New York Transmission Company - Energy Highway

2 nd 345 kV Rock Tavern – Ramapo 345 kV Line
Immediately Actionable Project
Project Description:
Central Hudson’s Rock Tavern 345 kV substation will be connected to Con Edison’s Ramapo 345 kV
substation by performing three concurrent system upgrades. The first upgrade would be to convert
O&R’s line 28 (Ramapo 138 kV to Sugarloaf 138 kV) from current operating voltage of 138 kV to 345 kV by
reconnecting line 28 at the Ramapo 345 kV substation. The second upgrade would be to create a
Sugarloaf 345 kV substation and add a 345 / 138 kV step-down transformer between the Sugarloaf 345 kV
and 138 kV substations. The third upgrade would be to install a 345 kV line between Rock Tavern and the
Sugarloaf 345 kV substation utilizing bundled 1590 ACSR (2 x 1590 ACSR). The Project will increase the
import capability into Southeastern New York, including New York City, during normal and emergency
conditions. The Project will be located in Orange and Rockland Counties in New York along the existing
Right of Way (ROW) of the existing Con Edison 345 kV line 77 (Rock Tavern – Ramapo). The transmission
line terminals are located in NYISO Zone G.
Project Size:
The transmission portion of the project will mimic the capability of Con Edison’s existing 345 kV line 77
(Rock Tavern – Ramapo):
1) Length: 27. 4 miles
2) Operating Voltage: 345 kV
3) Thermal Ratings: Summer (3030 Amperes)
The Sugarloaf 345 / 138 kV step down transformer will be a 400 MVA unit.
Terminal Stations and required upgrades:
The terminal stations are:
1) Central Hudson’s Rock Tavern 345 kV substation; where additional substation bay is required
for the proposed 345 kV feeder interconnection.
2) Con Edison’s Ramapo 345 kV substation; where additional substation bay is required for the
proposed 345 kV feeder interconnection.
3) Sugarloaf 345 kV substation needs to be established.
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