POWER GENERATION

As one of the largest producers of electricity in North America, Ontario Power Generation operates 64 hydroelectric, 5 fossil and 3 nuclear stations producing more than 22,000 megawatts of electricity.

In fact, OPG owns one of the most diversified, low cost and low emission portfolios in North America. Our commitment is to continually improve the efficiency of our generating stations so that Ontario has the power it needs, when it needs it.

In 2007, OPG generated about 70% of the electricity in Ontario or 105.1 terawatt hours (TWh). Our 2007 generation mix consisted of 42% nuclear, 30% hydroelectric and 27% fossil-fuelled electricity.

Nuclear Fleet Generating Capacity: 6,606 MW Stations: 3 2007 Output: 44.2 TWh Currently Generating: 5631 MW

Hydroelectric Fleet Generating Capacity: 6,972 MW Stations: 64 2007 Output: 31.9 TWh Currently Generating: 5036 MW

Fossil-Fuelled Fleet Generating Capacity: 8,577 MW Stations: 5 2007 Output: 29.0 TWh Currently Generating: 3052 MW

Throughout 2007, the availability of our hydroelectric stations remained at consistently high levels, finishing the year at 94 per cent. This level of performance has not been achieved since 1984 when the fleet was much younger.

OPG’s nuclear production benefited from the outstanding performance of the Darlington generating station. The station achieved a capability factor of nearly 90 per cent in 2007. It also received its best ever peer review from the World Association of Nuclear Operators.

And, OPG’s fossil-fuelled stations continued to demonstrate impressive flexibility and responsiveness in 2007 when called upon to meet Ontario’s electricity needs.

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