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Bridgewater Substation Upgrade

Project Highlights:
  • No interruption to the powergrid
  • No lost time accidents 40,000 hours
  • Integration of emergency repairs without interruption of contract work
  • Coordination of men and equipment involving National Grid, subcontractors and outside contractors


J.F. White was contracted by National Grid to provide Primary and Secondary upgrades to the Substation.

Primary upgrades include; replacement of 5 existing 115KV breakers, installing 2 new 115KV breakers, into a new 115KV bay, replacing multiple CCVT’s and 115KV disconnect switches, replacement of 2 existing 345KV breakers, and associated 345KV disconnect switches. In addition, existing E1/115KV transmission line was relocated to the new 115KV bay, which required 5 new transmission structures on steel reinforced concrete foundations, related transmission re-conductoring, and removal of 2 existing structures with their related conductors.

Secondary upgrades include; Replacing all control cabling in the Bridgewater substation to meet bulk power supply standards including new control / protection systems, and a new 345/115KV BPS control house.

No interruption to the power grid during the transition to the new equipment.

Contract value: $10,750,000