[1] As of 2024 the plant consisted of eight separate generating units: Mystic 8 and 9 were combined cycle natural gas units with a total of four combustion turbines and two steam turbines which could produce 1414 MW total; Mystic 7 was a natural gas or petroleum unit which produced 576 MW; and Mystic Jet was a small petroleum fueled unit which produced 8.6 MW in periods of high demand.

[5] Sithe was acquired by Exelon in late 2003[6] who ran into financial difficulties which resulted in BNP Paribas taking control of the station.

Boston Generating ended up declaring chapter 11 bankruptcy in 2010 and was sold to Constellation Energy.

[11] Other groups have also become concerned that the plant relies too heavily on Distrigas Liquefied Natural Gas from Yemen which has been experiencing political unrest.

Once an upgrade project was selected ISO-NE announced that Mystic Station would be allowed to fully retire on June 1, 2024.