On September 17, 2021, in Docket No. RP21-1126-000, Portland Natural Gas Transmission System ('PNGTS') submitted a tariff filing with the Federal Energy Regulatory Commission ("Commission"). In its filing PNGTS submitted certain tariff sections to comply with the Commission's June 18, 2020, Order Issuing Certificate in Docket No. CP20-16-000. The tariff sections place into effect a modified fuel retainage mechanism related to PNGTS's Westbrook XPress Project. PNGTS requested that the Commission accept the tariff records to become effective November 1, 2021.