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I checked the numbers. According to the EPA web site, the US
puts a couple hundred tons of mercury compounds into the air
annually. Of that "only" 50 tons is attributed to the electrical
power industry. If you pro-rate that over the total electrical
power on the order of 100 quads per year (not exactly right,
but close) that comes to something like 5e-13 grams of Hg
per watt of electricity.