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St.Margaret’s Bay Hydro-electricity System, Nova Scotia
The Penstocks which carry the water from the head pond are large pipes of up to 11
feet in diameter.
The Original Penstocks were made from wooden tongue and groove staves held together
with metal bands and sealed on the inside with pitch, the same technology as wooden
barrels in that the water pressure inside the penstock forces the staves against
the meta bands keeping it tight.
Original Wooden Penstock
The St.Margaret’s Bay hydro-electricity system was the first in Canada to use fibreglass
The penstock from Coon Lake was replaced with polypropylene in 2010 although the
penstock is buried its position can be seen here
View towards the Mill Lake hydro-electricity plant
Penstock at the Tidewater hydro-electricity plant, St.Margaret’s Bay