Adam Beck II contains 16 generators and first produced power in 1954.
The water was first diverted from the Niagara River by two five-mile tunnels under the city of Niagara Falls, Ontario, that start above the falls.
A reservoir was created that permits the holding of water, diverted during the night, for use during the day.

Between 2006 and 2013, Adam Beck II underwent major civil engineering projects with the addition of a major underground water supply tunnel built by the Niagara Tunnel Project in order to improve its generation output.
Water delivered by the major new tunnel complemented other upgrades to the Sir Adam Beck generating complex, resulting in a significant increase to the efficient use of the Niagara River's hydro power.

The project's new 12.7-metre (42 ft) diameter, 10.2 km (6.3 mi) long tunnel was officially placed into service on 21 March 2013, helping to increase the generating complex's nameplate capacity by 150 MW, able to provide the power for about 160,000 homes.
A CAD 60 million refurbishment was started in 2016.

The major 1965 Northeast Blackout of Ontario and several U.S. states occurred on 9 November, after maintenance personnel incorrectly set a protective relay on one of the transmission lines from the Sir Adam Beck Station No.
II.
The faulty relay later tripped open causing a major blackout created by a series of cascading failures which affected over 30 million people for up to 12 hours.
Adam Beck II contains 16 generators and first produced power in 1954. The water was first diverted from the Niagara River by two five-mile tunnels under the city of Niagara Falls, Ontario, that start above the falls. A reservoir was created that permits the holding of water, diverted during the night, for use during the day.
Between 2006 and 2013, Adam Beck II underwent major civil engineering projects with the addition of a major underground water supply tunnel built by the Niagara Tunnel Project in order to improve its generation output. Water delivered by the major new tunnel complemented other upgrades to the Sir Adam Beck generating complex, resulting in a significant increase to the efficient use of the Niagara River's hydro power.
The project's new 12.7-metre (42 ft) diameter, 10.2 km (6.3 mi) long tunnel was officially placed into service on 21 March 2013, helping to increase the generating complex's nameplate capacity by 150 MW, able to provide the power for about 160,000 homes. A CAD 60 million refurbishment was started in 2016.
The major 1965 Northeast Blackout of Ontario and several U.S. states occurred on 9 November, after maintenance personnel incorrectly set a protective relay on one of the transmission lines from the Sir Adam Beck Station No. II. The faulty relay later tripped open causing a major blackout created by a series of cascading failures which affected over 30 million people for up to 12 hours.
Sir Adam Beck Hydroelectric Generating Stations