On November 21, 2019, FERC announced that public utilities with transmission formula rates must revise those rates to account for changes in accumulated deferred income taxes (“ADIT”) resulting from the Tax Cuts and Jobs Act of 2017 (“TCJA”). Utilities with transmission formula rates under an Open Access Transmission Tariff, a transmission owner tariff, or a rate schedule must:
- include a mechanism to deduct any excess ADIT from, or add any deficient ADIT to, their rate base in order to ensure rate base neutrality (the “Rate Base Adjustment Mechanism”);
- return to, or recover from, customers any excess or deficient ADIT through an adjustment to the formula rate’s income tax allowance (“Income Tax Allowance Adjustment Mechanism”); and
- incorporate a new permanent worksheet into the formula rate to annually track ADIT amounts.
FERC declined to adopt any compliance requirements for transmission stated rates, finding that the utility’s next rate case would be the most appropriate place to address excess or deficient ADIT resulting from the TCJA. Compliance filings are due the later of: (1) 30 days from the effective date of the final rule; or (2) the utility’s next informational filing following the final rule.