System Operator

Date: February 4 2026

Location: Mississauga

Requisition ID: 20466

Status:Regular

Business Unit:Markets and Reliability

Grade/Band: MP4

Annual Pay Range: For standard 40-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 the IESO Control Room. 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.

As a member of the Control Room Operations Team the System Operator helps fulfill the IESOs roles as Reliability Coordinator Transmission Operator and Balancing Authority for the province of Ontario by administering the IESO Controlled Grid (ICG) and the IESO Administered Markets (IAM) on a minute-to-minute basis ensuring a reliable competitively-priced and sustainable electricity supply for the province:

• through intense and timely analysis investigation and execution of control actions;
• in compliance with NERC reliability standards and NPCC criteria;
• within the Market Rules and relevant Regulations;
• through collaborative work with other Operations Team members;
• and under the general direction of the Shift Superintendent.

This is a promotion-in-place (PIP) affected role candidates with lesser qualifications would be considered for a Assistant System Operator role.

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:

monitors/identifies potential compliance issues and surveillance activities within the IESO;
maintains the daily log ensuring all relevant information is documented and correct;
performs other duties comparable in scope and complexity to the Key Responsibilities listed here as required; and
executes specific duties and responsibilities related to the following functions:
IESO Administered Markets;
IESO Controlled Grid;
System for Markets;
Contingency Operation and System Restoration;
Outage Plan;
Tool Set;
Coaching Mentoring and Training; and
Off-Shift Assignments.

IESO Administered Markets (IAM/Markets)

• Immediately direct generation or shed load to mitigate critical conditions and preserve the integrity and reliability of the Bulk Electrical System (BES).
• Coordinate the IAM as per market rules NPCC criteria and NERC standards.
• Manage the inputs to the Dispatch Scheduling and Optimization engine (DSO) review the solution (both real-time (multi-interval optimization (MIO)) and pre-dispatch) to ensure accuracy prepare to manually intervene in the solution if required and provide final approval of the IAM 5-minute dispatch to maintain the balance of load and generation.
• Monitor/identify/investigate/resolve problems in the real-time and pre-dispatch schedules.
• Monitor/assess/recommend/implement/reconcile ancillary services contracts (e.g. voltage support regulation) to meet market rule requirements and recommend further actions if the contract requirements are not being met.
• Implement interchange transactions between the IESO and its interconnected neighbours. This includes verifying the accuracy of NERC E-Tags curtailing tags as required and providing final approval or denial of E-tags and transactions.
• Liaise with neighboring Reliability Coordinators (RC) and Balancing Authorities (BA) to ensure all interchange schedules are correct and agreed to. This includes working to resolve disagreements in schedules and arriving at an agreed to solution.
• Monitor/assess/implement the required control actions to maintain inadvertent interchange as low as possible as per procedures.
• Provide final approval for all planned generation outages and implement connection and disconnection of generators from the ICG into the market tools.
• Implement demand response programs (e.g. OPA DR3 program) as per procedures and direct participants accordingly.
• Implement time error corrections and control actions as directed.
• Reconcile daily reports such as inadvertent market reports etc.

IESO Controlled Grid (ICG/System)

• Immediately direct generation reconfigure transmission or shed load to mitigate critical conditions and preserve the integrity and reliability of the BES.
• Coordinate the operation of the ICG as per market rules NPCC criteria NERC standards and Operating Agreements.
• Monitor/assess/validate/update Operating Security Limits (OSLs) used to maintain system reliability throughout the day.
• Monitor/assess/implement/direct the operation of the ICG to maintain all equipment within the ratings provided by market participants including day-to-day voltage control and power quality.
• Monitor/assess/implement/direct items to provide Area supply provide ancillary services maintain pre- and post- contingency voltage respect thermal and stability limits implement control actions and respect transmission capacity and tie-line capacity between the IESO and its interconnected neighbors.
• Implement industry-based processes and procedures as required (e.g. Intertie Distribution Calculator (IDC) Transmission Loading Relief (TLR) etc.).
• Recognize deficiencies/errors in displays and drawings and recommend and request revision.
• Run system studies to determine the effect of different generation and transmission configurations upon the ICG. Provide recommendations to the Senior Operations Officer.

System for Markets (SFM)

• Create/check for accuracy/publish System Status Reports (SSR) for current day and next day to notify the market place of the status of the ICG and IAM.
• Manage the inputs required for the Energy Management System (EMS) and DSO to ensure an accurate consistent and economical solution.
• Monitor/assess/recommend/implement hourly changes to items such as Operating Reserve Area Supply OSLs loop flows post-contingency conditions transmission capacity and inter-tie capacity to ensure an accurate consistent and economical solution.
• Ensure the accuracy of the OSL activation plan. Manage and create OSL limits as directed for unplanned outages and out-of-scope conditions.
• Monitor/assess/approve/deny the submission of offers and bids into the IAM as per Market Rules.
• Submit offers on behalf of market participants in the event of market participant tool failures.
• Run reports and produce the daily energy summary report for the Shift Superintendent used in the Morning Report.
• Select re-preparation actions as directed and required.

Contingency Operation and System Restoration

• Have knowledge and implement contingency plans in preparation for the loss of a generator or transmission system element to maintain the reliability of supply throughout the ICG and protect the integrity of the Eastern Interconnection. This includes actions that are not documented and require staff to develop and implement plans based on good operating practice operating agreements and equipment ratings with the cooperation of affected market participants.
• Implement demand limits as directed for out-of-scope conditions.
• Recommend plans and direct market participants to remove equipment from service.
• Plan/coordinate/supervise/direct the actions of internal (Ontario) and external (outside Ontario) entities for system restoration following a major system disturbance or energy emergency. This may include operation that is beyond the scope of past practice and may require execution of undocumented actions.
• Implement actions as directed to manage the IAM and ICG following a full or partial loss of the EMS and/or MIS systems.

Outage Plan

• Assess/coordinate/revise the outage plan accordingly as real-time approaches to accommodate any changes required.
• Assess any short notice and forced outages that may affect the outage plan for the day and change the outage plan accordingly.
• Work with market participants to review switching plans to determine if they meet system requirements.
• Work with market participants to ensure the accuracy of outage data. This includes start/end times correct equipment isolated and that all information is kept up-to-date.
• Enter forced/planned outages on behalf of market participants when required and provide an electronic response.
• Have an understanding of the impact of generation and transmission outages and the way they are processed in the EMS and DSO systems to ensure a proper outcome.
• Notify Operations Planning staff (i.e. those IESO staff that prepare and deliver the daily Operating Plan) of all critical forced outages and extensions that affect their time-frame.
• Provide Final Approval for all planned generation and transmission outages.

Tool Set

• Have an understanding of the DSO and EMS systems - how they are different and how inputs such as OSLs and outage slips are handled differently.
• Have an understanding of how all the individual programs work on both the EMS and MIS systems and how to manipulate the inputs to achieve the required results.
• Perform general performance checks each shift to ensure the results produced are correct.
• Identify performance issues to the appropriate support staff for repair.
• Perform a detailed assessment of the performance of the EMS and MIS systems following Network Model Builds and software releases.

Coaching Mentoring and Training

• Contribute to the training program to ensure that department staffing is adequate as it relates to the certification and technical requirements of the operations functions. This includes coaching/mentoring junior staff exercising periodic/limited supervision over designated Control Room staff mainly directed to work assignment checking work and giving instruction.
• Obtain and continually train to complete the required CEH hours to maintain NERC certification as per NERC standards. Keep up-to-date on advancements or changing technology government policy programs NPCC criteria and NERC standards pertinent to the field of system operations.
• Conduct special studies/analyses of market and/or system operations as required.

Off-Shift Assignments

Undertake off-shift assignments to gain necessary experience in departments that support system operations. Lead/support working groups preparation or review of operational analysis instruction or tool development. As examples:

• Prepare reports such as System Control Reports and Incident Reports. Provide further input to support staff related to system events.
• Review and recommend changes to operating documentation and procedures acting as a Subject Matter Expert (SME) while advocating for the interests of the control room.
• Perform user acceptance testing of new software and tools.
• Participate in committees and internal audits collecting and presenting information on operational issues.
• Prepare and present training material for both internal and external parties.
• Identify user requirements for tools used for system operations.
• Liaise with market participants and interconnected companies to assist in administrative or technical projects/programs or emergency issues.
• Collaborate with other segments of the IESO in the study planning development preparation testing and implementation of programs/projects with an impact upon system operations.

Note regarding mental pressure
There is frequent and sustained mental pressure associated with the technical nature and sustained concentration associated with the position. Considerable mental pressure is tied to the decision-making authority relative to the minute-to-minute operation of the electricity delivery system on a 24/7/365 schedule (shift position).

In a typical day you will works collaboratively with other Operations Team members to execute the minute-to-minute administration of the IESO Controlled Grid (ICG) and the IESO Administered Market (IAM) to ensure a reliable competitively priced and sustainable electricity supply for the province and help fulfill the IESOs roles of Reliability Coordinator Transmission Operator and Balancing Authority for the province of Ontario.

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 a strong knowledge of electrical theory power system design operation and control associated mathematics and computer applications to undertake system control and management of the IMO-controlled grid. Requires analytical and marketing skills knowledge of technical writing to prepare reports and oral and written fluency for effective communication.
• This knowledge is considered to be normally acquired through post-graduate education beyond secondary school plus further extensive theoretical study of subjects pertinent to the electrical discipline and the specialty area of the work function. The job also requires being NERC-certified.
• Requires experience to acquire a full understanding of the Interconnected Power System Operations of NERC and NPCC guidelines; of Agreements; of Market Participant equipment capabilities and technical Directives; of the Market Rules; of Market Participants; of the Facilities Description Documents of Market Manuals and Market Procedures; of pertinent Station Data and of all EMS-related software programs. Requires experience with analytical studies and the application of PC operations including program management and organization of files and directories and various software.
• A period of over 6 years and 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 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

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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