Eversource Installs New Safety Manhole Covers

New hardware prevents covers from being propelled into the air during underground pressure releases.

Updated on Oct. 27, 2026 in Utilities

Eversource Installs New Safety Manhole Covers

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Since 2024, Eversource Energy has installed approximately 325 energy-release manhole covers across Connecticut to improve public safety. These specialized covers feature a swivel-lock latch that keeps the iron plate attached to the frame while allowing it to lift 4 inches.

Why it matters

The upgrade prevents heavy manhole covers from being launched into the air during pressure buildups caused by equipment malfunctions, moisture, or cable failures. This initiative protects the public from hazardous debris in urban environments.

Eversource currently operates over 6,800 miles of underground electric lines throughout Connecticut. The company plans to replace 8,000 additional manhole covers over the next 10 years to secure this infrastructure.

The players

Eversource Energy

This public utility company operates the electric, natural gas, and water delivery systems for millions of customers across Connecticut, Massachusetts, and New Hampshire.

The details

The swivel-lock mechanism allows the cover to remain tethered to the frame, neutralizing dangerous pressure buildup from environmental or electrical faults. Eversource has deployed this technology in cities including Hartford, Stamford, Norwalk, and Waterbury.

Eversource began installing the new covers in 2024.
The utility plans to replace 8,000 covers over the next 10 years.

Market Landscape

This program reflects a broader industry shift toward prioritizing proactive grid hardening and public safety within aging urban underground infrastructure. It positions Eversource to mitigate long-term liability risks associated with equipment failure in high-density areas.

Residents in cities such as Hartford and Stamford may notice temporary traffic or sidewalk closures during the ongoing replacement of the 8,000 scheduled manhole covers. These upgrades specifically aim to prevent unpredictable safety hazards in areas with high pedestrian and vehicle traffic.

The takeaway

The implementation of swivel-lock covers represents a significant engineering shift in how utilities manage subterranean pressure. Residents should remain aware that utility maintenance in urban centers is a long-term commitment to public safety.