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Overhead vs Underground Cost Study

Study to Develop Order of Magnitude Cost for 345kV & 138kV Transmission Build for the State of New York
Project Scope: The Client, as part of its economic planning process, was to perform studies to identify congested elements for which generic solutions are proposed. The generic solutions are classified as demand resources, generation, and transmission line based, and part of the 2009 Congestion Analysis and Resource Integration Study (CARIS) potential generic solution set. The client requested Quanta Technology (QT) and Realtime Utility Engineers (RUE) to develop cost estimates for 345kV transmission lines and interconnecting substations.

 

Two basic substation types were considered: Air Insulated Substations (AIS) and Gas Insulated Substations (GIS). In all cases, only the switchyards were included and transformers were not included in the substation scope.

 

T-1 Upstate NY 345kV Overhead Transmission Line, (3) miles in length, PPP (paper/polypropylene/paper)-insulated cable, HPFF (High Pressure Fluid Filled) pipe cooled, urban area, (5) manholes per mile, $357/hr labor and equipment costs.

 

T-2 Downstate NY 345kV Underground Transmission Line, (3) miles in length, PPP (paper/polypropylene/paper)-insulated cable, HPFF (High Pressure Fluid Filled) pipe cooled, urban area, (5) manholes per mile, $357/hr labor and equipment costs.

 

T-3 Long Island 138kV Underground Transmission Line, (3) miles in length, PPP (paper/polypropylene/paper)-insulated cable, HPFF (High Pressure Fluid Filled) pipe cooled, urban area, (5) manholes per mile, $357/hr labor and equipment costs.

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