Ontario's Water Potential

Hydro Electric Projects

Project Capacity (MW) Status

Chaudière Grinder Sluiceway Generation

0.71

In Service

South River Hydroelectric Project-- South River Power Generation Corporation

0.80

In Service

Eganville Generation Corporation-- Township of Bonnechere Valley

0.84

In Service

High Falls (Bracebridge Generation Ltd.)

1.50

In Service

Almonte Lower Falls Re-Development

4.60

In Service

Glen Miller Hydroelectric Project-- Innergex II Income Fund (Trenton)

8.00

In Service

Trent Rapids Hydroelectric Station-- Trent Rapids Power Corporation

8.00

In Service

Lac Seul-- Ear Falls

13.00

In Service

Island Falls Hydroelectric Project Canadian Hydro Developers Inc. Smooth Rock Falls

20.00

Under Development

Umbata Falls Hydroelectric Project-- a partnership of the Pic River First Nation and Innergex II Income Fund

23.00

In Service

Douglas New GS-- Multistream Power Corporation

81.17

In Service

McLeod Dam (Quinte Conservation)

0.95

Under Development

Total Hydro-electric projects

162.56

 

Source: http://www.mei.gov.on.ca/en/energy/renewable/index.php?page=new-energy-projects

The report Evaluation and Assessment of Ontario’s Waterpower Potential (PDF) states that there is another 5,485 MW in "Practical Projects"

Niagara Falls

The existing plants at Niagara falls are:
Adam Beck I: Capacity: 498 MW
Adam Beck II: Capacity: 1,499 MW

OPG is currently constructing the Niagara Tunnel which will further increase the output from the Sir Adam Beck complex by 14%. (By our estimate this is an additional 280 MW.) It is not clear where this project is included in the list of new projects.
According to http://www.opg.com/power/hydro/niagara_plant_group/ "The plant group's annual production is in the range of 12 billion kilowatt hours, or enough power to supply over one million homes year round."