Utilities subject to Pennsylvania Public Utility Commission regulation shall be exempt from requirements of this chapter with regards to safety signs, essential service structures no greater than 100 square feet in size and four feet in height, poles for electric, telephone, and fiber optic line, subsurface wire and conduit, and underground piping. Other public utility structures and buildings, including, but not limited to, telecommunications towers, sewage treatment plants and substations, must comply with all use and setback requirements for the applicable zoning district.