Today marks a milestone for offshore wind energy in the U.S. with the official launch of a prototype floating turbine off the Maine coast, the first grid-connected offshore wind turbine deployed off the coast of North America. The 1/8-scale prototype VolturnUS, a 65-foot-high 20-kW turbine, will spend the summer being "de-risked" off the coast near Castine. Maine Senator Susan M. Collins did the honors, with a (scored) bottle of Madeira.