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Public Appeals Archive

 

The IESO may issue a public appeal urging consumers to reduce electricity consumption when extreme weather or unexpected generator or transmission outages affect the system's ability to provide for the province's electricity needs.   

  • IESO Extends Public Appeal to Reduce Electricity Use in Toronto

    July 12, 2013

     The Independent Electricity System Operator (IESO) is extending the public appeal to reduce electricity use in Toronto as Hydro One continues to work to restore full service to the major transmission facilities affected by Monday's storm. Conservation efforts can help relieve strain on the system while this work is underway.

    Consumers can reduce the demands on the electricity system by:

    • Turning off all but essential internal and external lights;
    • Setting air conditioners to 26 degrees Celsius or higher, or use fans as an alternative;
    • Closing curtains and blinds to keep out the sun and retain cooler air inside; and
    • Limiting the use of major power-consuming equipment such as dishwashers, washers and dryers and swimming pool pumps.

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

     

  • Continued energy conservation efforts still needed in Toronto

    July 11, 2013

    The Independent Electricity System Operator (IESO) is asking Toronto customers to continue to reduce electricity use where possible.

    While electricity service has been restored to Toronto Hydro, there is a need to reduce consumption while Hydro One works to restore full service to the major transmission facilities affected by Monday's storm.

    With the cooler, less humid conditions today, consumers can reduce demands on the electricity system by avoiding air conditioning or setting the temperature at 26 degrees Celsius or higher. Other ways of reducing demand include:
    - Turning off all but essential internal and external lights;
    - Closing curtains and blinds to keep out the sun and retain cooler air inside; and
    - Limiting the use of major power-consuming equipment such as dishwashers, washers and dryers and swimming pool pumps.

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

  • Need to reduce electricity consumption in Toronto continues

    July 10, 2013

    The Independent Electricity System Operator (IESO) is asking Toronto electricity consumers to reduce their electricity use again today.

    While significant progress has been made in restoring service, supply within parts of the west end of Toronto remains uncertain given the need to reconfigure the system to work around major transmission facilities that remain unavailable.
    The IESO is appealing to Toronto consumers to reduce their electricity use where possible to help relieve the strain on the system.

    Consumers can reduce the demands on the electricity system by:
    - Turning off all but essential internal and external lights;
    - Set air conditioners to 26 degrees Celsius or higher, or use fans as an alternative;
    - Close curtains and blinds to keep out the sun and retain cooler air inside; and
    - Limit the use of major power-consuming equipment such as dishwashers, washers and dryers and swimming pool pumps.

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

  • IESO appeals for reduced electricity consumption in Toronto

    July 09, 2013

    Toronto electricity consumers are being asked to reduce their electricity use today in the wake of yesterday's severe flooding and power outages that hit many parts of the Toronto and surrounding areas just west of the city.

    While more than 90 per cent of electricity service has been restored, supply within parts of Toronto remains uncertain given the need to reconfigure the system to work around those major transmission facilities that normally serve the City of Toronto but are now unavailable due to severe flood damage.

    The Independent Electricity System Operator (IESO) is appealing to Toronto consumers to reduce their electricity use where possible to help relieve the strain on the system.

    "Consumer actions to reduce electricity use will help the IESO, Hydro One and Toronto Hydro manage the situation until major facilities are assessed and returned to service," said Bruce Campbell, President and CEO of the IESO.
    Consumers can reduce the demands on the electricity system by:
    - Turning off all but essential internal and external lights;
    - Set air conditioners to 26 degrees Celsius or higher, or use fans as an alternative;
    - Close curtains and blinds to keep out the sun and retain cooler air inside; and
    - Limit the use of major power-consuming equipment such as dishwashers, washers and dryers and swimming pool pumps.

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

  • IESO Appeals for Reduced Electricity Consumption

    August 02, 2007

    The Independent Electricity System Operator (IESO) is asking consumers to reduce their use of electricity as hot weather puts a strain on Ontario's electricity system.

    "With the current heat wave we expect to see demand reach near record levels today," said Derek Cowbourne, Chief Operating Officer for the IESO. "Overall, Ontario's transmission system and generators are operating well. But as a precautionary measure the IESO is asking consumers to reduce demand to help ensure the continued reliable supply of electricity."

    As a result, consumers and businesses are being asked to reduce their electricity consumption, where possible, from noon until 8:00 p.m. today.

    Consumers and businesses can reduce the demands on the electricity system by:

    - Turning off all but essential internal and external lights;
    - Setting air conditioners to 26 degrees Celsius (78 degrees Fahrenheit) or higher, or using fans as an alternative;
    - Closing curtains and blinds to keep out the sun and retain cooler air inside; and
    - Limiting the use of major power-consuming equipment such as dishwashers, washers and dryers and swimming pool pumps.

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

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  • IESO Appeals for Reduced Electricity Consumption in the GTA

    June 26, 2007

    The Independent Electricity System Operator (IESO) is asking consumers in the Greater Toronto Area (GTA) to reduce their use of electricity during peak demand times over the next two days.

    High temperatures and high humidity levels are resulting in increased demand for electricity through air conditioning use. There are also limitations on the generation and transmission system serving the GTA as a result of equipment outages.

    As a precautionary measure, the IESO is asking customers to reduce demand to help relieve the strain on the system serving the GTA. Curtailment efforts can reduce demand and provide additional operating flexibility to help maintain reliability in the area should further problems develop.

    Residential and business consumers are being asked to reduce their electricity consumption, where possible, between noon and 8:00 p.m. over the next two days.

    Consumers can reduce the demands on the electricity system between noon and 8:00 p.m. by:

    • Turning off all but essential internal and external lights;
    • Set air conditioners to 26 degrees Celsius or higher, or use fans as an alternative;
    • Close curtains and blinds to keep out the sun and retain cooler air inside; and
    • Limit the use of major power-consuming equipment such as dishwashers, washers and dryers and swimming pool pumps.

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

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  • IESO Extends Power Warning

    August 02, 2006

    The Independent Electricity System Operator (IESO) is extending the Power Warning issued yesterday until 8:00 p.m. tonight asking consumers to reduce their use of electricity in order to alleviate the increased strain on Ontario's electricity system.

    "We are looking at very high demand levels again today because of the continued heat and humidity," said Paul Murphy, Chief Operating Officer for the ESO. "Curtailment efforts help relieve the strain on the power system," added Murphy.

    Power Warnings are issued by the IESO during periods of high demand for electricity, when supplies of reserve power are low. Any further reduction in transmission or generation availability or any increase in demand could create shortfalls of electricity. If all sources of supply are exhausted, the IESO will take protective actions such as a system voltage reduction, or rotating power cuts, if necessary. In these circumstances, no additional public notice may be possible.

    Consumers and businesses can reduce demand on the electricity system by curtailing their use of electricity. Examples include:

    -Turning off all but essential internal and external lights;
    -Setting air conditioners to 26 degrees Celsius or higher, or using fans as an alternative;
    -Closing curtains and blinds to keep out the sun and retaining cooler air inside; and
    -Avoiding or limiting the use of major power-consuming equipment such as dishwashers, washers and dryers and swimming pool pumps between the hours of 8:00 a.m. and 8:00 p.m.

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


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  • IESO Declares Power Warning As Hot Weather Strains System

    August 01, 2006

    The Independent Electricity System Operator (IESO) has issued a Power Warning asking consumers to reduce their use of electricity throughout the day in order to alleviate the increased strain on Ontario's electricity system. This Power Warning is in effect until 8:00 pm tonight.

    "The high temperatures and high humidity levels are expected to drive power consumption to record levels today,"said Paul Murphy, Chief Operating Officer for the IESO. "Curtailment efforts result in a reduced load on the system and provide additional operating flexibility when the power system is strained," added Murphy.

    Ontario is expected to set a new peak for electricity consumption today, breaking the current record of 26,160 megawatts (MW) set on July 13, 2005.

    Power Warnings are issued by the IESO during periods of high demand for electricity, when supplies of reserve power are low. Any further reduction in transmission or generation availability or any increase in demand could create shortfalls of electricity. If all sources of supply are exhausted, the IESO will take protective actions such as a system voltage reduction, or rotating power cuts, if necessary. In these circumstances, no additional public notice may be possible.

    Consumers and businesses can reduce demand on the electricity system by curtailing their use of electricity. Examples include:

    -Turning off all but essential internal and external lights;
    -Setting air conditioners to 26 degrees Celsius or higher, or using fans as an alternative;
    -Closing curtains and blinds to keep out the sun and retaining cooler air inside; and
    -Avoiding or limiting the use of major power-consuming equipment such as dishwashers, washers and dryers and swimming pool pumps between the hours of 8:00 a.m. and 8:00 p.m.

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

    - 30 -

  • Voltage Levels Restored in the Greater Toronto Area

    September 12, 2005

    Ontario's Independent Electricity System Operator (IESO) restored voltage levels in an area bounded by Whitby and Oakville, including the Greater Toronto Area (GTA) at 5:15 p.m. EDT.

    The five per cent reduction, which began at 4:10 p.m. EDT, was required due to a transmission line fault in the GTA. This level of voltage reduction should not have been noticeable to most consumers. An investigation into the event is underway.

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

    - 30 -

  • IESO Extends Power Warning

    August 10, 2005

    The Independent Electricity System Operator (IESO) is extending the Power Warning for an additional day, until 8:00 pm tonight.

    With the Power Warning, the IESO is asking customers to reduce their use of electricity today to help mitigate the impacts of the current heat wave on Ontario's power system. High temperature and humidity levels combined with continued limitations on supply are continuing to put a strain on the system.

    As a result, consumers and businesses are being asked to reduce their electricity consumption between the hours of 8:00 a.m. and 8:00 p.m. today.

    Power Warnings are issued by the IESO during periods of high demand for electricity, when supplies of reserve power are low. Any further reduction in transmission or generation availability or any increase in demand could create shortfalls of electricity and require proactive actions such as emergency purchases from other jurisdictions or voltage reduction on the Ontario system.

    Consumers and businesses can reduce the demands on the electricity system by:

    - Turning off all but essential internal and external lights;
    - Setting air conditioners to 26 degrees Celsius or higher, or using fans as an alternative;
    - Closing curtains and blinds to keep out the sun and retain cooler air inside; and
    - Delaying the use of major power-consuming equipment such as dishwashers, washers and dryers and swimming pool pumps until after 8:00 p.m.

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

    - 30 -

  • IESO Issues Power Warning for Tuesday, August 9th

    August 08, 2005

    The Independent Electricity System Operator (IESO) has issued a Power Warning asking consumers to reduce their use of electricity on Tuesday, August 9th as sustained hot weather continues to put a strain on Ontario's electricity system.

    Increasing temperature and humidity levels expected for tomorrow combined with continued limitations on supply, both from domestic generation and imports, are presenting a number of challenges for the IESO in managing the reliability of the electricity system.

    As a result, consumers and businesses are being asked to reduce their electricity consumption between the hours of 8:00 a.m. and 8:00 p.m. tomorrow to reduce the strain on Ontario's power system.

    Power Warnings are issued by the IESO during periods of high demand for electricity, when supplies of reserve power are low. Any further reduction in transmission or generation availability or any increase in demand could create shortfalls of electricity and require proactive actions such as emergency purchases from other jurisdictions or voltage reduction on the Ontario system.

    Consumers and businesses can reduce the demands on the electricity system by:

    - Turning off all but essential internal and external lights;
    - Setting air conditioners to 26 degrees Celsius or higher, or using fans as an alternative;
    - Closing curtains and blinds to keep out the sun and retain cooler air inside; and
    - Delaying the use of major power-consuming equipment such as dishwashers, washers and dryers and swimming pool pumps until after 8:00 p.m.

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

  • IESO Ends Power Warning

    August 05, 2005

    The Independent Electricity System Operator (IESO) has ended the Power Warning as of 8:00 p.m. The IESO earlier restored voltage to normal following a four-hour reduction.

    "We thank those customers who were able to respond to our request to reduce electricity consumption today," said Paul Murphy, Chief Operating Officer for the IESO.

    While the Power Warning ended at 8:00 p.m., the Power Advisory will remain in effect until 6:00 p.m. Friday.

    The IESO issues a Power Advisory when supplies of power, including imports, are forecast to be adequate, but the expected high demand will put a prolonged strain on the electricity system. Conservation measures will benefit consumers, the environment and the electricity infrastructure. Power Advisories can last for an extended period of time.

    Consumers and businesses can reduce the demands on the electricity system by:

    - Turning off all but essential internal and external lights;
    - Setting air conditioners to 26 degrees Celsius or higher, or using fans as an alternative;
    - Closing curtains and blinds to keep out the sun and retaining cooler air inside; and
    - Avoiding or limiting the use of major power-consuming equipment such as dishwashers, washers and dryers and swimming pool pumps between the hours of 8:00 a.m. and 800 p.m.

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

    - 30 -

  • IESO Extends Power Warning

    August 04, 2005

    Ontario's Independent Electricity System Operator (IESO) has extended the Power Warning until 8:00 p.m. tonight. While the voltage was restored to normal levels last night, similar weather and power system conditions are expected today, necessitating the need to extend the Warning.

    As a result consumers and businesses are being asked to reduce their electricity consumption between the hours of 8:00 a.m. and 8:00 p.m. today to reduce the strain on Ontario's power system.

    "A combination of the voltage reduction implemented yesterday and the efforts of those Ontario consumers and businesses who heeded the call to reduce electricity consumption helped to maintain the reliability of the power system," said Paul Murphy, Chief Operating Officer for the IESO. "We appreciate the efforts of customers who did respond to our request and we need additional electricity reduction efforts today."

    Power Warnings are issued by the IESO during periods of high demand for electricity, when supplies of reserve power are low. Any further reduction in transmission or generation availability or any increase in demand could create shortfalls of electricity. If all sources of supply are exhausted, the IESO will take protective actions such as a system voltage reduction, or rotating power cuts, if necessary. In these circumstances, no additional public notice may be possible.

    Consumers and businesses can reduce the demands on the electricity system by:

    - Turning off all but essential internal and external lights;
    - Setting air conditioners to 26 degrees Celsius or higher, or using fans as an alternative;
    - Closing curtains and blinds to keep out the sun and retain cooler air inside; and
    - Delaying the use of major power-consuming equipment such as dishwashers, washers and dryers and swimming pool pumps until after 8:00 p.m.

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


    - 30 -

     

  • IESO Declares Power Warning as Hot Weather Strains System

    August 03, 2005

    Ontario's Independent Electricity System Operator (IESO) has elevated its appeal for reduced electricity use to a Power Warning and is now asking consumers to immediately reduce their use of electricity in order to alleviate the increased strain on Ontario's electricity system.

    "The supply outlook for the rest of today has deteriorated resulting in the need for a Power Warning, a stronger appeal than was issued yesterday morning," said Paul Murphy, Chief Operating Officer for the IESO. "The IESO has implemented a voltage reduction in order to reduce demand and manage the reliability of the power system," added Murphy.

    This Power Warning is in effect until 8:00 p.m. EDT.

    Power Warnings are issued by the IESO during periods of high demand for electricity, when supplies of reserve power are low. Any further reduction in transmission or generation availability or any increase in demand could create shortfalls of electricity. If all sources of supply are exhausted, the IESO will take protective actions such as a system voltage reduction, or rotating power cuts, if necessary. In these circumstances, no additional public notice may be possible.

    Consumers and businesses can reduce the demands on the electricity system by immediately:

    - Turning off all but essential internal and external lights;
    - Setting air conditioners to 26 degrees Celsius or higher, or using fans as an alternative;
    - Closing curtains and blinds to keep out the sun and retain cooler air inside; and
    - Delaying the use of major power-consuming equipment such as dishwashers, washers and dryers and swimming pool pumps until after 8:00 p.m.

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


    - 30 -

     

  • IESO Appeals for Reduced Electricity Consumption as Hot Weather Continues to Strain System

    August 02, 2005

    The Independent Electricity System Operator (IESO) is asking consumers to reduce their use of electricity for the remainder of the week as sustained hot weather continues to put a strain on Ontario's electricity system.

    "The high temperatures and high humidity levels combined with limitations on Ontario's generating capacity are presenting a number of challenges for the IESO in managing the reliability of the electricity system," said Paul Murphy, Chief Operating Officer for the IESO. "Conservation efforts result in a reduced load on the system and provide additional operating flexibility when the power system is strained," added Murphy.

    As a result, consumers and businesses are being asked to reduce the electricity consumption, where possible, between the hours of 8:00 a.m. and 8:00 p.m.

    The voluntary appeal for reduced consumption is in effect until 6:00 p.m. Friday, August 5th. However, more immediate stronger appeals such as a Power Warning or Power Emergency may be issued if the situation deteriorates.

    The IESO issues a Power Advisory when supplies of power, including imports, are forecast to be adequate, but the expected high demand will put a prolonged strain on the electricity system. Conservation measures will benefit consumers, the environment and the electricity infrastructure. Power Advisories can last for an extended period of time.

    Consumers and businesses can reduce the demands on the electricity system by:

    - Turning off all but essential internal and external lights;
    - Setting air conditioners to 26 degrees Celsius or higher, or using fans as an alternative;
    - Closing curtains and blinds to keep out the sun and retaining cooler air inside; and
    - Avoiding or limiting the use of major power-consuming equipment such as dishwashers, washers and dryers and swimming pool pumps between the hours of 8:00 a.m. and 800 p.m.

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

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