Transformer Explodes at MA Power Substation

Officials are still trying to determine the cause of a transformer explosion at a power station in Lexington.

Firefighters told WCVB that one possibility could be the demand for electricity due to the hot temperatures.

Crews sprayed water on the 16-foot transformer for more than an hour Monday night. 

There were no injuries and no one in the area lost power. 

One witness told reporters: "We started to hear scratching and little clicking noises. We looked over and see this giant explosion."

Firefighters rotated crews as they battled the heat as well as the flames.