We will be able to use less energy per person. You are wrong about not being able to conserve. I have won awards for conserving energy. I know that it can be done. The energy bill that comes due each month has been my proof.
Sure each people can cut down their usage a some, for a time, all I’m saying is that we will never be able to conserve ourselves into energy independence. New buildings are being built, babies are born, and while switching to new bulbs might save some, people are going top end up buying a new plasma, which uses 10x more power. In a growing economy, we will never be able to cut our energy useage as a nation, at least for any sustained period of time.
Can individual businesses cut out inefficiencies? Yes. Can individual homeowners? Again, yes. But so long as our economy continues to grow (which is an major IF, if we continue on down this road to a European style economy), the new houses and factories being built will outweigh any cuts.