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NEWS RELEASE

IESO Releases Results from Earth Hour

March 28, 2009

The Independent Electricity System Operator (IESO) tonight reported that Ontario demand was reduced by more than six per cent or 920 megawatts (MW) as a result of Earth Hour.

Ontarians - all across the province - answered the call to action and reduced their electricity use," said Paul Murphy, IESO President and CEO. "The savings were equivalent to what would normally be produced from two coal-fired units in the province."

"Earth Hour reminds us of the importance of using electricity wisely and conserving all year round to benefit the power system and combat climate change," said Murphy.

The IESO is responsible for managing Ontario's bulk electricity power system and operating the wholesale market, every hour, every day. For more information, please visit www.ieso.ca.

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IESO Media Desk:
416-506-2823 or media@ieso.ca

PUBLIC APPEALS

In periods of tight electricity supplies, the IESO may issue a public appeal urging consumers to reduce electricity consumption. Typically, public appeals are issued when extreme weather or unexpected generator outages stretch the system's ability to provide enough electricity to meet demand and required levels of reserve.
• Full list of public appeals since May 1, 2002.