The objective of this project was to investigate the role played by Canadian electrical utilities in local and regional Ozone production. To pursue the objective, photochemical models, a box model with a two-layer treatment, a reactive plume model (a 1-D model with a horizontal dispersion modification) and a 3-D regional grid model were used. Models to power plants located in various environmental settings across the country were applied. Results from the model simulations are presented. The different behaviours of the power plant plumes in the various environments are discussed. Other important issues related to high Ozone levels in Canada were also investigated.