Solar Panels Cost $2.7k-$13k in Honolulu County, HI | February, 2025
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How much do solar panels cost in Honolulu County, HI in 2025?
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For going solar in Honolulu County, HI, the price per watt in February, 2025 is around $3.88/W.
As a result of the rate, solar panels will cost you about $3,880 per 1K (or 1000 watts) of production capacounty. In Honolulu County, the cost of a 5 kW system is typically $13,580, after you subtract 30% federal tax credit. Remember, a more extensive system may be needed to fully meet your energy demands effectively.
To the left,choose your area to see the average roof size and the average maximum capacity of residential solar for homes in your county. You can review the costs, payback period, and 20-year average savings for a 5 kW system installed in your county below.
Average out-of-pocket cost for a 5 kW system The upfront amount spent to buy and install solar.
Honolulu County: $13,580US Average: $12,523
Average Payback Period The number of years until you break even on the solar investment.
Honolulu County: 6 yearsUS Average: 7 years
Average Net 20-year savings The total amount of money saved over 20 years minus the out-of-pocket cost.
Honolulu County: $29,486US Average: $16,301
Solar Potential in Honolulu County
Estimated system size and solar electricity production per median viable roof in Honolulu County.
Roof size 1,162sq. ft.
Capacity 16.25kW DC
Electricity 24.1kkWh AC per yr.
Electricity Costs in Honolulu County, HI & What that Means for Your Solar Panel Pricing
Honolulu County's average monthly kWh usage is 463, with the typical electric bill around 203.69. This statistic also reflects data from apartments and smaller housing units, which usually use less energy needs.
For February 2025, the mean electricity rate in Honolulu County, HI amounts to 44.01¢ per kWh.
At this time, a 4 kW solar panel system costs around $15,520 before incentives, but after the 30% federal tax credit, the total drops to $10,864.
Go Solar for less than your cell phone bill.
Average solar panel costs by system size in Honolulu County
To your left, we've provided a full pricing details for the various solar panel system sizes installed in Honolulu County. While a bigger solar installation does come with a larger expense, it also brings higher electricity savings and higher income tax credits.
The solar panel cost calculator, situated to the right and below, provides a cost and benefit breakdown using an average $203.69 electric bill for Honolulu County. Replace the $203.69 with your typical electricity bill to get customized results.
System Size
Roof Size Min. space required
Electricity Value Annual Production
Est. Price
System Size 1kW
Roof Size Min. space required
72 ft²
Electricity Value Annual Production $676 a year
Est. Price
$2,716
Savings from a 1kWthis system
Est. yearly production 1,535 kWh
Est. monthly savings $56
Full payback in 1 years
Environmental Impacts
Reduces CO2 emissions by 1.22 tons a year
Equivalent to planting 56 trees a year
Equivalent to driving 3,018 mi less a year
System Size 2kW
Roof Size Min. space required
143 ft²
Electricity Value Annual Production $1,351 a year
Est. Price
$5,432
Savings from a 2kWthis system
Est. yearly production 3,071 kWh
Est. monthly savings $113
Full payback in 2 years
Environmental Impacts
Reduces CO2 emissions by 2.44 tons a year
Equivalent to planting 112 trees a year
Equivalent to driving 6,036 mi less a year
System Size 3kW
Roof Size Min. space required
215 ft²
Electricity Value Annual Production $2,027 a year
Est. Price
$8,148
Savings from a 3kWthis system
Est. yearly production 4,606 kWh
Est. monthly savings $169
Full payback in 3 years
Environmental Impacts
Reduces CO2 emissions by 3.66 tons a year
Equivalent to planting 168 trees a year
Equivalent to driving 9,054 mi less a year
System Size 4kW
Roof Size Min. space required
286 ft²
Electricity Value Annual Production $2,702 a year
Est. Price
$10,864
Savings from a 4kWthis system
Est. yearly production 6,141 kWh
Est. monthly savings $204
Full payback in 4 years
Environmental Impacts
Reduces CO2 emissions by 4.42 tons a year
Equivalent to planting 203 trees a year
Equivalent to driving 10,936 mi less a year
System Size 5kW
Roof Size Min. space required
358 ft²
Electricity Value Annual Production $3,378 a year
Est. Price
$13,580
Savings from a 5kWthis system
Est. yearly production 7,677 kWh
Est. monthly savings $204
Full payback in 6 years
Environmental Impacts
Reduces CO2 emissions by 4.42 tons a year
Equivalent to planting 203 trees a year
Equivalent to driving 10,936 mi less a year
Honolulu County Solar Panel Installation Incentives & Rebates | 2025
Eligible rural small businesses and farms might have their solar or wind turbine installation costs covered by the REAP Grant, ranging from 80% to 100%. Wondering if you fit this category? Check your eligibility with our REAP Grant eligibility tool.
The federal government offers a 30% tax credit for residential solar systems, which makes solar appealing and sensible for a wide range of homeowners. There are also a range of state and local programs aimed at enhancing solar energy use.
Several utilities and government bodies in Hawaii currently offer 15 solar rebates and incentives.
Solar incentives in HIIncentive Description Value
Solar and Wind Energy Credit (Personal)
Value:Up to $2,250
Beginning in the 1976 tax year, Hawaii businesses have been entitled to income tax credits on new renewable energy devices. The exact rates and amounts of exemptions vary depending on property classification and the specific type of energy system being installed. In each classification, "hard maximums" apply based on the retail price of the system. Amendments to the tax code have since allowed for credit amounts to be paid out as refunds or used toward income liability for the appropriate tax year. Additional information is available on the Hawaii Department of Taxation website.
Solar Water Heater Rebate
Value:Up to $500
Residential customers of the Hawaiian Electric Company, Maui Electric Company, or Hawaii Electric Light Company may be entitled to a one-time rebate to install or replace a solar water heater. Two rebate options, flat rates of $500 or $750, are available depending on the cost of the system. Either rebate will be paid to the solar contractor installing the water heater, meaning it will appear to the customer as a bill credit. Qualifying systems should satisfy all state standards for solar water heating and pass a final inspection from the utility. The program is available on the islands of Oahu, Maui, Hawaii, Molokai, and Lanai. Additional information is available from the HEC website.
Solar and Wind Energy Credit (Corporate)
Value:Up to $2,250
Beginning in the 1976 tax year, Hawaii residents have been entitled to income tax credits on new renewable energy devices. The exact rates and amounts of exemptions vary depending on property classification and the specific type of energy system being installed. In each classification, "hard maximums" apply based on the retail price of the system. Amendments to the tax code have since allowed for credit amounts to be paid out as refunds or used toward income liability for the appropriate tax year. Additional information is available on the Hawaii Department of Taxation website.
Distributed Generation Tariffs
Value:Varies
Interconnected renewable energy and distributed generation customers throughout Hawaii may be compensated for using their system through either grid-supply or Smart Export tariffs (net metering was abolished in 2015.) Under grid-supply tariffs, customer-generators will be credited on their monthly bills for energy sent back to the grid. Unlike net metering, the utility has direct control over how much energy is returned; this is to protect the grid and standardize capacity as per requirements. Different islands have different rate schedules, and rates will vary from time to time. Smart Export tariffs apply to renewable energy systems containing a separate storage module. Excess generation from the system will be used to charge the battery during the daytime, and this energy will be returned to the grid at night. Like grid-supply programs, different islands have different rate schedules for this excess generation. "Community-based tariffs" may apply for microgrid subscribers. These programs function similarly to individual systems, but compensation will be distributed to all subscribers in the proper proportions.
GreenSun Hawaii
Value:Varies
GreenSun Hawaii is an established loss reserve funded by the 2009 federal stimulus package. A variety of lenders throughout the state may tap into the fund to secure loans for homeowners seeking to install new renewable energy devices or make energy efficiency improvements. By having their loans secured, lenders are incentivized to offer lower rates and more optimal terms. Eligible projects include solar PV/water heating/HVAC systems, windows, insulation/weatherization, and ENERGY STAR certified appliances. Interested homeowners should visit the program website to find their local GreenSun lender.
City and County of Honolulu - Solar Loan Program
Value:Varies
Low to moderate-income homeowners in Honolulu or greater Oahu may be eligible for specialized financing on new solar PV/water heating systems, including any necessary roofing work for a successful installation. Condominium owners may also be eligible contingent on approval from their association. Loans come at zero interest, but they may be secured by a mortgage lien if the principal exceeds $10,000. Application forms are available from the City/County of Honolulu website.
Renewables and Efficiency in State Facilities & Operations
Value:Varies
In 2006, Hawaii governor Linda Lingle established new renewable energy standards for state agencies to follow by signing HB 2175. The new law contained: • a minimum LEED Silver certification requirement for all new state buildings, • a solar water heating requirement for all new state buildings, • a requirement for agencies to implement common-sense water and energy saving operational measures, • an order for agencies to purchase only environmentally-friendly products, • and a directive for agencies to track emissions from vehicles. Compliance with the law is measured through annual reports addressed to the legislature.
KIUC - Solar Water Heating Rebate Program
Value:Varies
Energy Wise is a program for commercial customer-members of the Kauai Island Utility Cooperative. Through the program, property owners may receive free advisory services for their energy efficiency and renewable energy needs. A new initiative under Energy Wise awards new solar water heating installations with a $1000 rebate. Eligible systems may be brand new or replace an existing solar water heater over 15 years of age. Additional information is available from the KIUC website.
Feed-in-Tariff
Value:Varies
NOTE: This program is no longer accepting participants. Solar PV, wind, and hydro customers of HECO, MECO, and HELCO may be eligible for the state's feed-in tariff program. Under the program, utilities may sign 20-year contracts to obtain the excess generation from the system in exchange for a fixed rate. Rates vary depending on the method of generation, the rated capacity of the system, and the island on which the system is located. Additional information is available from the Hawaii Department of Energy website.
Solar Contractor Licensing
Value:Varies
The Hawaii Department of Commerce and Consumer Affairs is responsible for issuing contracting licenses in the state. A variety of specialized solar work licenses are available depending on an applicant's training and vocational experience. Solar contracting licenses include C-60 (solar power), C-61 (solar energy), C-61a (solar hot water), and C-61b (solar HVAC). Each license has a separate exam, but all require four years of experience. To install and professionally repair the full breadth of solar PV systems, contractors should pursue a C-13 electrical license, which includes all the privileges of a C-60 solar power license. Plumbing contractors with license C-37 may work with solar water heaters. General contractors have the privileges afforded by a C-61 license. Depending on the license a solar contractor holds, they may need to subcontract certain plumbing or electrical jobs if they do not have the required license. State law requires licensed electricians/plumbers to sign off on any new PV or solar water heater.
City and County of Honolulu - Real Property Tax Exemption for Alternative Energy Improvements
Value:Varies
Any private renewable energy system in Honolulu carries a 25-year local tax exemption by ordinance of the city council. Solar, wind, biomass, and hydroelectric systems qualify for an exemption, as do systems improving energy efficiency at fossil fuel plants. Geothermal and nuclear systems are not exempt. Additional information is available from the Real Property Assessment Division website.
KIUC - Solar Water Heating Loan Program
Value:Varies
Residential members of the Kauai Island Utility Cooperative may be eligible for specialized financing on solar water heaters. Funding may be used to install a new system or replace an existing one over 15 years of age. Loans are serviced by the Kauai Community Federal Credit Union. There is no interest or down payment (both are covered by the utility.) The maximum repayment period is 60 months. The application process involves standard credit checks and a pre-installation audit by KIUC to determine compliance with state standards. Additional information is available from the KIUC website.
Renewable Portfolio Standard
Value:Varies
Beginning in 2009, the Hawaii state government has established a legally binding renewable portfolio standard (RPS) for itself. Previously, RPS laws included provisions for both new renewable energy projects and energy efficiency improvements/offsets; however, only projects falling under the former category meet RPS requirements as of 2015. By 2030, at least 40% of all energy generated in Hawaii must be from renewable sources. 100% of Hawaii's energy should be renewable by 2045. Compliance is measured through a Renewable Energy Credit system and reports sent to the legislature every five years. Additional information is available from the Hawaii Department of Energy website.
Hawaii Energy
Value:Varies
The Hawaii Energy benefits fund supports new renewable energy and energy efficiency incentive programs throughout the state, including public investments toward RPS standards. The fund is supported by a surcharge on all customer utility bills, and its annual budget is determined by each utility's demand. Currently, funds support public bonds for new renewable farms and incentive programs overseen by utilities on five islands. Additional information is available on the fund's website.
Farm and Aquaculture Alternative Energy Loan
Value:Varies
Hawaiian farmers, including fish farmers, may be eligible for special financing from the state government to fund energy efficiency/renewable energy improvement projects. Loans have a maximum principal of 85% of the applicant's project costs up to $1.5 million. Interest rates vary between agriculture and aquacultural property, but they will range from 3 - 5% on unpaid principal only. Repayment periods may extend up to forty years. Loans are serviced by the state Department of Agriculture. The application process includes standard credit checks. Additional information is available from the DOA website.
Are solar panels worth it in Honolulu County, HI?
For those planning to remain in their homes after the solar system's payback period, installing solar panels is a clear choice in Honolulu County. In Honolulu County, HI, the installation of a 5 kW solar system can save you an average of $35,305.6 over 20 years, with an average break even point of 6 years.
The cost of not having solar panels in Honolulu County, HI
Beyond missing out on the savings, the absence of solar panels or another backup energy source leads to full dependence on your electric utility for your power needs. Recent news coverage has revealed that total dependence on your utility company isn't always the most favorable scenario.
The average number of outages per customer per year in Hawaii is 1.44. On average, the length of an outage is 122.37 minutes. Major events like landslides, overloaded power grids, or wildlife damage can cause these durations to rise considerably.
View the info below to see the number of current electricity customers without power in Honolulu County.
A solar panel system could reduce the inconvenience of future outages, even if it lacks a backup battery.
Power Outages
Currently, 0 customers are being tracked in Honolulu County.
What impacts the cost of solar panels in Honolulu County, HI?
Your Energy Needs - Even if the initial expense is higher, the price per watt drops with larger solar panel systems. Many consumers realize it's a good idea to set up a solar system that can generate enough power to offset their electric bill, because it helps them save more money.
Make & Model - Solar panels come in a range of makes and models. Because the installer might have specific brand preferences, it's essential to select a recommended installer. The selection of superior models can greatly enhance the long-term experience for buyers.
Solar Panel Type - For numerous good reasons, monocrystalline panels are now the standard in the industry. Even with a higher cost, this technology generate more energy. The majority of installers choose panels made using this material.
Your Property - Each property and home is one of a kind. Sloped land, trees, or other barriers can increase the difficulty of installing solar panels. These days, solar installers frequently utilize satellite images to evaluate your home and incorporate these considerations into the first cost estimate.
Labor Rates - The wages employees are paid from their employers are different, and these expenses are transferred to the consumers. It is frequent for companies that provide higher wages to receive better reviews for their work and customer service.
Permitting & Interconnection - Installation costs will be influenced by varying local permitting and utility interconnection fees, depending on the region. Reliable local installers will incorporate these figures into your first estimates to eliminate any surprises.
See what solar panels cost in other Honolulu County cities
As of February, 2025, the average per-watt cost for solar panels in Honolulu County, HI is $3.88/W. A 5 kW solar panel system will cost you around $13,580 in Honolulu County, HI after the federal tax credit is applied.
Right now, Hawaii has 15 rebates and incentives available through a variety of utility companies and government entities. Additionally, the vast majority qualify for the 30% federal tax credit.
Although paying in cash provides the most savings, several financing options for solar panels now exist that are cost-effective. Initial quotes from installers will frequently detail information about available financing options.
Yes, the average 5 kW solar panel payback time in Honolulu County, HI is 6 years, with expected savings of $35,305.6 on electricity over 20 years.