At 1613 Engine 12 was dispatched to assist Aetna (Newark) for a electrical fire in a commercial building with a injury. Engine 12 arrived and was directed to the rear of the building by command. Engine 12 arrived and secured a water supply. An attack line was stretched into the building where crews found a electrical fire that had extended to the building. The fire was held in check while the power was secured. The fire was extinguished and the area was overhauled. The injured person was transported to Christiana hospital by EMS. Engine 12 remained on the scene for a hour.