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 software—of 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.

The portfolio includes the Daggett 2 and Daggett 3 projects, which taken together represent one of the largest co-located photovoltaic plus storage facilities in California, at 482 MWac of solar PV and 275 MWac / 1.1 GWh of energy storage. The Daggett projects are in San Bernardino, California, adjacent to the site of a retired coal and natural gas plant. The AC-coupled energy storage systems will deliver renewable energy during increasingly volatile peak periods and help the state reach its goal of 100 percent carbon-free electricity by 2045. The order for Daggett 3 was booked to Wärtsilä order intake in Q3 2021, and the order for Daggett 2 was booked in Q4 2021. Construction has commenced on both projects with expected completion dates in 2023.

Two projects, comprising 75 MWac / 300 MWh (megawatt hour) of energy storage, are being installed at Clearway Energy Group’s Mililani I Solar and Waiawa Solar Power facilities on the Island of Oahu in Hawaii. The addition of energy storage will help Clearway Energy Group ensure reliable delivery of sustainable energy and contribute to Hawaii’s goal of reaching 100 percent renewable energy generation by 2045. The orders for Mililani I Solar and Waiawa Solar Power were booked to Wärtsilä order intake in Q1 2021, and construction is expected to finalise in 2022. The projects are Wärtsilä’s first large-scale energy storage systems in Hawaii.

The fifth project in the portfolio is a 147 MWac / 588 MWh energy storage system that will be connected to the operating 192 MWac Rosamond Central solar PV facility in Kern County, California. The energy storage system will increase the effectiveness of the solar facility by performing ancillary services, primarily solar shifting, for the California Independent System Operator. The order was booked to Wärtsilä order intake in July 2022 and construction is expected to be completed in December 2023.

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.

Author: Bryan Groenendaal

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