If energy generation doesn't match energy use, power cuts or overload is the result.
The best solution suggested so far is a concept known as the "virtual power plant", says Lang. Each virtual plant consists of several hundred or thousand microgenerators lumped together in cyberspace into a unit comparable to that of a large power station.
Looks like a pretty lousy solution to me. It requires aggregation and shuffling of electricity over significant distances. Storing and re-distributing locally would make much more economic sense.