Solar Panel Installation Cost in Honolulu, HI

Honolulu is served by Hawaiian Electric (HECO). Hawaii has the highest residential electricity rates in the United States, averaging $0.35 to $0.45 per kWh. This single fact makes Honolulu one of the best cities in the country for solar.

Hawaii has shifted from traditional net metering to Customer Grid-Supply (CGS) and Customer Self-Supply programs. The export credit rate under CGS is lower than retail but still meaningful at $0.10 to $0.15 per kWh. Battery storage is popular here to maximize self consumption at retail-displacing rates.

The federal 30% ITC expired December 2025. Hawaii has its own 35% state solar tax credit (HRS 235-12.5), which is among the most generous in the nation. This significantly softens the federal ITC loss.

Honolulu averages 5.4 to 5.8 peak sun hours per day. A 7 kW system produces about 10,500 to 12,000 kWh per year. Trade winds moderate temperatures, so panels run efficiently without extreme heat derating.

Oahu's microclimate varies: Honolulu proper (south shore) gets more sunshine than the windward side (Kailua, Kaneohe). Shade from monkey pod and banyan trees is common in older neighborhoods.

Honolulu incentives:

Hawaiian Electric: • Customer Grid-Supply (CGS) program: export credits around $0.10 to $0.15 per kWh • Customer Self-Supply (CSS) program: no export allowed, all solar must be self consumed or stored. Lower interconnection barriers • Smart Export: newer program with time varying export rates • HECO rates approximately $0.35 to $0.45 per kWh, highest in the US

Hawaii state: • 35% state solar tax credit (HRS 235-12.5) with a $5,000 cap. This is the strongest state solar tax credit in the country • Property tax exemption: solar in Hawaii is exempt from property tax assessment • Hawaii's 4.712% general excise tax applies to solar purchase price (functionally similar to a sales tax)

Federal: 30% ITC expired December 2025. The 35% state credit partially compensates.

Honolulu installation notes: Permits through the City and County of Honolulu Department of Planning and Permitting. HECO interconnection can take 4 to 12 weeks depending on the program (CGS vs CSS vs Smart Export). Battery storage is nearly standard in Hawaii solar installations. Most installers recommend it.

Roof types: Many Honolulu homes have metal roofs, which are straightforward for solar. Concrete tile roofs require specialized mounting. Some older homes in Manoa and upper Nuuanu have galvanized steel roofing that may need assessment.