Given that the Ottawa River is the site of many hydroelectric power stations, climate change effects could cause less power to be generated due to lowering water levels (resulting from increased surface water evaporation or less precipitation). Hydroelectric companies’ licences generally do not limit the amount of water they may take for power production but physical restrictions exist due to their structural limitations. To undertake modifications to dams would require government approval, which may or may not be granted.

Secondary effects on recreational usage and domestic water supply are possible. Less water in southern Ontario is predicted to negatively influence ecosystem integrity and water quality due to a diminished dilution capacity.

Source: Climate Change Impacts on Boundary and Transboundary Water Management. By J.P. Bruce, H. Martin and P. Colucci.(2003)