The Niagara Tunnel Project is the most recent in a series of additions
to the Complex that began in 1922 with the first generating station,
now called SAB 1. Its water supply came from a canal connected to the
Niagara River.
A second generating station, SAB 2, went on-line in 1954. Its water came from two new 8 kilometre diversion tunnels.
In 1958, a reservoir (Pump GS) was created to supply extra water during periods of high demand.
Between 1996 and 2005, Ontario Power Generation (OPG) completed a major upgrade at SAB 2, increasing its potential generating capacity by 194 megawatts. This extra capacity created the opportunity for the new Niagara Tunnel.
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