Revolution, in which modern civilization loses the ability to use electricity, is set 15 years after the world can suddenly no longer use electricity (due to a terrorist group's invention). As civilization as we knew it has crumbled away (cities reclaimed by forests) after "The Blackout", mankind has adapted through reverting back to a world before we knew electricity.
The surprise is ... that some people somehow can still make electricity work for them - and work on antiquated computers, sending messages to each other!
Revolution is a blend between Falling Skies, Lost and The Event - even a bit of Terra Nova (family in a new world).
Watch the extended first trailer of Revolution.