I don't see that future computers will require more power, for most people things have been moving towards lower power CPU and GPUs. Complete system-on-chips will probably be much more common. Though it's possible that dedicated gamer graphics cards may continue to suck more power..
Nvidia say that Pascal will be 4 times more energy efficient than present GPUs.
This is at least an hour of presentation by Nvidia, and you may find all of it interesting:
https://www.youtube.com/watch?v=wFSxj_Msc70&list=PLZHnYvH1qtOZZJB2RtwGVK7b233j7bw1K
If you watch just one, then this is my pick (from 5:45):
https://www.youtube.com/watch?v=XISqvBVyASo
'We're going to scale the computational power of these processors for years to come'
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