EarthWorks Geospatial Catalog

North America (Transmission Line Constraints, Dec. 2008)

The Platts Transmission Line Constraints geospatial data layer contains lines representing transmission line corridors in the United States that have historically experienced capacity constraints. When electricity transfer on a transmission line into a market reaches its limit the transmission line is said to be constrained. Transmission line constraints can signify an area of security concern, a need to better balance electricity flow into a market, or the need for additional transmission lines to serve a market. In the Eastern United States these constraints are termed "flowgates" by the North American Electric Reliability Council (NERC) and in the Western United States these constraints are termed "paths" by the Western Electric Coordinating Council (WECC).
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