(a) If, in acting under this chapter, it is necessary for a municipality or other governmental entity to exercise the power of eminent domain, a police power, or any other power in order to make an alteration, including relocating, raising, lowering, rerouting, changing the grade, or altering the construction of a railroad, electric transmission, telegraph or telephone line, conduit, pole, property or facility, or pipeline outside the corporate limits of municipalities, the alteration shall be made at the sole expense of the municipality or other governmental entity.
(b) In this section, "sole expense" means the actual cost of an alteration made under Subsection (a) and of the provision of a comparable replacement without enhancement of the facility, after deducting the net salvage value derived from the old facility.