Clearway completes 39-MW solar, 156-MWh storage project on O’ahu

Clearway Energy Group has completed construction and reached commercial operations at its Mililani Solar I plant. This is Clearway’s fourth solar plant on O’ahu and the island’s first utility-scale solar and battery storage power plant.

The 39-MW Mililani Solar power plant is paired with a 156-MWh battery system.

“Hawai’i has long led the nation in the transition to reliable carbon-free power. Today’s celebration of O’ahu’s first major solar and energy storage plant is evidence that that ambition is well within reach,” said Craig Cornelius, CEO of Clearway. “We’re proud to help Hawai’i achieve its clean energy goals and we are grateful to Hawaiian Electric, whose partnership has been critical in reaching this important milestone.”

The $140 million project broke ground in April 2021 and installation of the panels and battery storage was completed ahead of schedule. Mililani Solar and Clearway’s second solar and storage plant under construction in Waiawa are together expected to contribute $9 million in taxes to the City and County of Honolulu. More than 240 local union jobs were created during construction of both plants and a permanent workforce will support ongoing operations and maintenance.

Wärtsilä supplied the energy storage components, and Moss led project construction.

“Wärtsilä is proud to be leading the clean energy economy in Hawaii and addressing climate change in partnership with Clearway Energy Group and Hawaiian Electric. Power system optimization technology and flexibility solutions such as energy storage play a key role in balancing the state’s renewable energy power systems and ensuring power reliability for island residents,” said Håkan Agnevall, president and CEO, Wärtsilä.

Construction of Clearway’s second solar and battery storage plant in Waiawa, being built on Kamehameha Schools land, is expected to be complete later this year. Altogether, Clearway’s five solar power plants totaling 185 MW will serve Hawaiian Electric’s grid.

News item from Clearway

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