Hydrogen Energy
Energy storage and transport medium where hydrogen gas is produced via electrolysis, stored, and combusted or used in fuel cells.
Formula
2H₂O → 2H₂ + O₂ (electrolysis) / 2H₂ + O₂ → 2H₂O + energy (fuel cell)
Real World
Siemens Energy operates green hydrogen electrolysers in Wunsiedel, Germany, powered entirely by wind electricity, producing zero-emission hydrogen for industrial use and demonstrating the green hydrogen supply chain at scale.
Exam Focus
Always specify 'green', 'blue', or 'grey' hydrogen — examiners penalise vague references to 'hydrogen' without distinguishing production method and emissions.
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