Rapid growth has come to alternative energy. Wind power generation grew more than tenfold in the U.S. in the 2000s, while funding for solar startups soared past many information technology sectors. But in the 2010s, feed-in tariffs will decrease, and many renewable electricity sources will approach cost parity with fossil-fuel sources. As a result, manufacturers and investors will increasingly depend on production economics, not global politics, to achieve high returns on invested capital.