What solar costs in Hawaii
Berkeley Lab does not have enough reported installations in Hawaii to publish a reliable local price, so the figures below use the national median. Treat them as a starting point, not a quote.
The numbers
High electricity prices make solar pay faster, so a red figure in the third box is good news for a solar buyer and bad news every other month of the year.
Holding a quote above $30,000? Installers in Hawaii price the same system very differently. Two more bids is the cheapest way to find out where yours sits.
Plain outbound links. We take no phone numbers and sell no leads: you give your details to the company that will actually call you, not to us.
What the roof makes month by month in Honolulu
A 1.3 to 1 swing, which is unusually flat. Output here is steadier month to month than almost anywhere else in the country, so monthly bills stay more predictable.
Figures are for an 8 kW array at 20 degrees facing south, modelled from NSRDB radiation data at Honolulu.
What different sizes cost in Hawaii
| Size | Panels | Price | Output | Year one saving | Payback |
|---|---|---|---|---|---|
| 4 kW | 10 | $15,000 | 6,424 kWh | $3,084 | 4.7 years |
| 5 kW | 13 | $18,750 | 8,030 kWh | $3,854 | 4.7 years |
| 6 kW | 15 | $22,500 | 9,636 kWh | $4,625 | 4.7 years |
| 7 kW | 18 | $26,250 | 11,242 kWh | $5,396 | 4.7 years |
| 8 kWtypical | 20 | $30,000 | 12,848 kWh | $6,167 | 4.7 years |
| 10 kW | 25 | $37,500 | 16,060 kWh | $7,709 | 4.7 years |
| 12 kW | 30 | $45,000 | 19,272 kWh | $9,251 | 4.7 years |
| 15 kW | 38 | $56,250 | 24,090 kWh | $11,563 | 4.7 years |
| 20 kW | 50 | $75,000 | 32,120 kWh | $15,418 | 4.7 years |
Payback is the same at every size because this table holds the price per watt flat at the national median of $3.75: price and output both grow in step with the system, so their ratio does not change. Real quotes are not quite linear. Permitting, design and connection cost roughly the same on any roof, so a small system usually costs more per watt and a large one less, and pays back correspondingly later or sooner than shown.
Hawaii has too few reported installations for a local median, so the price is the national median of what households paid on host-owned systems installed in 2024-2025, compiled by Berkeley Lab. Local quotes can sit well above or below it.
10 programmes in Hawaii
The 30% federal credit ended for installations completed after 31 December 2025. These state, utility and local programmes are unaffected by that, and are now the only thing that reduces the price.
| Programme | Type | Run by | Reach | Updated |
|---|---|---|---|---|
| Interconnection Standards | Interconnection | State | statewide | June 10, 2024 |
| Smart Renewable Energy Tariffs | Net Metering | State | statewide | February 20, 2026 |
| Solar and Wind Energy Credit (Corporate) | Corporate Tax Credit | State | statewide | September 4, 2026 |
| Solar and Wind Energy Credit (Personal) | Personal Tax Credit | State | statewide | September 4, 2026 |
| City and County of Honolulu - Real Property Tax Exemption for Renewable Energy Property | Property Tax Incentive | Local | partial | October 25, 2024 |
| City and County of Honolulu - Solar Loan Program | Loan Program | Local | partial | May 24, 2024 |
| Hawaii Solar Installation Rights | Solar/Wind Access Policy | State | partial | February 18, 2026 |
| KIUC - Solar Water Heating Loan Program | Loan Program | Utility | partial | May 10, 2024 |
| KIUC - Solar Water Heating Rebate Program | Rebate Program | Utility | partial | May 10, 2024 |
| Solar Water Heater Rebate | Rebate Program | State | partial | May 30, 2025 |
Programme index from DSIRE, N.C. Clean Energy Technology Center, NC State University, licensed CC BY-SA 4.0. “Partial” means it reaches only some utilities or counties. A listed programme can still be closed or out of budget, so check its own page before counting on it.
How Hawaii ranks
Solar in Hawaii, answered
How much do solar panels cost in Hawaii?
An 8 kW system in Hawaii, roughly 20 panels, costs about $30,000 before incentives. That is based on $3.75 per watt, the national median from Lawrence Berkeley National Laboratory for 2024-2025, because too few Hawaii installations are reported to publish a local figure. There is no longer a federal tax credit to subtract from that figure.
Is there still a 30% solar tax credit in Hawaii?
No. The federal Residential Clean Energy Credit under Internal Revenue Code section 25D was terminated by the One Big Beautiful Bill Act for expenditures made after 31 December 2025, and it did not step down first. A Hawaii homeowner buying a system with cash or a loan today receives no federal tax credit. Under a lease or power purchase agreement the credit survives as section 48E but belongs to the company that owns the equipment, not to the household. Hawaii still has 10 state, utility or local programmes covering rooftop solar.
How long do solar panels take to pay for themselves in Hawaii?
About 4.7 years in Hawaii. An 8 kW system costs roughly $30,000 and saves about $6,167 in its first year at the state's average residential rate of 48.00 cents per kilowatt-hour (EIA, July 2026). That calculation includes no federal tax credit, because the residential credit ended after 31 December 2025.
How much electricity does a solar panel produce in Hawaii?
Each kilowatt of panels in Hawaii produces about 1,606 kilowatt-hours a year, modelled at Honolulu facing south at a 20 degree tilt using NSRDB radiation data. An 8 kW system therefore makes roughly 12,848 kilowatt-hours a year. The national average is about 1,332 kilowatt-hours per kilowatt installed.
Is solar worth it in Hawaii?
It depends less on sunshine than on your electricity price. In Hawaii power costs 48.00 cents per kilowatt-hour (EIA, July 2026), which makes an 8 kW system pay for itself in about 4.7 years and clear roughly $167,217 over 25 years. Solar from your own roof works out at 9.9 cents per kilowatt-hour over its life, against 48.00 cents from the utility.
How many solar panels do I need in Hawaii?
A typical Hawaii installation is about 20 panels, which is 8 kW at the 400 watt module that is now standard and needs roughly 440 square feet of roof. To size it to your own use, divide your annual kilowatt-hours by 1,606, which is what each kilowatt of panels produces in Hawaii each year.
Do solar panels work in winter in Hawaii?
Yes, but output falls sharply. In Honolulu a kilowatt of panels makes about 154 kilowatt-hours in Aug and about 116 in Feb, a swing of 1.3 to 1 across the year. A system sized to cover your annual consumption will therefore run a surplus in summer and leave you buying power in winter, so how your utility settles that difference matters as much as the size of the array.
Three competing quotes beat any amount of comparing panel brands
Sales cost and margin are over a third of an installed price in Hawaii, and they are the part that competition removes. A single quote from whoever reached you first is how people end up in the top quarter of what their neighbours paid.
Plain outbound links. We take no phone numbers and sell no leads: you give your details to the company that will actually call you, not to us.
Prices and rules change. We will tell you when they do
Berkeley Lab publishes installed prices once a year, the EIA updates electricity rates every month, and Congress changed the tax treatment of all of this in 2025. One email when something on this site actually changes, and nothing else.
Email address only. No phone field, no passing you to installers, unsubscribe in one click.