Date: Monday June 29, 2026
Location: Mississauga, ON – Hybrid
Requisition ID: 21145
Status: Regular
Business Unit: Markets and Reliability
Grade/Band: MP4
Shift Work: No
Annual Pay Range: For standard 35-hour work week
Step 1: $111,072 to 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 Connection Assessments team 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 posses a professional engineering license from Ontario and have extensive experience working with power systems. The Power System Engineer conducts 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:
- The power system engineer conducts 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.
Assess Power System Change Role:
- Undertake System Impact, Technical Feasibility and de-registration assessments to evaluate the reliability and operability impact of a new or modified connection, or a disconnection, on the integrated power system using applicable IESO, NERC and NPCC reliability standards.
- Prepare reports containing the results of the study, any required system upgrades and connection requirements, and a recommendation for the IESO to issue a notice of approval or disapproval for the new or modified connection.
- Validate registration data based on information initially submitted for assessment. Re-assess the proposed connection if the registration data differs materially from the configuration or technical parameters that were used by the IESO to approve the new or modified facility.
- Provide support for regional and bulk power system planning, for preparation of evidence required by connection applicants to obtain the OEB’s leave to construct and for inquiries from neighboring jurisdiction as they relate to connection assessments.
- Conduct technical studies to support the IESO's initiatives for evolving the policies related to the operations and evolution of the IESO-controlled grid and the IESO-administered markets.
Support SPS/RAS classification processes on behalf of the IESO with external standards authorities.
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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.
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In a typical day, you will conduct detailed system impact, technical feasibility, and de-registration assessments to determine how new, modified, or retiring connections will affect the reliability and operability of the integrated power system in alignment with IESO, NERC, and NPCC standards. This includes analyzing technical data, validating registration details, and re-assessing projects when configurations or parameters change. Time is also spent preparing comprehensive reports outlining study results, required system upgrades, and formal recommendations on whether connections should be approved or denied. Additionally, the role supports broader system planning initiatives, responds to stakeholder and regulatory inquiries, and performs technical studies that inform the evolution of grid operations and market policies.
Currently, the Connection Assessments team is helping shape the future of Ontario’s electricity grid by facilitating the integration of innovative and high-impact projects, including data centres, battery energy storage systems (BESS), and Small Modular Reactors (SMRs). These projects play an essential role in supporting growing electricity demand, enhancing system reliability, and advancing decarbonization objectives.
Additionally, as the first team to assess many emerging technologies seeking to connect to the grid, Connection Assessments operates at the forefront of industry innovation. The diverse nature of these projects presents unique technical, operational, and regulatory challenges that foster continuous learning, professional development, and opportunities to influence the evolution of Ontario’s energy landscape while delivering customer-focused solutions.
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.
This is a promotion-in-place (PiP) role. Those with lesser qualifications will be considered as a Power System Engineering Analyst.
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
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 currently has a 3-day in-office work week for applicable roles. 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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