Backer profile · Power company
Mid-Atlantic Interstate Transmission, LLC
Mid-Atlantic Interstate Transmission, LLC is FirstEnergy's high-voltage transmission company in Pennsylvania, with 4,281 circuit miles of lines in the state, according to FirstEnergy's 2025 annual report. It's a wholly owned subsidiary of FirstEnergy Transmission, LLC, which FirstEnergy owns 50.1 percent of and Brookfield 49.9 percent, and it has no employees of its own. Our records tie it to FirstEnergy's pledge to spend $15 billion on its Pennsylvania grid, which serves 56 of the state's 67 counties and is partly driven by data center growth.
Its parent, FirstEnergy Transmission, is a member of Valley Link, which PJM awarded two transmission projects in February 2025 estimated at about $3 billion, with FirstEnergy Transmission's share about $1 billion.
Scoreboard
1
Pennsylvania project on our map
Developer: 1 · Owner: 1
Projects
| Project | Status | Role | Size named |
|---|---|---|---|
| FirstEnergy $15 Billion Pennsylvania Grid Expansion56 of 67 Pennsylvania countiesSuggest a correction | Under Construction | Developer, Owner | · |
Sources
- FirstEnergy Corp. Form 10-K for the year ended December 31, 2025 U.S. Securities and Exchange Commission (EDGAR) · 2026-02-18
- FirstEnergy $15 Billion Pennsylvania Grid Expansion No Conshy Data Centers · 2026-10-22
Project details, statuses and figures come from each project’s own profile, which lists its sources.
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