Slate reports: Wind-generated electricity has become a big business in the United States. From virtually nothing a decade ago, it has boomed to account for about 5 percent of electricity generated each year. In certain states, at certain times, cheap, emission-free wind can account for a huge chunk of supply, as happened recently in Texas. Wind adds capacity in large chunks — a wind farm may consist of scores of turbines arrayed across vast expanses of land. So far this year, according to the Federal Energy Regulatory Commission, nearly 3 gigawatts of wind capacity has come online in the U.S., accounting for 40 percent of all new electricity-generating capacity.

But although the U.S. has become a global leader in wind, there’s a subsector in which it’s lagged behind: offshore wind.

Around the world, and especially in northern Europe, anchoring wind turbines to the bed of the sea—where the wind is consistent and strong—has become a huge business. Denmark has installed so many offshore wind turbines that it often produces far more wind power than it can actually use. Earlier this week, DONG Energy announced plans to develop the largest offshore wind farm in the world, an 87-turbine site off the coast of Wales with a capacity of 660 megawatts. That’s about the size of a decent coal-fired plant. [Continue reading…]