The Path to Cleaner Energy
Wind power's role in weaning America off fossil fuels holds vast untapped potential for domestic energy production and green jobs.
Beyond bringing jobs to tens and eventually hundreds of thousands of Americans, can we expect wind energy to make a real difference in the way we fuel our economy? How much can we count on wind energy to rein in the pollution that is compromising our health and warming the Earth's atmosphere? And what will it cost us to make wind a major part of our energy diet?
Looking at wind energy's contribution today, it may seem premature--even presumptuous--to think of the technology as a game changer. During 2010, wind supplied 2.9 percent of America's power needs. Coal, during the same period, delivered 45 percent of our electricity, and natural gas generated another 24 percent, followed closely by nuclear power, with a 20 percent share of overall output. Another 6 percent of our electricity came from conventional hydroelectric dams, while solar energy--photovoltaics and thermal systems combined--barely registered a blip on the screen at 0.03 percent.
From the broader vantage point of energy use across all sectors, wind's current status looks humbler still. Electricity generation amounts to a little less than 40 percent of total U.S. energy consumption, with most of the rest relying on the direct burning of fossil fuels to run our vehicles, stoke our industries, and heat our buildings. So that means wind meets slightly more than 1 percent of our overall energy needs.
Wind energy's role in weaning America off fossil fuels may be modest today, but its untapped potential is vast. In February 2010, the government-run National Renewable Energy Laboratory (NREL) released the results of a mapping effort that gauges the full magnitude of land-based wind energy as a resource that can serve America's the path to cleaner energy power needs. First NREL identified "windy land areas," which it defined as areas where the average winds are strong enough, at 80 meters (262 feet) above ground, to allow turbines to produce electricity at a minimum of 30 percent of their full installed or "nameplate" capacity, averaged annually. (A 30 percent "capacity factor" is considered moderately robust.) Areas with annual wind speeds averaging at least 14.6 miles per hour were regarded as meeting this threshold.
From this gross measure, NREL then subtracted territory that it deemed unlikely to be developed for wind because of conflicting uses or characteristics--urban areas, parks, designated wilderness, and areas with water features that could hinder wind development.
In my home state of Massachusetts, NREL rated less than 1 percent of the state as sufficiently windy, and it disqualified 88 percent of that small area because of conflicts. At the other end of the spectrum is Kansas, where almost 90 percent of the land meets the threshold for windiness, and only 10 percent of that windy area has been sidelined by NREL because of conflicts.
I remember loving those spin art kits that were toy store staples in the 1960s. After dribbling paints from ketchup-like dispensers onto a rectangular sheet of cardboard, I'd flip the switch of a battery-operated spinning wheel. Within seconds, a swirling, sometimes lurid maelstrom of colors emerged. On first glance, NREL's digitized wind map of the United States reminds me of those creations. In the Southeast, spring green splashes across the Atlantic coastal states, reaching as far inland as Tennessee, Alabama, and eastern Mississippi.
Adding up all the qualifying windy areas, NREL projects that America could install up to 11,000 gigawatts of land-based wind power, yielding roughly 38.5 million gigawatt hours of electricity per year. That's nine times our total electricity production today!