Nine European countries have teamed up to plan a 30-billion-euro (43-billion-dollar) sustainable energy project in the North Sea as part of efforts to address climate change and expand renewable energy, officials said Wednesday. The plan is to connect up the alternative energy projects of the nine nations to create Europe's first renewable electricity grid through a 6,000-kilometer network. The network would link the wind turbines off from the northern coast of Scotland with Germany's solar power industry and include the wave power plants dotted along the Danish and Belgian coasts and hydroelectric dams in Norway. It is expected to take a decade to complete the building work for the network, with the nine nations to unveil a feasibility plan later this year.