Wall Street  Journal -- The fate  of what would be the nation's first offshore wind farm is calling attention to  the political obstacles facing renewable power, despite President-elect Barack  Obama's determination to greatly expand its use.
 Supporters say it will deliver annual reductions in  greenhouse-gas emissions equivalent to taking 175,000 cars off the road.  Opponents warn it will industrialize Nantucket Sound, a popular summer  playground, and interfere with fishing and recreation. Some time before Mr.  Obama is inaugurated Jan. 20, the Bush administration is expected to publish a  review of the expected environmental impact of the project, resolving the last  major regulatory hurdle blocking the project in Washington.
 The conflict over Cape Wind illustrates a persistent  problem for renewable power. Policy makers and environmentalists love the idea  of generating clean power from the sun, wind, water and geothermal sources to  displace imported oil. But at the local level, there is often opposition to the  hardware needed to make renewable power work: big windmills, acres of solar  panels and large-scale transmission lines.
 Resolving such conflicts will be  critical if Mr. Obama's administration is to achieve his goal of generating at  least 25% of the nation's electricity from renewable sources by 2025. Wind,  solar and geothermal energy currently account for less than 1% of U.S.  electricity supply.
 The Energy Department concluded  last year that wind energy could generate 20% of the nation's electricity by  2030. But that would happen only if a "superhighway" transmission system is  created to carry wind power from sparsely populated areas to states and cities  that need the energy.
 "You can build wind farms  all day, but unless you have eminent domain to allow you to build a 1,000-mile  transmission line, it won't work," says James Rogers, chief  executive of North Carolina-based Duke Energy Corp.,