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 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 & 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 province's 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 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:

• 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 security‑limit monitoring, including documentation and production implementation.
• Maintain and troubleshoot existing engineering software and databases by identifying issues, coordinating corrective actions, and updating procedures.
• Perform short‑circuit and load‑flow studies using commercial power system analysis tools, including base‑case 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, you’ll 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 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

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 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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