Water cooling technology ("once through") kills too many fish etc. so violates the Clean Water Act. On Friday, New York state’s Department of Environmental Conservation denied a water quality permit which the plant would need in order to renew its federal operating license, due to expire in 2013.
The denial was not conditional -- it is apparently not clear whether retrofitting a closed cycle cooling system would lead to a state water quality permit.
I was a little surprised by this:
Units 2 and 3 run through "a combined 2.5 billion gallons a day, or more than twice the water consumed in the five boroughs of New York City"