Burns & McDonnell is providing design and construction services for a double circuit 345-kV tubular steel line that will replace an existing double circuit 138-kV lattice tower line between the existing PSE&G Sewaren and Metuchen substations. Burns & McDonnell will also design a double circuit 345/230-kV tubular steel line that will replace a double circuit 138-kV lattice tower and a single circuit 230-kV lattice tower line between the existing PSE&G Metuchen and Edison substations.
These system upgrades are part of a general rebuild at the Sewaren substation after Hurricane Sandy. It will increase the operating voltage from 138-kV to 230-kV, reflecting both damage and general equipment age. The upgrades are also part of a transmission line overload that is projected after generation retirements in 2015. Although these lines are being designed to build a 345-kV backbone, they will not be operated at that voltage until a later date.
Existing right-of-way is being used for these proposed lines and existing PSE&G structures must be removed from the right-of-way to make space for this project. Additionally, these corridors were developed to allow high-pressure gas transmission and oil pipelines. These pipelines add complexity in designing a safe and reliable replacement transmission facility.
The corridors associated with this project are a representative example of maximizing available existing ROW space for a client in line with other existing infrastructure.