The world needs a new source of energy, an unspillable source.

Why do energy companies promote energy conservation and efficiency?

My gas company gave me a free energy audit of my home, and offers generous rebates to install insulation and other energy saving products. I don’t understand why they do this. If I use less gas, they make less money. Why are they doing these things?
By the way, I won’t believe any answers that say “it’s the right thing to do”, or “they want to be green”. I don’t buy that. Profit drives almost all business decisions, and this doesn’t seem profitable to me.