Is everybody missing the point here.
All Microsoft operating systems have always consumed masses of power when they are doing nothing. How many people over the years have watched the drive access light flashing away, wearing out the hard drive and keeping the electric meter spinning when the computer should be completely at rest. Android uses a tiny fraction of the energy most windows machines do. Multiply this profligate squandering of power by the billions of PCs switched on at any moment and any power consumed by the data centres becomes completely irrelevant on a global scale, the only effect of this initiative will be on Microsnot's electricity bill.