Mayo A is Yukon energy's 69kV expansion of the Mayo substation.

FMI completed all the work for this substation expansion including the supply & erection of the steel structures, over head buses, disconnect switches and circuit breakers. Also included were the installation and termination of new HV cables as well as the new protection and control cables.

Work started in the spring of 2012 and was complete in the the spring of 2013