St. George Redevelopment

Project Name: St. George Hydroelectric Project

Summary: Design of new 15 MW facility

Client: J.D. Irving Corporation

Project Location: St. George, New Brunswick, Canada

Project Size: 15 MW

Services Provided:
•  Hydro Powerhouse Preliminary and
Final Engineering Design
•  Turbine Selection and Balance of
Final Design
•  Agency Consultation
•  Bid Specifications and Drawings
•  Preparation
•  Construction Services

Project Timeframe:
2001 - 2004

Relationship with Client: Since 1991

Client Needs:
J.D. Irving (Irving) has commissioned numerous studies over many years for upgrade of an aging 3 MW 1902 vintage facility owned and operated its subsidiary St. George Pulp and Paper and economic conditions allowed Irving to move forward with the project.
Kleinschmidt Solution:
Kleinschmidt worked with Irving to obtain governmental approval, address rock tunnel design conditions, and water-to wire equipment selection that needed to address a nearly 30 foot range of tidal tailwater elevations. Kleinschmidt began final design of the entire new facility with civil/ structural features, two new horizontal Kaplan hydroelectric turbines and all plant mechanical and electrical systems. Other features designed by Kleinschmidt included a new post-tensioned forebay dam and gated spillway, downstream fish sampling and passage system, an intake with a mechanical trashrack raker, and two 11 foot diameter buried steel penstocks. A new 66’W x 84’L reinforced concrete powerhouse set 124’ below grade with the discharge through a 22’ diameter x 425’L bifurcated rock tailrace tunnel complete this project’s challenging civil features. The tunnel construction costs were lowered by implementing a unique reinforced rock plug at the tunnel exit that eliminated costly cofferdamming. Kleinschmidt also provided construction services working with the construction manager.
Client Benefits:
Kleinschmidt’s comprehensive flexible final design allowed Irving to maximize generation with the existing station during construction. Kleinschmidt worked with Irving to design an integrated turbine and station service logic that governs the inter-related gates, alarms, and turbine equipment for switchgear and station controls equipment purchased by Irving from a local supplier which reduced capital costs and facilitates cost-effective maintenance.