 8.3 years |
| Kahului | 1,301 | 10.2 years |
| Hilo | 1,177 | 11.2 years |
| Kaneohe | 1,157 | 11.4 years |
A 39% production span across one state is the reason a single statewide number is only ever a starting point.
What Hawaii pays Hilo for exported power
Hawaii does not credit exports at the retail rate, and that rule reaches Hilo 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 Hilo array makes is sold at that lower rate. That is why the payback above is 11.2 years and not the 6.5 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 1,177 kWh per kW figure for Hilo 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 Hilo 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 Hilo 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 Hilo?
Roughly 11.2 years on this model, using Hilo’s own production figure of 1,177 kWh per kW and its own utility tariff (48.31¢/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 Hilo better or worse for solar than the rest of Hawaii?
Against the state figure, Hilo runs 24% below Hawaii’s 1,550 kWh per kW — a payback 2.6 years longer than the statewide 8.6-year estimate on the same hardware at the same price.
Is solar worth it in Hilo in 2026?
At 48.0¢/kWh and 1,177 kWh per kW, an 8 kW system in Hilo pays back in about 11.2 years on this model. Treat that as a starting point for reading real quotes rather than as a quote: your roof’s orientation, its shading and the price you are actually offered will move it more than your city does.
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 Honolulu — 1,610 kWh per kW and a 8.3-year payback — better than Hilo on identical hardware.
- Solar panel cost in Kahului — 1,301 kWh per kW and a 10.2-year payback — better than Hilo on identical hardware.
- Solar panel cost in Kaneohe — 1,157 kWh per kW and a 11.4-year payback — worse than Hilo on identical hardware.
- Solar panel cost in Albany — 1,178 kWh per kW in New York — the closest production match to Hilo in our data.
- Solar panel cost in Pittsburgh — 1,186 kWh per kW in Pennsylvania — the closest production match to Hilo in our data.
- All city solar figures — The 66 US cities with their own modeled production data, and the spreads between them.