Hydro Ottawa Limited

Hydro Ottawa Limited

July 15, 2010 08:00 ET

Hydro Ottawa Participates in IESO Voltage Reduction Exercise

OTTAWA, ONTARIO--(Marketwire - July 15, 2010) - Hydro Ottawa Limited, along with other local distribution companies throughout Ontario, is participating in a province-wide voltage reduction test on Thursday, July 15th. This exercise, which is conducted by the Independent Electricity System Operator (IESO), is not expected to have any negative effects on electricity consumers. Brief voltage reductions of this scale are not noticeable to most customers except for the possibility of a slight dimming of the lights.

The voltage reduction test will consist of two exercises:

  • A 3% voltage reduction to take place early on test day, and
  • A 5% voltage reduction to occur about one hour after the completion of the first exercise.

Both tests will be one hour in duration. Tests are subject to postponement and may be rescheduled for Thursday, July 22, 2010 (or a later date) if system conditions are unfavourable.

Voltage reduction is an emergency operating measure that the IESO can employ in order to protect the reliability of the power system or to avoid the need for rotating power outages when the demand for electricity in the province exceeds supply. The IESO performs this test every 18 months to ensure the effectiveness of this measure.

Voltage reduction tests allow the IESO to record the load reduction resulting from a system wide voltage reduction, and to locate potential problems that may occur during emergencies. They are an important part of emergency training for the IESO and market participants, including Hydro Ottawa.

To report any disruption in power during the exercise or at any other time, please call Hydro Ottawa's 24-hour Power Outage line at 613-738-0188.

About the Independent Electricity System Operator (IESO)

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

About Hydro Ottawa

Hydro Ottawa Limited, a wholly owned subsidiary of Hydro Ottawa Holding Inc., is the third largest municipal electricity company in the province. Hydro Ottawa is responsible for the safe, reliable delivery of electricity to more than 296,000 residential and business customers in the city of Ottawa and the village of Casselman.

Contact Information

  • Rosemary Walsh
    Manager, Communications and Public Affairs
    Hydro Ottawa Limited
    Media Pager: 613-221-0063