Why Wind Power Isn’t the Answer

...Four days earlier, to much less fanfare, two Harvard researchers published a paper showing that trying to fuel our energy-intensive society solely with renewables would require cartoonish amounts of land. How cartoonish? Consider: meeting America’s current demand for electricity alone—not including gasoline or jet fuel, or the natural gas required for things like space heating and fertilizer production—would require covering a territory twice the size of California with wind turbines. The renewables-only proponents have no trouble mobilizing against land use for the extraction of hydrocarbons. Consider the battle in Colorado over Proposition 112, which will prohibit oil- and gas-drilling activities within 2,500 feet of homes, hospitals, schools and “vulnerable areas.” Environmental groups including 350.org, the Sierra Club, and Greenpeace have endorsed the initiative, which will appear on the November 6 ballot. If it passes, Proposition 112 would effectively ban new oil and gas production in Colorado, the nation’s fifth-largest natural gas producer. Or consider the months-long demonstrations that ended last year in South Dakota over the Dakota Access pipeline. More than 700 climate-change activists and others were arrested during protests claiming that Dakota Access, by crossing the traditional lands of the Standing Rock Sioux, was violating the tribe’s cultural and spiritual rights. These energy- and land-use battles are waged by climate activists and environmental groups whose goal is to shutter the hydrocarbon industry. Most of these groups, including 350.org and Sierra Club, routinely claim that the American economy can run solely on renewables. Further, the Sierra Club has tallied 74 U.S. cities that have pledged to get all of their electricity from renewable energy. But the new study, published in Environmental Research Letters, shows yet again that wind energy’s Achilles heel is its paltry power density. “We found that the average power density—meaning the rate of energy generation divided by the encompassing area of the wind plant—was up to 100 times lower than estimates by some leading energy experts,” said lead author Lee Miller, a postdoctoral fellow who coauthored the report with Harvard physics professor David Keith. The problem is that most estimates of wind energy’s potential ignore “wind shadow,” an effect that occurs when turbines are placed too closely together: the upwind turbines rob wind speed from others placed downwind. The study looks at 2016 energy-production data from 1,150 solar projects and 411 onshore wind projects. The combined capacity of the wind projects totaled 43,000 megawatts, or roughly half of all U.S. wind capacity that year. Miller and Keith concluded that solar panels produce about 10 times more energy per unit of land as wind turbines—a significant finding—but their work demands attention for two other reasons: first, it uses real-world data, not models, to reach its conclusions, and second, it shows that wind energy’s power density is far lower than the Department of Energy, the IPCC, and numerous academics have claimed. Further: “While improved wind turbine design and siting have increased capacity factors (and greatly reduced costs), they have not altered power densities.” In other words, though Big Wind has increased the size and efficiency of turbines—the latest models stand more than 700 feet tall—it hasn’t been able to wring more energy out of the wind. Due to the wind-shadow effect, those taller turbines must be placed farther and farther apart, which means that the giant turbines cover more land....MORE