The article was later updated with a response from the Lamont campaign

> Officials with the Lamont campaign said their claims were based in part on savings that resulted from agreements the state has to by power generated New England's two remaining nuclear power plants, Millstone in Waterford and Seabrook in New Hampshire.

> Campaign officials, however, were unable to cite how much of an impact reduced costs for the power generated by nuclear plants had on the overall per kilowatt hour cost that Connecticut consumer pay overall for power. The majority of the electricity generated by power plants in New England comes from generating units that run on natural gas, so the cost per kilowatt hour is a combination of nuclear and natural gas costs

> The Lamont campaign also cited Connecticut's long standing practice of purchasing power using multiple auctions to determine the electric rates that consumers pay, thereby protecting them from price spikes

I didn't notice any additions to the article that added any more of Lamont's original quote. And googling I couldn't find it.