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A Green Hydrogen Economy Depends on This Little-Known Machine

The electrolyzer, obscure for decades, sees its sales soar. Here’s how the technology works.

A Plug Power Inc. electrolyzer stack at the company’s Concord, Massachusetts, facility. Electrolyzers, which use electricity to split water into hydrogen and oxygen, are a building block of a green hydrogen economy.

A Plug Power Inc. electrolyzer stack at the company’s Concord, Massachusetts, facility. Electrolyzers, which use electricity to split water into hydrogen and oxygen, are a building block of a green hydrogen economy.

Photographer: Adam Glanzman/Bloomberg

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Solar power depends on the solar cell. Wind power, the wind turbine.