(a) The commission has jurisdiction over an affiliate that has a transaction with a public utility under the commission's jurisdiction to the extent of access to a record of the affiliate relating to the transaction, including a record of joint or general expenses, any portion of which may be applicable to the transaction.
(b) A record obtained by the commission relating to sale of electrical energy at wholesale by an affiliate to the public utility is confidential and is not subject to disclosure under Chapter 552, Government Code.