In this subchapter, "public utility" means and includes a private corporation that does business in this state and has the right of eminent domain, a municipality, or a state agency, authority, or subdivision engaged in the business of:

1. (1) generating, transmitting, or distributing electric energy to the public;
2. (2) producing, transmitting, or distributing natural or artificial gas to the public; or
3. (3) furnishing water to the public.

Acts 1997, 75th Leg., ch. 166, Sec. 1, eff. Sept. 1, 1997.