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Planned Voltage Reduction Test -

July 23, 2026

The Independent Electricity System Operator (IESO) will be conducting a planned province-wide Voltage Reduction Test on Thursday, July 23, 2026. As Ontario's electricity system operator, the IESO conducts these routine tests approximately every 18 months to help verify emergency operating procedures and support the ongoing reliability of the provincial electricity grid.

What You Need to Know

Date: Thursday, July 23, 2026

Test Times (Eastern Time):

  • 9:00 a.m. - 10:00 a.m. (approximately 3% voltage reduction)
  • 1:00 p.m. - 2:00 p.m. (approximately 5% voltage reduction)

Expected Impact: Most customers will notice little or no difference.

Power outages are not expected as part of this planned test. You can continue using electricity as you normally would during the scheduled testing.

Customers with larger sensitive equipment are encouraged to monitor their facilities during the scheduled test periods and report any electrical issues after testing to InnPower Customer Service.

What You May Notice

During the scheduled testing period, some customers may experience:

  • Slight dimming of lights
  • Minor changes in the performance of some electrical equipment
  • Temporary fluctuations in voltage

These changes are expected to be minimal, and voltages will remain within established industry standards.

Why Are These Tests Conducted?

Routine voltage reduction tests help:

  • Verify emergency operating procedures
  • Confirm equipment performs as expected 
  • Identify potential issues before an emergency occurs
  • Support the reliability and resilience of Ontario's electricity system

Learn More

To learn more about voltage reduction testing and why it is conducted, visit the IESO's webpage:

Voltage Reductions - Independent Electricity System Operator (IESO)

July 8th, 2026
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DISCLAIMER:

This hosting capacity map is provided for informational purposes only. It is not intended to be, and should not be relied upon as, a basis for determining the permissible capacity of distributed energy resources (DERs) that may be interconnected to the distribution system. Separate and specific analysis is required to determine DER capacity on the distribution system. Further, the information, data and materials are provided on an “as is” basis and while InnPower Corporation provides this information in good faith, INNPOWER CORPORATION does not warrant, covenant or guarantee, in an expressed or implied form, arising by law or otherwise, the completeness, effectiveness, accuracy and/or fitness or the information for any particular use. INNPOWER CORPORATION does not assume responsibility nor accept any liability arising from any use of the information. This information is proprietary and may not be reproduced without consent from INNPOWER CORPORATION.

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