IESO Forecasts Adequate Supply Over the Next 18 Months

TORONTO, Nov. 24, 2011 /CNW/ - Over the next 18 months Ontario will continue to have an adequate supply of electricity to meet consumers' needs, confirms the IESO in its most recent 18-month outlook report. Released today, the report also makes recommendations to ensure the reliability of the electricity system can continue to be maintained in the future.

Ontario's generation resources will increase over the next 18 months with the anticipated return of two refurbished Bruce nuclear units, and the addition of approximately 400 megawatts (MW) of gas-fired generation and more than 800 MW of grid-connected renewable generation. The new transmission line from the Bruce area to Milton is expected to be completed in December 2012 and will deliver additional power to southwestern Ontario where electricity use is concentrated. These expected generation and transmission additions result in a forecast of adequate resources in every week over the outlook period, even under extreme weather conditions.

Continued additions of wind and solar generation will see a combined total of more than 4,300 MW in Ontario by May 2013. Increases in variable generation combined with lower off-peak demand for electricity and the return of two nuclear units may affect the IESO's ability to balance the system in real time when electricity supply exceeds what is being consumed.

"It's important for the IESO to continue to integrate renewable energy into the electricity grid. The ability to manoeuvre all resources, including renewables, is imperative to this integration," says Bruce Campbell, IESO Vice President, Resource Integration. "We need all resources to be flexible so we can keep the grid in balance as consumer demand rises and falls throughout the day and week."

Electricity consumption in 2011 is expected to decline slightly compared to 2010 but is forecast to grow in 2012 by 1.1 per cent. Peak demands are expected to increase slightly.

The IESO regularly assesses the adequacy and reliability of Ontario's power system. The 18-Month Outlook is issued on a quarterly basis and is available at

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

SOURCE Independent Electricity System Operator

For further information:

Alexandra Campbell


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