Miss. Code § 77-11-107
In order to determine whether or not each gas district or municipally owned and/or operated gas system or pipeline or privately owned or operated gas pipeline is operating in compliance with the required safety standards and to enforce such compliance, the Mississippi Public Service Commission shall have the right, power and authority to promulgate reasonable rules and regulations to facilitate such purpose. Authorized personnel of the commission shall be authorized to inspect all such gas districts, municipally or privately owned and/or operated gas systems, pipelines, facilities and equipment and shall have the right of access and entry to all buildings and property owned, leased and operated by such systems. Other information shall be made available to the commission upon request.
Miss. Code § 77-11-107