An electric power substation includes a circuit breaker that receives electrical power from a power plant, and a control house communicably coupled to the circuit breaker via a primary communication line, wherein one or more primary relay panels are housed within the control house. An electromagnetic pulse mitigation module is communicably coupled to the circuit breaker via a fiber optic line and comprises a continuous conductive enclosure that is impervious to radiated and coupled electromagnetic energy. One or more backup relay panels are housed within the electromagnetic pulse mitigation module and capable of assuming operation of the one or more primary relay panels.