Just before 9pm Baltimore County 911 center received multiple calls for a transformer on fire on Cockeysmill Road.  When engine 413 arrived, they found fire in several levels of the equipment inside the BGE substation.  Additional resources including water supply and foam units were requested.  All units staged until the arrival of BGE crews.  BGE personnel determined that the fire was in several capacitor banks.  BGE personnel shut down the electric supply to the capacitor banks and grounded the capacitors.  The ladder truck was moved into position to allow crews to extinguish the remaining fire.  All units were cleared within 2 hours.