grid dancing through the ages

In 2006, Li and his colleagues began working on a hydraulic hybrid vehicle.

They were in the process of developing an energy storage system for that purpose when they realized that their idea was better suited to grid-scale energy storage.

And on the other hand….

Specifically, he teaches them that the food and bathroom waste they produce every day can be transformed by a biogas digester into fuel to clean and cook plus a compost to fertilize crops.

http://www.resilientcommunities.com/dont-throw-away-your-wealth/

One flame in a room.

There once were 10s of 1000s in old rural China; so simple, so common, but now?