Would you be interested in giving this decentralized marketplace a try?
There are multiple advantages to this type of solution, as buyers and sellers know exactly who they are dealing with and where the solar energy is coming from. In fact, the first transaction on the TransActive Grid platform took place on Monday, April 11, 2016. Robert Sauchelli and Eric Frumin — both living in the Park Slope neighborhood in Brooklyn — completed a peer-to-peer energy transaction using US Dollars.
https://news.bitcoin.com/2-brooklyn-neighbors-just-traded-solar-energy-via-ethereum/