Keep your eyes on the CHIA project.  http://chia.network

Their tag line is "green money for a digital world".

The guy who started bitTorrent, Bram Cohen, is behind it and he's been bringing together a team of experienced people in the space from San Fran.

They're building a blockchain based on proofs of space and time "to make a cryptocurrency which is less wasteful, more decentralized, and more secure."

Looks like Q2 they expect to have it going.

Anyone can join their announcements list on their site.

Looks pretty interesting.