The　power　market　is　changing　with　the　development　of　distributed　energy.　The　development　of　the　micro-grid　introduces　a　small　power　generation　system　for　distributed　energy.　It　has　become　a　trend　for　the　micro-grid　to　participate　in　the　power　market.　Blockchain　is　a　database　technology　with　transparent　distribution　through　a　decentralization　mechanism.　In　the　blockchain,　the　transaction　data　are　maintained　by　entire　nodes　in　the　power　market.　It　solves　the　trust　problem　between　the　transaction　agents.　Intelligent　contract　technology　can　make　transaction　contracts　computerized　and　executed　automatically,　which　has　dramatically　improved　transaction　efficiency.　In　this　paper,　an　intelligent　contract　for　the　power　transaction　is　analyzed　based　on　the　concepts　of　the　blockchain.　The　roles　of　the　micro-grid　and　the　related　intelligent　contract　technologies　in　the　power　market　are　also　investigated　in　the　electricity　reform.　Finally,　a　blockchain　scheme　for　point-to-point　trading　is　designed　for　future　purposes.　©　2020,　Springer　Nature　Singapore　Pte　Ltd.