Revolution is set 15 years after a global blackout, where all the power in the world just shut off without warning. This includes batteries, phones... etc. Nothing electronic works, and it focuses on:
A) Struggle to survive; and
B) Figuring out why this happened and how to fix it.
It's a great show, little tacky near the end of season 1, but otherwise great! Season 2 has aired two episodes and they're looking amazing <3
You really should give it a try :p