This case presents three sets of issues arising from Texass transition from a wholly regulated retail electricity market. First, we will consider the extent to which the Public Utility Commission had power to order electric utilities to refund alleged "over-mitigation" of their stranded costs, as determined from interim computer models, before the final 2004 true-up proceedings. Second, we will determine whether substantial evidence supports the Commissions characterization of Nuclear Electric Insurance Limited (NEIL) account balances as generation-related rather than transmission-related. Third, we will address whether the Commission may set demand charges for large commercial customers greater than those it set before deregulation. Because we determine that the Commission exceeded its statutory authority in ordering refunds of "over-mitigated" stranded costs determined before the 2004 true-ups, we will reverse the portion of the district courts judgment compelling such refunds and remand to the Commission for further proceedings. However, we will affirm the district courts judgment affirming the Commissions disposition of the issues concerning NEIL member accounts and demand charges.
