What is SolarCoin?

SolarCoin is a digital currency rewarding solar energy producers. Launched in January 2014 and inspired from BitCoin and BlockChain Tech whereby transactions are recorded and validated by a peer to peer network of computers, SolarCoin presents the additional advantage of being a tangible virtual currency: in fact, by coupling each MWh of solar electricity produced by a photovoltaic system to the production of a SolarCoin, the virtual world joins our physical world. Put another way, one can also understand that SolarCoin works as Solar-Miles: any solar owner receives SolarCoins for electricity that his photovoltaic installation generates… and it’s free!

Source: What is SolarCoin?