Potomac Electric Power Company's 5-Day Manhole Event Report for May 28, 2025 Incident

On May 28, 2025, Potomac Electric Power Company experienced a manhole event at 9th and E Street, SE in Washington, D.C. The incident involved a smoking manhole due to 3-phase secondary mains burning, affecting 121 customers and resulting in a 9-hour and 47-minute outage. This report details the events leading up to and including the incident, as well as the repairs made to restore service.

Key Takeaways:

• The incident occurred on May 28, 2025, at 1506 hours, with reports of a smoking manhole.
• Upon arrival, UG Crews found a displaced solid manhole cover with smoke due to 3-phase secondary mains burning.
• Repairs were completed on May 29, 2025, at 0053 hours, with the primary switching to change out 150E fuses.
• The manhole event affected 121 customers and lasted for 9 hours and 47 minutes.
• The classification of the event was a "smoking manhole" due to a displaced solid manhole cover.
• The incident was reported to the OCC within an hour, and a 5-day manhole event report was submitted to the Commission.
• The report was certified by Dennis P. Jamouneau, Assistant General Counsel of Potomac Electric Power Company, on June 3, 2025.
• The incident was served to all parties in Formal Case No. PEPMIR by electronic mail on June 3, 2025.

Statistics:

• 121 customers were affected by the manhole event.
• The outage lasted for 9 hours and 47 minutes.
• The incident occurred at 9th and E Street, SE in Washington, D.C.
• Repairs began at 1506 on May 28, 2025, and were completed at 0053 on May 29, 2025.

Sources:

• PEPMIR - Manhole Incident Report (June 3, 2025)
• Re: PEPMIR - Manhole Incident Report (sent to Public Service Commission of the District of Columbia on June 3, 2025)