Ontario Power Generation

OPG News Release, June 27, 2006

June 27, 2006

ONTARIO POWER GENERATION'S DARLINGTON UNIT 3 ENTERS SHORT TERM MAINTENANCE OUTAGE

[Clarington]: Ontario Power Generation's Darlington Unit 3 was safely shut down yesterday evening for a short maintenance outage. During this short outage, inspection and maintenance work will be performed on the nuclear and turbine systems.

Darlington Units 1, 2 and 4 are operating at full power.

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