Wärtsilä's energy storage system.
Courtesy of Wärtsilä

Companies have spent trillions investing in clean energy like wind and solar power, but the question remains: What happens when the sun isn’t shining and the wind isn’t blowing? Finnish firm Wärtsilä is fixing the problem by constructing a flurry of facilities that store renewable energy and then dispatch it to the grid when it’s needed. In recent months, it completed work in critical locations like Hawaii (heavily reliant on imported diesel fuel) and on a new, utility-scale storage system in Texas (plagued by power outages in recent years). New facilities are also sprouting up across the globe from Chile to the U.K. “The market is still growing,” says CEO Hakan Agnevall. “And not only in the U.S.”

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Write to Justin Worland at justin.worland@time.com.

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