IESO Plans Routine Voltage Reduction Test

TORONTO, July 14 /CNW/ - The Independent Electricity System Operator (IESO) is planning a routine voltage reduction test for tomorrow, Thursday, July 15, 2010. The IESO performs voltage reduction tests every 18 months to simulate emergency actions and measure the load reduction that occurs.

The IESO is working closely with transmitters and local distribution companies to prepare for the voltage reduction test, which will consist of two separate exercises. A three per cent reduction in voltage will take place from 9:00 a.m. to 10:00 a.m. EST, while a five per cent reduction will take place from 1:00 p.m. to 2:00 p.m. EST.

"We have many ways of balancing electricity supply and demand," said Ken Kozlik, Chief Operating Officer of the IESO. "When times are tight, a voltage reduction can reduce the demand for electricity and give us important flexibility that could allow us to avoid interruptions to end-use consumers. We are required to test it from time to time to confirm how much relief could be available in an emergency."

Consumers will not notice voltage reductions as supplied voltages are still expected to be within established industry standards for electrical equipment. Consumers with questions about the test should contact their local distribution company. A list of local distribution companies is available at www.ieso.ca/findutility.

More information about voltage reductions is available on the IESO website at www.ieso.ca/voltagereduction or by contacting customer relations at 1-888-448-7777.

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

SOURCE Independent Electricity System Operator

For further information: For further information: Alexandra Campbell, 416-506-2806


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