Hydrogen

Explore how hydrogen is produced, stored, transported and used across the energy system — from industrial applications and fuel cells to infrastructure, markets and emerging technologies.

What is an electrolyzer? The machine that turns electricity into hydrogen

Electrolyzer featured image showing renewable electricity splitting water into hydrogen and oxygen inside an industrial electrolysis unit.

An electrolyzer takes electricity, water, and some very deliberate electrochemistry and produces hydrogen and oxygen. That sounds simple enough. The interesting part begins when the machine becomes hundreds of megawatts large, starts following wind and solar production, competes for cheap electricity, needs purified water and compression, and discovers that making hydrogen cheaply is mostly an electricity problem wearing a chemistry badge.