ZGlobal Performs Economic Studies for New San Marcos - Escondido Transmission Line

April 25, 2018

ZGlobal was retained by the Environmental Science Associates to perform alternatives and cost benefits analysis on a proposed San Diego Gas and Electric Company (SDG&E) project. SDG&E proposes to construct, reconductor, and operate a new, approximately 12-mile-long 69-kilovolt (kV) overhead electric power line between the existing SDG&E Escondido Substation and San Marcos Substation to support existing and future area load and prevent potentially long outages or disruptions of service to existing and new customers in the local communities and the surrounding area.


The proposed project is intended to meet the following objectives: 1) eliminate existing congestion in the Escondido/San Marcos area, 2) eliminate the North American Electric Reliability Corporation (NERC) Category P0 (Cat A) and Category P1 (Cat B) violation on Tie-Line (TL) 680C (San Marcos–Melrose Tap), and 3) improve reliability by providing an additional feed to San Marcos substation.

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