What does the cryptic crossword clue "Gas energy helping to avoid type of electricity generation (8)" mean?

The definition is "Gas". The wordplay uses a charade (building blocks). HYDRO (synonym="type of electricity") + GEN (synonym="GEN") = HYDROGEN; definition: "Gas" The answer is HYDROGEN.

Gas energy helping to avoid type of electricity generation (8)

Guardian Cryptic #29251 | 6 Down | 2023-12-12 flower

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