No new nuclear plants have been built in the US in the past 20 years. The Watts Bar plant was licenced in 1996, but had been built much earlier. The last plant actually built was the River Bend plant in Louisiana, which was licenced in 1986.
There are currently 65 commercially operating nuclear power plants in 31 states around the country. 36 of the plants have two or more reactors, leading to a total of 104 nuclear reactors.
You can see a complete list by going to www.nrc.gov and go to 'Nuclear Reactors'. This site also shows sites of proposed new reactors (as at present)
104 operating power reactors
Sweden currently has 3 active nuclear power plants with 10 reactors.
Nuclear energy is generated in nuclear power plants, of which there are many.
Nuclear power plants emit no greenhouse gases at all.
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104 operating Nuclear Power units
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104 operating reactors
See link below
See link below