Solar Panels Cost $2.9k-$14k in Napili-Honokowai CDP, HI | June, 2025

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.