Haddam Neck Nuclear Power Plant, also known as Connecticut Yankee Nuclear Power Plant, is located in East Hampton, Connecticut.  The Westinghouse PWR was operated by Connecticut Yankee Atomic Power Company until it was shutdown in November 1996.  Decommissioning activities began in 1998 and were completed by 2007.  The Connecticut Yankee Atomic Power Company is owned by 9 utilities:  Connecticut Light & Power Co. (34.5%); New England Power Co. (19.5%); Boston Edison Co. (9.5%); United Illuminating Co. (9.5%); Western Massachusetts Electric Co. (9.5%); Central Maine Power Co. (6%); Public Service Co. of New Hampshire (5%); Cambridge Electric Light Co. (4.5%); and Central Vermont Public Service Corp. (2%).

The ISFSI is for Haddam Neck is located about 3/4-mile from the former reactor plant area.  SNF from Haddam Neck was transferred to the ISFSI beginning in the first quarter of 2004 and was complete by March 2005.  There are 1,019 SNF assemblies stored in 40 dry casks.  Three additional dry casks are being used to store greater-than-class-c waste.  The casks are manufactured by NAC International — the NAC-MPC cask system and the MPC-26 canister type.  There are 412 metric tons of SNF stored at the Haddam Neck ISFSI.