For years, it's been an article of faith among advocates of renewables that increased use of wind energy can provide a cost-effective method of reducing carbon dioxide emissions. The reality: wind energy's carbon dioxide-cutting benefits are vastly overstated. Furthermore, if wind energy does help reduce carbon emissions, those reductions are too expensive to be used on any kind of scale.
Those are the findings of an exhaustive new study, released today, by Bentek Energy, a Colorado-based energy analytics firm. Rather than rely on computer models that use theoretical emissions data, the authors of the study, Porter Bennett and Brannin McBee, analyzed actual emissions data from electric generation plants located in four regions: the Electric Reliability Council of Texas, Bonneville Power Administration, California Independent System Operator, and the Midwest Independent System Operator. Those four system operators serve about 110 million customers, or about one-third of the U.S. population.
AWEA claims that every megawatt-hour of electricity produced by wind turbines cuts carbon dioxide emissions by 0.8 tons. But the Bentek study shows that in California, a state that relies heavily on natural gas-fired generation, the carbon dioxide reduction from wind energy was just 0.3 tons of carbon dioxide per megawatt-hour. Further, the study found that in the area served by the Bonneville Power Administration, which uses a large amount of hydropower, the carbon dioxde reduction was just 0.1 ton of carbon dioxide per megawatt-hour.
To be clear, the Bentek study found that in the region served by the Midwest Independent System Operator, which relies heavily on coal-fired generation, the carbon dioxide reduction benefits of wind are actually greater (1.0 ton of carbon saved) than what AWEA claims. But when it came to reductions in sulfur dioxide and nitrous oxide in the Midwest, Bentek found that, again, the claims made by AWEA were overstated.
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