The Supreme Court’s ruling on the Mountain Valley Pipeline came on July 27, 2023, in a brief, unsigned emergency order with no recorded dissents. The Court vacated three stays that the U.S. Court of Appeals for the Fourth Circuit had issued on July 10 and July 11, clearing the way for construction to resume on the 303-mile natural gas pipeline running from West Virginia to Virginia.1Office of the General Counsel, U.S. House of Representatives. Supreme Court Order in Mountain Valley Pipeline, LLC v. Wilderness Society, et al. The order was procedural. It did not decide the constitutional question at the heart of the dispute, and the Court issued no written opinion explaining its reasoning.
The practical effect was decisive anyway. Construction resumed, and the pipeline entered commercial service less than a year later, on June 14, 2024.2U.S. Energy Information Administration. New Mountain Valley Pipeline to Begin Operations
The Statute Behind the Order
To understand what the Supreme Court did, you have to start with what Congress did a month earlier. In June 2023, Congress passed the Fiscal Responsibility Act, a bill primarily aimed at raising the federal debt ceiling. Section 324 of that act specifically targeted the Mountain Valley Pipeline. Its inclusion was reportedly a concession to secure the vote of Senator Joe Manchin of West Virginia, then chair of the Senate Energy and Natural Resources Committee.3U.S. Senate Committee on Energy and Natural Resources. Manchin Statement on Mountain Valley Pipeline Resuming Construction
Section 324 did three things. It declared the pipeline’s completion to be in the national interest. It ratified and approved every federal authorization, permit, biological opinion, and other approval the pipeline needed for construction and initial operation. And it directed the Secretary of the Army to issue all remaining water-crossing permits within 21 days.4U.S. Congress. H.R.3746 – Fiscal Responsibility Act of 2023 – Enrolled Text
The most contested provision stripped federal courts of the ability to review any government action granting an authorization necessary for the pipeline. The statute left one narrow opening: constitutional challenges to Section 324 itself could be filed, but only in the U.S. Court of Appeals for the D.C. Circuit. That bypassed the Fourth Circuit, where opponents had won repeatedly for years.4U.S. Congress. H.R.3746 – Fiscal Responsibility Act of 2023 – Enrolled Text
Why the Fourth Circuit Stopped Work Anyway
On July 10, 2023, roughly a month after the Fiscal Responsibility Act became law, the Fourth Circuit issued stays halting construction in the Jefferson National Forest. The court froze work while it considered challenges to the Interior Department’s record of decision authorizing pipeline construction in the national forest. In doing so, it continued to exercise the very jurisdiction Congress had just tried to remove.
That set up the collision the Supreme Court was asked to resolve. The pipeline’s developers had a federal statute saying courts could not block the project. A federal appeals court had blocked it anyway. The developers filed an emergency application asking the Supreme Court to vacate the Fourth Circuit’s stays.
What the Court Decided, and What It Did Not
The order vacated the stays. That is all it did on the merits. There was no written opinion, no analysis of Section 324, and no recorded dissent.1Office of the General Counsel, U.S. House of Representatives. Supreme Court Order in Mountain Valley Pipeline, LLC v. Wilderness Society, et al.
Several things the Court did not do are worth stating plainly. It did not rule on whether Section 324 is constitutional. It did not address whether Congress can strip courts of jurisdiction over a specific pending case. It did not issue precedent that lower courts must follow on those questions in future cases.
Emergency orders from the Supreme Court are procedural tools. The Court saw enough to conclude the stays should be lifted, but it did not explain why. That left the legal doctrine essentially unchanged even as the construction situation on the ground changed dramatically.
The Separation-of-Powers Question That Remains Open
The core controversy is whether Congress can pass a law that decides who wins in a specific, active court case. The question sits between two constitutional principles. Congress has broad authority to regulate interstate commerce and to define the jurisdiction of federal courts. The separation of powers reserves the judicial function to the courts.
The most relevant precedent is the 1871 Supreme Court decision in United States v. Klein. The Court there struck down a statute because Congress had effectively prescribed the outcome in a pending case, holding that a law dictating how a court must rule crossed the line between legislative and judicial power.5Justia Law. United States v. Klein, 80 U.S. 128 (1871)
Section 324’s opponents argue it does what Klein forbids. Rather than changing the underlying law in a general way, Congress identified a single project, ratified every permit it needed, and barred courts from reviewing any of them. Supporters counter that Congress has legitimate authority over interstate energy infrastructure and that Section 324 changed the applicable law rather than directing a judicial outcome.
Because the Court’s emergency order did not reach this question, and because the pipeline was completed before the D.C. Circuit fully resolved the constitutional challenges, the issue may never get a definitive answer in this case. The question will resurface the next time Congress attaches a project-specific approval to must-pass legislation.
What Followed the Order
With the Fourth Circuit’s stays vacated, construction crews returned to the pipeline route. The project entered commercial service on June 14, 2024, after satisfying remaining regulatory requirements, including conditions set by the Pipeline and Hazardous Materials Safety Administration.2U.S. Energy Information Administration. New Mountain Valley Pipeline to Begin Operations The pipeline can transport up to 2 billion cubic feet of natural gas per day to markets in the Mid-Atlantic and Southeast. Its final cost came to approximately $9.6 billion according to a late 2024 FERC filing, well above original estimates.
The Federal Energy Regulatory Commission had originally authorized construction in October 2017.6Federal Energy Regulatory Commission. Mountain Valley Pipeline Original Filing Nearly seven years passed between that authorization and commercial operation, with environmental groups and landowners challenging the route through sensitive areas including the Jefferson National Forest and the Appalachian Trail.
One Boundary Worth Knowing: the Southgate Extension
Section 324’s protections do not travel with the pipeline company to new projects. The developers have proposed the Southgate Amendment, an approximately 31.3-mile extension from Pittsylvania County, Virginia, to Rockingham County, North Carolina. They filed the application with FERC in February 2025, and Virginia’s Department of Environmental Quality issued a water permit for the project in January 2026.7Virginia Department of Environmental Quality. Mountain Valley Pipeline – Southgate Amendment
Section 324 covered the Mountain Valley Pipeline as described in the original FERC dockets. The extension is a separate proceeding.4U.S. Congress. H.R.3746 – Fiscal Responsibility Act of 2023 – Enrolled Text Opponents of the Southgate project can challenge it through the ordinary court system. The extraordinary congressional intervention that defined the end of the main pipeline’s legal fight does not apply.