(a) The commission has jurisdiction over affiliated interests having transactions with utilities under the jurisdiction of the commission to the extent of access to all accounts and records of those affiliated interests relating to such transactions, including, but not limited to, accounts and records of joint or general expenses, any portion of which may be applicable to those transactions.     
      (b) The owner of a utility that supplies retail water service may not contract to purchase wholesale water service from an affiliated supplier for any part of that owner's systems unless:      
        (1) the wholesale service is provided for not more than 90 days if service discontinuance or serious impairment in service is imminent or has occurred; or       
        (2) the commission determines that the utility cannot obtain wholesale water service from another source at a lower cost than from the affiliate.       
     Source Note:        The provisions of this §24.31 adopted to be effective October 17, 2018, 43 TexReg 6826