Unless otherwise permitted by the commission, all records required by these sections or necessary for the administration thereof shall be kept within the State of Texas at a central location or at the main business office located in the immediate area served. These records shall be available for examination by the commission or its authorized representative between the hours of 8:00 a.m. and 5:00 p.m. Monday through Friday, except holidays. The commission may consider alternate hours of inspection if the utility provides a written request 72 hours in advance of any scheduled inspection.