Senior Engineering Technologist

Date: January 15 2026

Location: Mississauga ON

Requisition ID: 20739

Status:Temporary

Business Unit:Markets and Reliability

Grade/Band: 64

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 Ontarios electricity system meets the provinces 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 its not just what we doits who we are!

Who we are

Our central role includes managing the provincial power grid in real-time overseeing and evolving Ontarios electricity market engaging with government municipalities and Indigenous communities and planning for Ontarios future electricity needs. Our employees play a key role in driving grid innovation protecting the system from threats advancing the provinces energy conservation programs and forecasting and procuring the electricity resources well need in the decades to come.
This role is a part of Market & Reliability business unit under Power System Limits department. The team is responsible for establishing reviewing and communicating grid operating limits instructions and associated monitoring that are used to direct the operation of a secure grid and efficient market.

What makes this role exciting

The energy sector is rapidly evolving offering exciting new opportunities for those who want to make a difference. Working at the centre of the provinces power system you will be ensuring Ontarians have access to reliable and cost-effective electricity when and where they need it by supporting reliable integration of new facilities into the system.

What youll do

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

• Analyze statistical mathematical and engineering data to support studies related to power system operation reliability and planning.
• Prepare organize and present technical data in graphic tabular and report formats to enable engineering conclusions.
• Develop modify test and debug computer programs for EMS securitylimit monitoring including documentation and production implementation.
• Maintain and troubleshoot existing engineering software and databases by identifying issues coordinating corrective actions and updating procedures.
• Perform shortcircuit and loadflow studies using commercial power system analysis tools including basecase development and results documentation.
• Design and produce single-line diagrams and other CAD-based drawings to support system studies and operational needs.
• Manage and update technical databases in line with changes in the IESO-controlled grid to support system operations EMS applications outage coordination and system configuration tracking.
• Provide periodic supervision to assigned staff and collaborate with internal users to define requirements validate data and deliver study results.

In a typical day you will be assisting operation teams implement adequate system monitoring to facilitate reliable operation of the IESO-controlled grid reviewing upcoming changes in the power system to help prepare operating instructions and incorporating recent system changes into baseline models for offline studies.

Recently this position was part of reliable integration of battery energy storage systems in Ontario by providing additional system monitoring required for reliable operation of these assets.

Role Requirements

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

• Requires knowledge of power system networks control and feedback systems electrical and electronic theories advanced mathematics and engineering principles to analyze statistical mathematical and engineering data in assisting professional staff to carry out studies relative to power system operation and reliability.
• Requires knowledge of computer techniques to write and modify programs and utilize computer facilities.
• Requires knowledge of technical writing for the preparation of clear concise reports.
• This knowledge is considered to be normally acquired either through the successful completion of Grade 12 in a Secondary School Commercial or Technical School plus a three-year course of concentrated study in the appropriate subjects obtained in the Province of Ontario from a College of Applied Arts and Technology Polytechnical Institute or Community College or by having the equivalent level of education.

How We Support You

From a comprehensive total rewards program to dynamic learning and development opportunitiesincluding job rotations to broaden your expertisewe empower you to define and shape your own success. When you join the IESO heres 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

February 5 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 environmentone that values every team members 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. Were proud to say weve been recognized as a supportive inclusive employer.

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