Texas Utilities Code - UTIL § 37.157. Maps

(a) An electric utility shall file with the commission one or more maps that show each utility facility and that separately illustrate each utility facility for the generation, transmission, or distribution of the utility's services on a date the commission orders.

(b) Each electric utility, transmission and distribution utility, electric cooperative, and municipally owned utility shall provide the utility's service area boundary map, using good faith efforts, in a geographic information system format to the commission. The service area boundary map may be provided to the commission in a geodatabase feature class or shapefile.