BLM Opens Environmental Review of Pattern Energy’s 330-Mile Silver Rock Line Between Utah and Nevada

The Bureau of Land Management started a formal environmental review on September 3 of the Silver Rock Transmission Line Project. Silver Rock Transmission, LLC, a subsidiary of Pattern Energy, LP, has applied for a right-of-way to build the 330-mile link from Millard County, Utah to Clark County, Nevada. The notice of intent appears at 91 FR 56664. It covers up to two new high-voltage interstate transmission lines with a nominal voltage of up to 600 kilovolts. Public scoping comments are due October 5, 2026. BLM holds two Zoom scoping meetings first, on September 17 and September 18.

BLM shares the decision with the Bureau of Reclamation. Each agency answers for the lands it administers. The route also crosses private and state ground, and those owners run their own permitting tracks.

Before and After

Before September 3, Silver Rock held a schedule but no environmental record. The Federal Permitting Improvement Steering Council granted the project FAST-41 coverage on December 9, 2025, which put its federal milestones on the public Permitting Dashboard and named BLM the lead agency. FAST-41 sets deadlines for agencies. It does not analyze a single acre.

After September 3, the analysis itself begins. The notice puts three alternative routes into the record, all assessed by Silver Rock Transmission, LLC as contingency options. It also fixes the physical footprint the agency will study: a combined right-of-way width of 450 to 650 feet inside a siting corridor of up to 2,500 feet. BLM lists the preliminary issues it expects to weigh, starting with biological resources.

Why It Matters

Neither BLM, Pattern Energy nor the Permitting Council has published a transfer capacity for Silver Rock. What the notice actually says is that the application covers up to two new high-voltage interstate transmission lines and associated Project facilities with a nominal voltage of up to 600 kilovolts. That is the envelope the right-of-way application asks BLM to study. No filing on the public record describes a finished line design at that voltage.

What the filings do say is where the power goes. The Permitting Council describes the project as carrying geothermal energy out of central Utah and supporting data center growth in and around Las Vegas and Salt Lake City. Pattern calls it an open-access line. Latitude Media, reporting on western transmission on September 10, placed it among the projects that would reach enhanced geothermal and solar in central Utah, near Fervo Energy’s Cape Station.

Pattern finished the 550-mile SunZia line this year after roughly two decades of permitting. Silver Rock enters scoping in 2026. The Permitting Dashboard timetable and the two-decade SunZia record are the two numbers to hold side by side.

Enforcement Reality

The October 5 date is not a filing deadline in the usual sense. Nothing is rejected for lateness. The notice asks for comments by October 5, 2026, or 15 days after the last scoping meeting, whichever falls later.

The cost of silence lands later. Scoping is where the range of alternatives gets set. An issue raised now becomes something the agency has to answer in the draft EIS. The same issue raised after the draft arrives is weaker, because the administrative record already shows the agency was not asked. Developers and counties understand this. Individual landowners along 330 miles of route often do not.

BLM states three possible outcomes for the application: approve it, approve it with modifications, or deny it. The purpose-and-need section cites Executive Order 14154, Unleashing American Energy, alongside Title V of the Federal Land Policy and Management Act and the Reclamation Act of 1902.

Critical Perspective

Read the notice closely and the project is thinner than the mileage suggests. BLM is not reviewing a transmission line. It is reviewing a right-of-way application for up to two lines at up to 600 kilovolts, inside a corridor of up to 2,500 feet, with three contingency routes that Silver Rock Transmission, LLC assessed itself. The applicant set the alternatives the agency will now weigh. Scoping exists to add others, which is the whole reason the October 5 date matters to anyone who is not Pattern Energy.

The schedule is the second thing worth doubting. FAST-41 coverage arrived on December 9, 2025. Scoping opened on September 3, 2026, nine months later. FAST-41 is a coordination tool, and coordination started before the analysis did. Pattern’s own SunZia line needed roughly two decades to reach service. Nothing in this notice speaks to that gap.

Then there is the question of what the line is for. Pattern describes an open-access line reaching geothermal in central Utah. The Permitting Council describes a line supporting data center growth around Las Vegas and Salt Lake City. Both statements fit an open-access line, because open access means the owner does not decide who ships. Whether this corridor ends up moving geothermal output or firming data center load is not settled by anything on the record today, and the EIS will not settle it either.

One more line in the purpose and need deserves attention. BLM cites Executive Order 14154 alongside the two statutes. Title V of FLPMA and the Reclamation Act of 1902 outlast administrations. Executive orders do not.

Sources

• Federal Register: Intent To Prepare an EIS for the Proposed Silver Rock Transmission Line Project (91 FR 56664)
• BLM: BLM Proposes Utah/Nevada Transmission Line to Strengthen Power Grid
• Permitting Council: The Silver Rock Transmission Project is the Latest to Gain FAST-41 Coverage
• Latitude Media: Is the West on the cusp of a transmission breakthrough?
• Pattern Energy: Silver Rock Transmission project page

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