St. Margaret's Bay Hydroelectric System

St. Margaret's Bay Hydroelectric System
St. Margaret's Bay Hydroelectric System
	Mill Lake Hydro Plant
	Location of second of two power stations St. Margaret's Bay Hydroelectric System (Canada)
Country	Canada
Location	Halifax Regional Municipality, Nova Scotia
Coordinates	44°41′29″N 63°53′30″W / 44.69145°N 63.8917°W
Purpose	Power
Status	Operational
Construction began	May 1920
Construction cost	$1,700,000
Built by	D.G. Loomis & Sons
Designed by	C.H. & P.H. Mitchell, of Toronto
Owner(s)	Emera
Operator(s)	Nova Scotia Power
Upper reservoir
Creates	Mill Lake & Sandy Lake
Total capacity	101,145,000 m3 (82,000 acre⋅ft)
Active capacity	89,180,700 m3 (72,300 acre⋅ft)
Catchment area	271 square kilometres (105 sq mi)
Normal elevation	Mill Lake 77.4 m (253.9 ft), Sandy Lake 66 m (216.5 ft)
Lower reservoir
Creates	Mill Lake Head Pond
Normal elevation	27.9 m (91.5 ft)
Mill Lake, Sandy Lake & Tidewater Plants
Coordinates	44°41′29″N 63°53′29″E / 44.691384°N 63.891380°E
Commission date	8 June 1922
Type	Conventional
Hydraulic head	Mill Lake 50 m (164.04 ft), Sandy Lake 38 m (124.67 ft), Tidewater 27.9 m (91.54 ft)
Turbines	2 x 6 MW + 2 x 2.9 MW
Installed capacity	10.2 MW
Annual generation	30 GWh
	Website; www.nspower.ca

The St. Margaret's Bay Hydroelectric System consists of three hydroelectric power plants (two collocated in the same building) and the related lake, dam, and river systems driving them. The system is situated within both Lunenburg County and the Halifax Regional Municipality, beginning approximately 2.5 km (1.6 mi) east of the Head of Saint Margarets Bay and approximately 10 km (6.2 mi) southwest of Hammonds Plains. The system is part of the East Indian River watershed and drains 271 square kilometres (105 sq mi), with water storage provided in Lunenburg County by Mill Lake, Coon Pond, Sandy Lake, Wrights Lake, Big Indian Lake, Five Mile Lake and, at times, an overflow from Pockwock Lake in the Halifax Regional Municipality. The system is owned and operated by Nova Scotia Power Inc.

System assets associated with the St. Margaret's Bay Hydro System, which represents six generating units with an operating capacity of 10.2 MW, include Beeswanger Dam, Five Mile Dam and Wing Dam 4, Mack Lake Main Dam, Five Mile Wing Dams 1,2 and 3, Big Indian Dam, Wright's Lake Dam, Coon Pond Dam, Sandy Lake Dam, Sandy Lake and Coon Pond Pipeline, Mill Lake Plant and Surge Tank, Little Indian Crossover, Mill Lake Dam, Tidewater Plant and Surge Tank, Tidewater Pipeline, as well as associated headponds. Outflow is into St. Margarets Bay, Nova Scotia between Head of St. Margarets Bay and Tantallon.

Commissioned 8 June 1922, St. Margaret's Bay Hydroelectric System is the oldest hydro plant in Nova Scotia.

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