Power System Engineer

Date: December 24, 2025

Location: Mississauga

Requisition ID: 20792

Status: Temporary up to 30 months

Business Unit: Markets and Reliability

Grade/Band: MP4

Annual Pay Range: For standard 35-hour work week

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 role is a part of Market Forecasts and Integration team within Markets and Reliability. This is a union job. 

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, analysis and application of specialized technology in the field of power systems in support of real-time operations, operations planning or planning activities. Supply analytical and technical support for policies, operating agreements, equipment specifications, operational and outage plans and system investments.  Conduct model development, studies and analysis that:

• contribute to the production of Operating Instructions (including System Control Orders and on-demand limits);
• support IESO security, adequacy and operability obligations found in the Market Rules and in applicable NERC and NPCC reliability standards;
• assess the impact on reliability and validate performance of new or modified facilities impacting the IESO-controlled-grid;
• develop and update models, data and security applications for existing, new or modified facilities; 
• support online and off-line security model management (models, data, and security applications); and
• support the coordination with neighboring entities on NERC, NPCC and regional market in the area of reliability matters.

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:

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

• Conduct engineering studies and analysis to resolve inquiries and support real-time operations, operations planning or planning functions through analysis and application of highly specialized technology in the field of power system operation in areas including:
• • 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;
  • 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.

Limit Derivation and Outage Integration Role:

• Through technical studies, identify bounds of operations and define critical parameters in the power system for all time frames within the normal scope of coverage. Produce reports to support findings and recommendations.
• Through technical studies, identify power system operating limits and instructions in support of real-time, operations planning and long-term planning using appropriate study criteria within the normal, high-risk and emergency system conditions.
• As required, derive limits and operating instructions within the normal scope of coverage and for forced/planned outages in all time frames, including the provision of TTC/ATC to facilitate the energy markets, capacity/demand response auctions, and transmission rights markets. 
• Issue and oversee the revision, maintenance and accuracy of operating limits to support reliability monitoring and security constrained economic dispatch (market) systems through applicable contingency analysis software and instructions used by off-shift and on-shift staff.
• Support real-time monitoring tools as they related to system and market operations.  
• Complete outage integration reviews and reporting for system security and adequacy with the purpose of accepting or rejecting outage requests from market participants and neighbouring entities.  Coordination between participants, neighbouring entities, or with the IESO maybe be required.

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.  Represent the IESO on interconnection committees. Participate as assigned, as a representative of the IESO before regulatory agencies, etc. and endeavor to advance the interests of the organization in designated areas. 
• Supply a consultative service to other departments and/or business units on matters related to adequacy, security and operability.
• Mentor and assist training of new and/or junior staff
• Exercise limited/periodic supervision over assigned staff on special projects.
•  Sign or sign and seal documents as a P Eng. thus taking professional responsibility for one’s own work.
• On occasion, sign or sign and seal documents as a P Eng. for peer review, or to assume professional engineering responsibility for engineering work performed by unlicensed staff.
• Perform other duties as required.
  
  

In a typical day, you will conduct technical studies to determine operational boundaries and critical parameters for power systems across all time frames, including normal, high-risk, and emergency conditions. It requires establishing and maintaining operating limits and instructions to support real-time operations, planning, and market activities such as energy trading and capacity auctions. Responsibilities include issuing and updating limits for reliability and market systems, supporting real-time monitoring tools, and performing outage integration reviews to ensure system security and adequacy. Coordination with market participants, neighboring entities, and the IESO is essential to manage outages and maintain system reliability.

Role Requirements

Our team consists of experts from diverse backgrounds, each bringing their unique perspectives and skills. 
To succeed in this role, you’ll need: 

• Requires engineering knowledge of electrical theory, power system analysis and control, mathematics, computers science and the like to conduct engineering, economic or analytical studies related to the management and control of the bulk power system.  Requires knowledge of technical writing to prepare effective reports.
• This knowledge is acquired through the completion of an engineering/applied sciences degree from an accredited university or by having the equivalent education.
• Requires a licence to engage in the practice professional engineering in Ontario and be competent in the field of electrical engineering

• Requires lengthy exposure to the overall power system operation through progressive training in an appropriate technical field.  Requires specific experience as applicable to the particular specialty of the group.

Experience will be related to the fields of:

• utilization of generation resources
• secure operation of bulk power system
• reliability

Background experience will include:

• electrical engineering design concepts as they relate to the functions and characteristics of power system components
• analytical studies and the application of computer techniques to solve power system problems
• familiarity with power system operation, practices, and policies
• familiarity with electric energy  and transmission rights market operations, practices, policies, and Market Rules
• competitive market operations
• provincial operating and system requirements
• particulars of power system operation, including technical features of equipment and facilities, high-tension transmission, system interconnection and methods of attaining efficiency in power production and interchange between systems

A period of over 6 years, up to and including 8 years is considered necessary to gain this experience.

How We Support You

From a comprehensive total rewards program to dynamic learning and development opportunities—including job rotations to broaden your expertise—we empower you to define and shape your own success. When you join the IESO, here’s what you can expect:

• Best-in-class benefits and long-term support in the form of a defined benefit pension plan. 
• Work in a dynamic and evolving sector that offers exciting opportunities and the chance to explore new career paths.
• Leadership that values meaningful discussions, welcomes feedback, and prioritizes career development. 
• A strong, inclusive culture and a collaborative team environment with a shared passion for impactful work.
• Compensation packages that are regularly reviewed to remain competitive and to best accommodate the diverse needs of our employees. 

Deadline

January 16, 2026. For future reference, please save a copy of the job posting as it will no longer be available once the posting closes.

Thank you for your interest in a career at the IESO. Only candidates selected for an interview will be contacted. Please note that the successful candidate must be legally eligible to work in Canada and will be subject to applicable background checks. 

IESO will not conduct interviews or offer positions via online, text, chat or social media platforms. We will not gather personal information directly from candidates or potential candidates. Selected candidates will work with our Talent Acquisition team to ensure their application is processed.

The IESO will be transitioning to a 3-day in-office work week effective January 2026. Over the course of 2026, the IESO will advance plans to acquire additional office space to accommodate more in-office time. While the timeline for moving to a full 5-day in-office model has not yet been established, we are committed to keeping employees and candidates informed as plans progress and give them as much advance notice as possible to prepare for any changes.

We believe in opportunities for everyone. 

At the IESO, we know that achieving great results depends on embracing diversity by attracting, developing, and retaining people from a wide variety of backgrounds. We do this by ensuring our recruitment and advancement policies are fair and equitable, and by creating an accessible and inclusive environment—one that values every team member’s unique skills and experiences and ensures they have the support they need to achieve their potential. If you require accommodation during the recruitment process, please let us know. We’re proud to say we’ve been recognized as a supportive, inclusive employer. 

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