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By "greener" they mean "we want to lower our utilities bill."

Exactly. By greener I mean save money, which I really need to do to safeguard my job in the current turbulent financial market.

That's not what "greener" means. That's just "reducing opex", which is a much simpler question.

Is there any capex budget for reducing opex? If so, any time frame limitation for recognized savings?