Re: WTF?
How much power can an update even use? If knowing when your utility power is coming from renewable sources is actually possible I'd be all for implementing it, but with things where that really matters like charging electric cars. Probably less power would be used to update my whole city's worth of Windows PCs than to fully charge one Tesla.
Now for those who have solar panels and don't have net metering, using renewable power when you have it can save you money. But unless you are at work, you probably don't want your PC updating when the sun is shining.