Project Detail

Pejepscot Hydroelectric

Topsham, ME

Scope of Work

Construction of a low head hydro power facility at an existing paper mill. The new 15 MW facility required extensive controlled demolition; rehabilitation of the timber crib dam; concrete and cofferdams.

Lean, Innovative, and Unique Project Solutions

Cianbro planned around the construction around the needs of the mill. Due to limited access, a tower crane was used to service the construction.

Project Details

  • Demolished portions of the mill including piping relocations to maintain on going mill operations
  • Installed five 40-foot diameter, 50-foot high cellular sheet pile cofferdams designed for 40 feet of head for the main portion of the cofferdam; deep rock bolts for reinforcing an existing masonry headwall
  • Controlled ledge excavation for the powerhouse and tailrace with a combined volume of 20,000 cubic yards
  • Installed 30,000 cubic yards of reinforced concrete for the structures including the powerhouse, retaining walls, rehabilitation of the dam, and the fish ladder
  • Installed mechanical, electrical and control systems for the 15 MW Allis-Chalmers vertical Kaplan unit
  • Rehabilitated three existing horizontal turbine generators to supplement the one large new vertical Kaplan unit