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Power to gas describes the conversion of surplus electricity into

  • A.electricity resold to a neighbouring network
  • B.hydrogen or methane injected into the gas network
  • C.compressed air stored in a cavern
  • D.hot water stored in a district heating main

Answer: B

Correct answer: hydrogen or methane injected into the gas network

Power to gas uses surplus electricity to electrolyse water, and either injects the hydrogen directly into the gas network within the permitted limit, or combines it with carbon dioxide to make synthetic methane which the network can take without restriction. The attraction is the gas network’s own enormous storage capacity, far beyond anything the electricity system possesses, already built and paid for.

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