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DEP Seeks Public Input on Transmission Line Rebuild to Three Mile Island Nuclear Data Center
The project will rebuild 500 kV transmission lines crossing the Susquehanna River to the power plant in Dauphin County.
Apr. 17, 2026 at 8:06pm
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An abstract visualization of the complex electrical grid infrastructure serving the Three Mile Island nuclear data center, highlighting the need for ongoing maintenance and upgrades to ensure reliable regional power.Harrisburg TodayThe Pennsylvania Department of Environmental Protection has published a notice inviting public comments on a Chapter 105 water encroachment permit for a project by Mid-Atlantic Interstate Transmission, LLC to rebuild 500 kV transmission lines crossing the Susquehanna River and connecting to the substation at the Three Mile Island Nuclear Data Center Power Plant in Londonderry Township, Dauphin County.
Why it matters
The project will impact a small amount of wetlands, though no mitigation is required due to the minimal area affected. Public input is being sought as part of the permitting process for this critical infrastructure upgrade connecting the nuclear power plant to the regional electricity grid.
The details
The project will place 0.02 acres of fill in wetlands, but DEP has determined that no mitigation is required due to the de minimis area impacted. DEP is accepting public comments on the permit application until May 18, 2026.
- The notice was published in the April 18, 2026 edition of the Pennsylvania Bulletin.
- The public comment period will be open until May 18, 2026.
The players
Mid-Atlantic Interstate Transmission, LLC
The company proposing the project to rebuild the transmission lines connecting to the Three Mile Island Nuclear Data Center Power Plant.
Pennsylvania Department of Environmental Protection
The state agency overseeing the permitting process and accepting public comments on the project.
Three Mile Island Nuclear Data Center Power Plant
The nuclear power plant that the transmission line rebuild project will connect to in Londonderry Township, Dauphin County.
What’s next
DEP will review all public comments received by the May 18 deadline before deciding whether to issue the water encroachment permit for the project.
The takeaway
This transmission line rebuild project is a necessary infrastructure upgrade to ensure reliable power delivery to the Three Mile Island nuclear data center, though the public input process allows residents to voice any concerns about the minimal wetland impacts.
