Broadrock Renewables •  Johnston, RI
115kV High Voltage Switchyard & Tieline Project
Project Partner: R.G. Vanderweil Engineers, LLP | Boston, MA

PIDC provided a full complement of construction/project management services for Broadrock’s combined cycle landfill-gas-to-energy (LFGTE) plant. The project included the construction, commissioning, test and turnover of a new 115kV electrical switchyard and transmission line — along with the coordination of final engineering documents and the securement of local permits.

The LFGTE plant was expanded to a total output of 32 MW, requiring a new 115kV electrical interconnect to transmission line between the Drumrock and Hartford Avenue substations owned by New England Power Company, a division of National Grid.

Through effective planning and procurement — including numerous long-lead purchases — PIDC delivered the $9M project under budget. We also met the backfeed available milestone for the expanded plant, which was inspected, tested and accepted by National Grid.

Project highlights include:


  • Arrangement of three 115 kV, 3000 A, 50 kA non-IPT circuit breakers in a ring bus
  • Installation of a disconnect switch on the GSU transformer for the expanded LFGTE plant, which serves as the demarcation point between the switchyard and National Grid.
  • Extensive deep caissons, equipment support structures and relay house

Transmission Line Loop

  • New 2,200-foot 115 kV looped transmission line from the existing National Grid right-of-way to the new interconnecting switchyard
  • Modifications to the line structures, in addition to raising one structure on the adjacent 345kV line.

Founded in 2010, Broadrock Renewables LLC produces clean energy solutions across a wide range of renewable-energy and additional technologies. A portfolio company of MIP II, Broadrock’s senior management team has decades of experience in diverse aspects of the energy industry. Its current portfolio of development projects includes landfill-gas fueled facilities for electrical generation in California and Rhode Island.

Owner Contact:
Reference available upon request.