Everything is hydro-electric around here thank goodness. There are still a few coal burning stations though, but I think they only see heavy use in winter when demand is higher.
I too have been away from Zbrush for some time now. I tend to drift from interest to interest with photography generally being my primary one. Z2 definitely has a lot of great new features that will certainly bring me back into the fold. Was even thinking of selling my Wacom Intuos2 9x12 at one point but now I think I’ll keep it a bit longer. 
So, the thing that I think is the coolest about Z2? Well, from looking at the thread over at CGTalk, it looks like Z2 is going to bring in a lot of new talent. Probably even some of the Zbrush naysayers from days gone past. The fact that WETA used it is turning a lot of heads in the industry me thinks.
Only one more week to go! Woo hoo! 