There are plans going on to do that, but I believe that the consumption of electricity is one of the major reasons (or a main feature) which is why Bitcoin is the supreme of all. Mining process is the cause of investors' speculations, so thinking that the numbers might shrink currently is still hopeless because electricity is generating something that possesses much bigger value than what they earn through their 9-to-5 jobs. It takes few months to ROI and if these miners hold, they can make much more of their revenues in Bitcoins. I urge these miners to start investing some percentage of their mining income in purchasing solar based equipment to help reduce this rough consumption of electricity.