Quoting from the news release:
"As growing swaths of the United States face dwindling water supplies and even outright drought, the U.S. electric sector already withdraws 42 trillion gallons of water each year — more than 200 billion gallons a day, the equivalent of more than half of the water flowing through the Ohio River each year. ...
"… we estimate that generators along the Ohio River withdraw so much water that for every gallon which spills into the Mississippi River at Cairo, IL, one cup has passed through a generator on the banks of the Ohio River, and one tablespoon has evaporated to the atmosphere …According to data collected by the United States Geographic Survey (USGS), water withdrawals from thermoelectric power sources account for 49 percent of total withdrawals in the United States in 2005. This is equivalent to more than 201 billion gallons of water per day that is used for power plant cooling alone."