The DC Circuit has found that the Federal Energy Regulatory Commission (FERC) adequately and reasonably explained its decision to adopt the index formula that governs pipeline rates for the 2016 to 2021 period. Oil pipeline rates are governed by an indexed ratemaking system, and each year FERC calculates the index used to set pipeline-specific rate ceilings by using a formula that captures the cost change in the oil pipeline industry. FERC reviews this formula every five years and adopted the most recent one on December 17, 2015 after a notice and comment rulemaking.
The Association of Oil Pipelines challenged the index formula for the 2016-2021 period on the grounds that FERC did not apply the same methodology used in prior index reviews. First, FERC relied solely on the middle 50% of pipeline cost-change data and did not incorporate the middle 80%. Second, FERC used Page 700 cost-of-service data to calculate the index level instead of the Form No. 6 accounting data it had used in the past.