The project would power the equivalent of only 61,600 of Maryland's 2.1 million households. However, clean-energy advocates say it could signal the emergence of an industry that has so far been unable to erect a single tower in U.S. waters, giving the project impact beyond its megawatts."You have to start with initial steps, sometimes small steps, and that's what this Maryland bill is," said Mike Tidwell, director of the Chesapeake Climate Action Network in Takoma Park, Maryland.The project has attracted interest from the U.S. unit of Electricite de France SA and may eventually be linked by an undersea transmission backbone Google Inc. is helping