Tex. Natural Resources Code § 141.018

Members and employees of the commission, on proper identification, may enter public or private property to inspect and investigate conditions relating to the exploration, development, and production of geothermal energy, to monitor compliance with a rule, permit, or other order of the commission, or to examine and copy, during reasonable working hours, those records or memoranda of the business being investigated. Members or employees acting under the authority of this section who enter an establishment on public or private property shall observe the establishment's safety, internal security, and fire protection rules.