Green energy company that was of a mind to store insufficient energy (13)

I believe the answer is:

environmental

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'green' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for environmental that I've seen before include "Pertaining to the surrounding world" , "Green" , "To do with one's surroundings" .)

I've seen this clue in The Times.

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