The identification of the Parties in the Supplement is correct.
Each of AIC, ComEd, and MEC is an Adhering Party (but not a Regulated Entity) under the ISDA 2018 U.S. Resolution Stay Protocol (“ISDA Stay Protocol”). A supplier that is a “Regulated Entity” under the ISDA Stay Protocol has the option to execute the Supplement by mutual agreement of the Parties. In this context, “Regulated Entity” is a defined term under the ISDA Stay Protocol and does not take on its meaning in ordinary language.
Please consult the list provided here (https://www.isda.org/protocol/isda-2018-us-resolution-stay-protocol/adhering-parties) to determine whether an entity is a Regulated Entity under the ISDA Stay Protocol.