Hawaiian Electric customers continued to add rooftop solar at a steady pace in 2025, boosting the total number of systems to more than 120,000 across the five islands the company serves.
The addition of 6,571 solar systems in 2025, most of which are residential, increased the total number of grid-connected solar systems to 120,570, a 6% increase over 2024. Solar generating capacity, which includes residential, commercial and grid-scale systems, rose to 1.6 gigawatts, an 11% increase over 2024.
Photovoltaic (PV) systems and PV capacity by county/island, including residential and commercial/grid-scale shares.
Hawaii has among the highest rates of rooftop solar adoption in the nation. Some 27% of Hawaiian Electric's residential customers and 45% of its customers in single-family homes have rooftop solar. On Oahu, fully half of customers in single family homes have rooftop solar.
Hawaiian Electric experienced a surge in applications for residential rooftop solar and battery storage systems during the second half of 2025 after the federal government moved up the deadline for claiming the Residential Clean Energy Tax Credit to Dec. 31, 2025. Previously, homeowners had until the end of 2032 to claim the full tax credit for qualifying clean energy technologies. Hawaiian Electric received 6,552 applications from July through December 2025 compared to 4,770 applications for the same six months in 2024.
Smart Renewable Energy is the latest phase in Hawaiian Electric's push to bring more customer-sited renewable energy onto the grid in a fair and sustainable way. More information about Hawaiian Electric's Smart Renewable Energy program is available at Smart Renewable Energy Programs.
