Possible Clues:

• Such a collection of what's thin, by the sound of it, is great gas
• A set of thin sound one may make light of
• It's great gas the way you can make light of it
• Clean yet unreliable energy that powers industrial torch
• Energy type (without lead) in spots producing gas used as fuel
• EEC neatly ordered cutting gas emission?
• Gas provides volatile, yet clean, energy
• Sounds like a collection of the thin - great gas to make light of it
• It's great gas to make light of it
• By the sound of, just a lot of lean gas