Distro Uses Less Energy?
 

So which Linux uses the less energy? I'm using a laptop, so I want to conserve energy for it to last longer.

moving to hardware

I would assume the distros that are more lightweight and don't have as much eye candy and background processes. I would say the Slackware family (if you don't go crazy with the packages) or Vector Linux.

Energy is always conserved.

Maybe in place of slackware, something like Gentoo, where you optimise everything to minimize cpu cycles? On most newer distros, you can take advantage of cpufreq scaling and suspend-to-ram and others.