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Upcoming Solar Eclipse on Monday, April 8

April 4, 2024

A total solar eclipse will pass over southern Ontario on Monday, April 8. Depending on the weather, Ontario’s electricity system could see solar energy output drop by as much as 1,800 MW. The IESO is prepared for the event and has been working closely with weather forecasters to determine the impact the eclipse will have on our solar facilities. There are also several control actions that can be leveraged to ensure reliability, such as increasing the available generation on standby.

In southern Ontario the eclipse will be most visible from Niagara Falls where the event will last from about 2 p.m. to 4:30 p.m. EDT. Totality, or the period of time when the sun is completely blocked, will happen around 3:20 p.m. and last for about three and a half minutes. The impact of the eclipse will be seen as an increase in demand on the IESO’s website as other sources of generation step-in to compensate for a reduction in solar energy output.

The IESO encourages everyone to stay indoors and be safe. You can watch the impact on the electricity system at

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