Gas energy helping to avoid type of electricity generation (8)
I believe the answer is:
hydrogen
'gas' is the definition.
(I know that hydrogen is a type of gas)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for hydrogen that I've seen before include "Element with atomic number 1" , "Kind of bomb" , "Lightest and most abundant of all substances" , "Gas, symbol H" , "Gaseous element" .)