The regulatory authority may not consider for ratemaking purposes:
(1) an expenditure for legislative advocacy, made directly or indirectly, including legislative advocacy expenses included in trade association dues;
(2) a payment made to cover costs of an accident, equipment failure, or negligence at a utility facility owned by a person or governmental entity not selling power in this state, other than a payment made under an insurance or risk-sharing arrangement executed before the date of loss;
(3) an expenditure for costs of processing a refund or credit under Section 36.110; or
(4) any other expenditure, including an executive salary, advertising expense, legal expense, or civil penalty or fine, the regulatory authority finds to be unreasonable, unnecessary, or not in the public interest.