Boeing does have its own fire department. However, depending on how serious the situation is, they will call for help from the regular fire department. In the case of injury, Boeing will have Medic One take the patient if it is severe.
That was in the 40-30 building. The Boeing Fire Dept turned the power back on about 2 pm and there was a small explosion, and some people were trapped in one of the elevators. They finally got it fixed about 3 pm. What appears to be smoke in the msnbc/KING5 helicopter picture is actually fog.