Clean Energy Facts

About Our Fuel Mix

Generation of renewable energy continued to increase in 2017

In 2017, nearly 27 percent of the energy used by customers of the Hawaiian Electric Companies came from renewable resources, up from 26 percent the year before. These results, presented in our Renewable Portfolio Standard report to the Public Utilities Commission, include power generated by customer-sited, grid-connected technologies, such as private photovoltaic (PV) systems.

Based on the commission’s acceptance of the Power Improvement Plan, the companies in 2018 launched an expedited process to acquire more renewable generation, some with energy storage, by 2022:

  • 220 megawatts for Oahu
  • 60 MW for the island of Maui
  • 50 MW for Hawaii Island

The following information focuses on the mix of fuels used to generate the electricity produced by each of our three utilities and the electricity purchased from independent power producers.


On Oahu

In 2017, nearly 11 percent of the electricity generated by Hawaiian Electric, contracted independent power producers, and small feed-in tariff facilities was fueled by renewable resources, including solid waste, wind, solar, and biofuel energy.

As of April 2018, progress continued on several renewable energy projects on Oahu:

  • Two new feed-in tariff PV projects, totaling 5.5 megawatts (MW), went into service in 2017.
  • The 27.6-MW Waianae Solar project went into service mid-January 2017.
  • The 8-MW biofuel-fired Honolulu International Airport Emergency Power Facility became available.
  • The 50-MW Schofield Generation Station, powered by a biofuel blend, went into service in May 2018.
  • The 24-MW Na Pua Makani wind farm in Kahuku remains in development.
  • Construction is underway by NRG Energy Inc. on three facilities, Kawailoa Solar, Lanikuhana PV, and Waipio PV, which range in size between 14.7 MW and 49 MW and total 110 MW.
  • Ground was broken in April for West Loch PV, a 20-MW facility we in conjunction with the Department of the Navy, at Joint Base Pearl Harbor-Hickam.
Oahu Fuel Mix

On Hawaii Island

In 2017, over 40 percent of the electricity generated by Hawaii Electric Light, contracted independent power producers, and small feed-in tariff facilities was fueled by renewable resources, including geothermal, wind, hydro, and solar energy.

In addition to our hydroelectric plants, Puueo 1, Puueo 2, Waiau 1, and Waiau 2, Hawaii Island residents benefit from renewable energy produced by independent power producers:

  • Puna Geothermal Venture facility
  • Two wind farms: Hawi Wind Farm and Pakini Nui
  • Wailuku River Hydroelectric and several other small hydro plants
  • Small feed-in tariff projects are under development.
  • Construction continues on 30-megawatt, firm, renewable power plant at Pepeekeo to be fueled by locally grown eucalyptus trees being built by Hū Honua Bioenergy.
Hawaii Island Fuel Mix

In Maui County

In 2017, nearly 25 percent of the electricity generated by Maui Electric, contracted independent power producers, and small feed-in tariff facilities was fueled by renewable resources, including wind, solar, biomass, biofuel, and hydro energy.

As of April 2018, progress continued on several PV projects in Maui County:

  • The 2.87-megawatt (MW) Kuia Solar facility is scheduled for completion in 2018.
  • The 2.87-MW South Maui Renewable Resources PV facility is scheduled for completion in 2018.
  • Molokai New Energy Partners’ 2.7 MW solar project with a 3-MW/15-MWH energy storage system is awaiting regulatory approval.
  • Small feed-in tariff PV projects are under development.
Maui Fuel Mix

The following table shows the mix of fuels used to generate electricity for delivery to customers in each of our service areas in 2017.

Fuel Mix in Our Service Areas - 2017 Calendar Year*

Fuel Sources Hawaiian Electric
(Island of Oahu) 
Hawaii Electric Light
(Island of Hawaii) 
Maui Electric
(Islands of Maui, Molokai, and Lanai) 
Oil 68.94% 58.52% 79.02%
Coal 20.02% 0 0
Biofuel 0.80% 0 0.08%
Biomass 0 0 0.37%
Geothermal 0 28.71% 0
Hydro 0 2.64% 0.08%
Solar 0.77% 0.36% 0.06%
Solid Waste 5.56% 0 0
Wind 2.79% 9.76% 23.50%
TOTAL: 100% 100% 100%
Total from Renewable Resources11.04%41.48%20.98%

*Percentages are based on the amount of electricity generated by the Hawaiian Electric Companies and purchased from independent power producers in 2017, excluding energy produced by customer-sited PV systems.