McClatchy Newspapers: Led by billionaire Texas oilman T. Boone Pickens, pioneers in the emerging wind-power industry are touting their product as the next big thing as they chart a course to produce at least 20 percent of the nation’s electricity in just over two decades. But reaching that goal won’t be easy. The most daunting challenge centers on the fundamental question of how to get the product to customers. That will require building thousands of miles of transmission lines to carry electricity from …