The emissions were equal to the annual greenhouse gas emissions of more than 59,000 automobiles, according to the EPA’s greenhouse gas equivalency calculator. Under such a scenario Duke Energy would likely have years of low emissions punctuated by a single year of high emissions. While other utilities have participated for decades in a voluntary program with the EPA to reduce SF6 emissions to next to nothing, Duke Energy has not. Brooks said Duke Energy is also targeting its most leaky equipment for faster replacement. The figure is roughly half of 1% of all greenhouse gas emissions worldwide, far smaller than yearly emissions of carbon dioxide, the primary driver of climate change.

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