The numbers range from $1 million to more than $208 million to keep nuclear power operating in New York State.

They're costs members of the Green Alliance of New York say are concerning. 

"The state has been emphasizing the impact just to resident customers and really downplaying anything else," said Alliance member Jessica Maxwell. "But we could be seeing a ripple effect of property taxes, school taxes, we could see some of our local corporations or businesses impacted by their utility costs going up."

The study looks at past municipalities' usage and the costs anticipated with the zero emission credits. While the figures are just estimates, they say the overall impact will be drastic. 

"So it's going to affect commercial customers; it's going to affect municipalities, because they are also electric customers," Maxwell said. "It's going to affect public schools, everybody. Every institution that has an electric bill is going to see their rates increase."

For cities like Syracuse, that cost is more than $1.4 million over 12 years. But Mayor Stephanie Miner says for her, there are bigger issues at hand. 

"There are tradeoffs with any decision that you make," the mayor said, "but that kind of differential pales in comparison to when we see our pension bills go up 20-30 percent."

In a statement, an Exelon spokesperson called AGREE's economic analysis quote "flawed," and added that in a different independent study, it showed consumers would pay $1.7 billion in higher energy costs every year without the plants.

Other groups are also firing back at the new report. The Upstate Jobs Coalition called the study unsubstantiated, and says those plants are needed for clean and reliable energy in the future.