Ontario Power Generation

OPG News Release, March 24, 2006

March 24, 2006

ONTARIO POWER GENERATION'S DARLINGTON UNIT 3 ENTERS MAINTENANCE OUTAGE AFTER 492 DAYS OF OPERATION

[Clarington]: Ontario Power Generation's Darlington Unit 3 was safely shut down today, beginning an outage that will include inspections and maintenance on a variety of nuclear and non-nuclear systems as part of the station's maintenance cycle.

"Darlington Unit 3 enters this maintenance period after operating for 492 consecutive days," said Gregory Smith, Senior Vice President of the station. "During that time the Unit produced over 10 TWh of electricity; more than enough to have supplied a city about the size of Oshawa for eight years."

Maintenance scheduled during this seven week outage will focus on the continuous improvement of the station's reliability; inspection and maintenance of feeder piping that is part of the Unit's nuclear heat transport system; and inspection and maintenance of the turbine generator.

"Safety, reliability and performance are the focus of our nuclear program and last year's results at Darlington - the best performing multi-unit Candu station in Canada – complemented the solid performance of Unit 3," said Gregory. "As a station, Darlington produced over 17 per cent of all the electricity consumed in Ontario last year."

Darlington units 1, 2, and 4 are all operating at 100 per cent delivering nearly 2,600 MW of electricity to the Ontario electricity grid.

Ontario Power Generation Inc. is an Ontario-based electricity generation company whose principal business is the generation and sale of electricity in Ontario. Our focus is on the efficient production and sale of electricity from our generation assets, while operating in a safe, open and environmentally responsible manner.

For more information contact:
Ontario Power Generation Media Relations
(416) 592-4008 or 1-877-592-4008