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United States. Federal Energy Regulatory Commission

Millville Hydroelectric Project License Article 403 Deviation Report

Strategic Insights

— 1 min read

The Millville Hydroelectric Project, operated by PE Hydro Generation, LLC, is required to maintain a minimum flow of 200 cubic feet per second (cfs) to the bypassed reach as a veil flow over the dam. However, due to the planned minor drawdown for the 2025 annual safety inspection, the company deviated from this requirement. The deviation was approved by the Federal Energy Regulatory Commission (FERC) on May 27, 2025, and PE Hydro reports that the deviation occurred on June 13, 2025.

Key Takeaways:

  • PE Hydro Generation, LLC deviated from the minimum 200 cfs veil flow over the dam to perform the 2025 annual safety inspection of the Millville Hydroelectric Project.
  • The deviation was approved by FERC on May 27, 2025, and PE Hydro reported the completion of the deviation within 10 days as required.
  • The deviation lasted for approximately seven and a half hours, from 7:46 am to 3:10 pm on June 13, 2025.
  • Downstream minimum flows were maintained at all times, including during refilling.
  • PE Hydro did not observe any adverse environmental impacts as a result of this planned deviation.
  • The veil height of 2.5 inches across the dam is equivalent to a 200 cfs flow.
  • The deviation was reported in accordance with the Operations Compliance Plan for Millville, dated January 2019, and approved by FERC on February 1, 2019.

Statistics:

  • Duration of the deviation: approximately 7.5 hours (7:46 am to 3:10 pm on June 13, 2025)
  • Veil height of 2.5 inches across the dam is equivalent to a 200 cfs flow
  • FERC appointed date of approval for deviation: May 27, 2025

Sources:

  • Debbie-Anne Reese, Secretary Federal Energy Regulatory Commission 888 First Street, N.E. Washington, D.C. 20426 Re: Millville Hydroelectric Project (P-2343) License Article 403 Deviation Report for Planned Minor Drawdown for Dam Safety Inspection
  • PE Hydro Generation, LLC; November 20, 2024; Information about planned minor drawdown for annual safety inspection (Accession No. 20241120-5044)
  • FERC; May 27, 2025; Acknowledgment of planned deviation (Accession No. 20250527-3008)

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