brooklyn is known the world over for things small-batch and local, like designer clogs, craft bourbon and artisanal sauerkraut.now, it is trying to add electricity to the list.in a promising experiment in an affluent swath of the borough, dozens of solar-panel arrays spread across row house rooftops are wired into a growing network. called the brooklyn microgrid, the project is signing up residents and businesses to a virtual trading platform that will allow solar-energy producers to sell excess-electricity credits from their systems to buyers in the group, who may live as close as next door.patrick schnell, a participant in the brooklyn microgrid, with solar panels on his roof in gowanus. photo: kevin hagen for the new york timesthe project is still in its early stages — it has just 50 participants thus far — but its implications could be far reaching. the idea is to create a kind of virtual, peer-to-peer energy trading system built on blockchain, the database technology that underlies cryptocurrencies like bitcoin.the ability to complete secure transactions and create a business based on energy sharing would allow participants to bypass the electric company energy supply and ultimately build a microgrid with energy generation and storage components that could function on their own, even during broad power failures.“community members can work both individually and colle...