18 CFR § 157.31 - Definitions.

---
identifier: "/us/cfr/t18/s157.31"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "18 CFR § 157.31 - Definitions."
title_number: 18
title_name: "Conservation of Power and Water Resources"
section_number: "157.31"
section_name: "Definitions."
chapter_name: "FEDERAL ENERGY REGULATORY COMMISSION, DEPARTMENT OF ENERGY"
subchapter_number: "E"
subchapter_name: "REGULATIONS UNDER NATURAL GAS ACT"
part_number: "157"
part_name: "APPLICATIONS FOR CERTIFICATES OF PUBLIC CONVENIENCE AND NECESSITY AND FOR ORDERS PERMITTING AND APPROVING ABANDONMENT UNDER SECTION 7 OF THE NATURAL GAS ACT"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "15 U.S.C. 717-717w, 3301-3432; 42 U.S.C. 7101-7352."
regulatory_source: "17 FR 7386, Aug. 14, 1952, unless otherwise noted."
cfr_part: "157"
---


# 157.31 Definitions.

(a) “Alaska natural gas transportation project” means any natural gas pipeline system that carries Alaska natural gas to the international border between Alaska and Canada (including related facilities subject to the jurisdiction of the Commission) that is authorized under the Alaska Natural Gas Transportation Act of 1976 or section 103 of the Alaska Natural Gas Pipeline Act.

(b) “Commission” means the Federal Energy Regulatory Commission.

(c) “Voluntary expansion” means any expansion in capacity of an Alaska natural gas transportation project above the initial certificated capacity, including any increase in mainline capacity, any extension of mainline pipeline facilities, and any lateral pipeline facilities beyond those certificated in the initial certificate order, voluntarily made by the pipeline. An expansion done pursuant to section 105 of the Alaska Natural Gas Pipeline Act is not a voluntary expansion.