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IESO to Conduct Routine Voltage Reduction Test on February 1

December 23, 2021

A routine voltage reduction test will take place on Tuesday, February 1, 2022, as part of mandatory testing of the IESO’s emergency operating measures. The test is an important tool for ensuring the reliability of Ontario's electricity grid.

Voltage reductions lower demand quickly and minimize the likelihood of service interruptions, helping the IESO maintain the reliability of Ontario’s power system during a variety of unplanned occurrences.

A three per cent reduction is expected to occur from 9 a.m. to 10 a.m. EST. A five per cent reduction is planned for 1 p.m. to 2 p.m. EST. These tests are normally conducted every 18 months.

Voltage reduction tests have three key purposes:

- To determine how much power can be reduced through the two levels of reduction

- To identify equipment problems so they can be addressed

- To help keep IESO and market participant staff familiar with procedures to execute voltage reductions and identify any deficiencies in the procedures that may need correction

More information about voltage reductions is available on the IESO website. A formal notification letter will be sent out to market participants involved early January.

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