Power System Engineer

Date: August 24, 2026

Location: Mississauga, ON – Hybrid/On-site

Requisition ID: 21178

Status: Temporary up to 18 months

Business Unit: Markets and Reliability

Grade/Band: MP4

Shift Work: No

Annual Pay Range: For standard 35-hour work week

Step 1: $111,072 Step 10: $158,704

The successful candidate will be placed at the appropriate step within the salary grade/band, based on relevant years of experience and other applicable considerations.

Why join us?

The IESO is committed to ensuring Ontario’s electricity system meets the province’s needs today and into the future. We are charged with purpose, delivering reliable, affordable, and sustainable electricity for homes, businesses, and communities across the province. We are energized to grow, embracing opportunities to shape the future of a dynamic and evolving energy sector while advancing our careers. We are powered by teamwork, supported by diverse and passionate colleagues who foster respect, celebrate successes, and thrive on shared achievements. At the IESO, it’s not just what we do— it’s who we are

Who We Are

Our central role includes managing the provincial power grid in real-time, overseeing and evolving Ontario’s electricity market, engaging with government, municipalities and Indigenous communities, and planning for Ontario’s future electricity needs. Our employees play a key role in driving grid innovation, protecting the system from threats, advancing the province’s energy conservation programs, and forecasting and procuring the electricity resources we’ll need in the decades to come.

This is a unionized position that falls within the Markets and Reliability business unit.

What Makes This Role Exciting

The energy sector is rapidly evolving, offering exciting new opportunities for those who want to make a difference.

The successful candidate will Conduct engineering studies and analysis to resolve inquiries and support real-time operations.

What You’ll Do

In this role, you’ll make a meaningful impact by contributing to the IESO team and supporting the electricity needs of the province through:

• Conducting studies and analysis in the field of power system operation in areas such as:
  • Operating Security Limits (all time frames);
  • transfer capability;
  • outage (transmission and resource) assessment and support;
  • transmission services;
  • ancillary service requirements;
  • supply adequacy, security and operability;
  • joint operating and/or planning studies;
  • inter-area activities;
  • new or modified power system facilities and connections to the IESO-controlled grid;
  • NERC/NPCC reliability standards compliance and support;
  • executing the Day Ahead commitment process;
  • equipment performance and model validation;
  • developing and managing online and off-line models used by security and market software;
  • validation of the real time operating plan;
  • mentoring and assisting training of new and/or junior staff; or
  • supporting real-time operations use of operating instructions and the accuracy of security software results
• Receive assignment from the Sr Power System Engineer, Engineering Supervisor, Engineering Manager, and/or Senior Manager in general terms on specific problems related to assigned areas of work. Obtain necessary data for problem solution. Develop solutions to problems, information and produce the necessary justification (documentation, study results, etc.) to substantiate recommendations.

Real-time Applications Role

• Perform Ontario Model Build (OMB) activities integrating new and modified elements into the Online model as implementer and/or reviewer
• Perform other tasks related to the OMB process, including but not limited to OMB coordination, display coordination, delivering operating instructions to the control room, preparing bulk files, maintaining the thermal limit monitoring, network security analysis (NSA) and Operations Training Simulator (OTS) and performing Remedial Action Scheme updates/modifications.
• Perform real-time support of RTA supported applications.
• Represent RTA and participate in capital projects as assigned.

Common Role

• Support IESO security, adequacy and operability obligations found in the Market Rules and in applicable NERC and NPCC reliability standards.
• Support the preparation and delivery of reliability compliance evidence, including work procedures, RSAWs, market manuals, training material and participation in reliability audits
• Participate in task forces, as well as internal/external committees on matters related to the secure and economic operation of the IESO-controlled-grid. Represe