Just before the holidays, the Federal Regulatory Commission issued its final decision on the oil pipeline index rate for the next five years. The what?? Well, once rates for interstate oil pipelines are set and accepted by FERC, the rates can move around to match the market, but any increases are capped by an annual index announced by the FERC each year. The index is equal to the current year’s inflation rate, plus an “adder” that is calculated by the FERC every five years based on an examination of the industry’s results from the previous five years. In today’s blog, we explain how a few tweaks in the way FERC calculates the cost-of-service-based adder will significantly affect how much liquids pipeline rates can rise through the first half of the 2020s.

