Project Spotlight

Clearway Energy Group

500 MW / 2 GWh
One of largest co-located energy storage portfolios in the US

Supporting the clean energy transition in California and Hawaii

Wärtsilä teams up with Clearway to optimise some of the largest solar+energy storage facilities in the world

California and Hawaii are leading the energy transition in the United States. As the two states increase their mix of renewable energy generation to further their aggressive carbon reduction goals, the need for energy storage technologies is paramount to the health of their electric grids.

To provide essential grid reliability in these markets, Wärtsilä is providing a 497-megawatt (MW) / 1.9-gigawatt hour (GWhac) portfolio—including hardware and softwareof five energy storage systems to Clearway Energy Group, one of the largest developers and operators of clean energy in the U.S. The projects are in Hawaii and California and are coupled with solar photovoltaic (PV) resources at each site. The projects make up some of the largest co-located energy storage projects in the US.

Main Data

Customer Clearway Energy Group
Site sizes Combined 500 MW/ 2 GWh portfolio
Site locations San Bernardino & Kern Country, California, US
Oahu, Hawaii, US
Applications Renewables+
Scope of services Engineering equipment delivery (EEQ), Service+ GAP
Delivery 2022-2023
Portrait of Håkan Agnevall

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 optimisation 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.


Co-located carbon-free energy

Stability to the Californian and Hawaiian energy markets


Wärtsilä is supplying a total of 422 MW / 1.6 GWh of energy storage to be installed at three of Clearway’s solar facilities in Southern California.


Wärtsilä is supplying 75 MW / 300 MWhac of energy storage, installed and operating at Clearway’s 75 MW PV facilities in Oahu.


Energy storage to ensure reliable delivery of renewable energy

Optimal performance on guaranteed levels

The energy storage projects in California will ensure long-term favourable outcomes for Clearway’s solar PV facilities and provide additional flexibility to the local grid by enabling renewable energy distribution during volatile peak periods.

In Hawaii, the storage projects will help Clearway ensure reliable delivery of sustainable energy and contribute to the state’s carbon reduction targets.

Each facility will include Wärtsilä’s GridSolv Quantum, a fully integrated, modular, and compact energy storage system as well as the GEMS Digital Energy Platform. All five projects will also include Wärtsilä’s 10-year Service+ GAP agreements, guaranteeing capacity and maintenance with performance guarantees for the lifecycle of the system.

Hawaii Challenge

Wärtsilä's Hawaii Solution

Hawaii Benefit

Help Hawaii meet its clean energy targets.

Wärtsilä integrated 75 MW / 300 MWh of energy storage systems with two of Clearway’s existing solar PV facilities in Hawaii.

Provide stability to the Hawaiian energy market while allowing the state to continue to integrate renewable energy assets and progress toward the country’s decarbonisation goal.

Help Clearway ensure reliable delivery of sustainable energy from its solar PV facilities on the island of Oahu, Hawaii.

Wärtsilä's Service+ GAP solution ensures the energy storage systems perform optimally and on guaranteed levels.

Reduce energy costs for Hawaiian residents by providing more affordable energy options and reducing reliance on imported fossil fuels.