Cynergy performed a circuit breaker, forced fan and fan controller replacement project with a contract value of $3.077 million at the Fort McHenry Tunnel for the Maryland Transportation Authority. The twelve existing double-ended substations are over 30 years old and fed the lighting, power circuits and ventilation fans in the East and West bound tunnels. Keeping the emergency circuits energized during the breaker and transformer upgrades was a critical part of the project. Only half of each substation was allowed to be completed at a time. Temporary circuits had to be installed from another substation to allow the critical circuits to remain in operation.  The work had to be closely coordinated and monitored by the Authority during the entire replacement process.

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