When sudden or unanticipated generation or transmission outages cause an overloading of an electric entity's facilities or interconnection circuits that operate at a nominal sixty hertz, that electric entity shall perform any or all of the following actions, as applicable:
(A) Interrupt service to customers served under interruptible tariffs or contracts.
(B) Interrupt service to firm service customers.
(C) Reduce voltage by not more than five per cent if the transmission system is isolated.
(D) Disconnect the overloaded facility or circuit.
The provisions of this rule do not apply to any municipal or cooperative unless the governor has declared an energy emergency under section 4935.03 of the Revised Code.