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Corporate IESO > Media > About Public Appeals > IESO Extends Power Warning

IESO Extends Power Warning

June 28, 2005

The Independent Electricity System Operator (IESO) is asking consumers to reduce their use of electricity again on Wednesday June 29th as Ontario electricity demand continues to reach near record highs.

Ontario's electricity demand on Tuesday afternoon was just under 26,000 MW, only slightly lower than Monday's all-time record demand for electricity. With conditions expected to be much the same on Wednesday, consumers and businesses are being asked to reduce their electricity consumption, where possible, between the hours of 8:00 a.m. and 8:00 p.m. tomorrow to reduce the strain on Ontario's power system.

Consumers and businesses can reduce the demands on the electricity system by:

* Turning off all but essential internal and external lights;
* Setting air conditioners to 26 degrees Celsius or higher, or using fans as an alternative;
* Closing curtains and blinds to keep out the sun and retain cooler air inside; and 
* Delaying the use of major power-consuming equipment such as dishwashers, washers and dryers and swimming pool pumps until after 8:00 p.m.

"I would like to thank those Ontarians who were able to conserve electricity on Tuesday," said Paul Murphy, Chief Operating Officer for the IESO. "Every little bit helps when we are experiencing this high level of demand and I would encourage a continued, if not greater, effort tomorrow."

Power Warnings are issued by the IESO during periods of high demand for electricity, when supplies of reserve power are low. Any further reduction in transmission or generation availability or any increase in demand could create shortfalls of electricity and require actions such as emergency purchases from other jurisdictions or voltage reduction on the Ontario system.

The IESO is responsible for managing Ontario's bulk electricity system and operating the wholesale electricity market. For more information, visit