Sr Analyst Market Invoice

Date: August 25, 2026

Location: Toronto, ON – Hybrid/On-site

Requisition ID: 21238

Status: Temporary, Up to 15-months

Business Unit: Corporate Services

Grade/Band: MP3

Shift Work:

Annual Pay Range: For standard 35-hour work week

Step 1: $104,156 to Step 10: $148,824

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 Finance and Accounting Department in the Corporate Service BU.

What makes this role exciting

The energy sector is rapidly evolving, offering exciting new opportunities for those who want to make a difference.

• To administer the preparation of all invoices to Market Participants (MPs) for the real time and energy forward markets. To administer the preparation of all invoices for Commercial Services and Contract Management agreements. Analyze need and work with other departments in the development/amelioration of systems and processes to deal with new market rules and special circumstances.  Ensure appropriate reconciliation of the invoicing/payment systems in place.  Ensures accurate recording of all invoice related transactions including prepayments, payment of margin calls, transmission rights deposits. Prepare ad hoc manual invoices to charge MPs for late payments, penalty charges and arbitration costs.  Provide reports on non-compliance issues to senior management. Interface with Market Services staff to resolve MP invoicing issues. Address Market Participants’ questions/complaints on invoicing issues from referrals from the Help Centre. Provide limited supervision to staff assisting in the function.

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:

• Administer and participate in the preparation of all market participant invoices for the real time market on a monthly basis and the energy forward market on a weekly basis.  
• Administer and participate in the preparation of ad hoc manual invoices for late payment charges, arbitration costs and compliance penalties. 
• Analyze need and work with other IESO departments to develop/implement new processes as dictated by changes to the market rules or required process improvements. Provide recommendations on streamlining the invoicing functions.  
• Analyze issue from an invoicing perspective and work with Market Services to resolve any discrepancies in the invoice data. Provide subject matter advice regarding issues/questions in response to inquiries from Help Center Staff.
• Research issues raised by external Market Participants or Senior Management regarding Market Participants invoices or payment status/history.  Interact directly with external contacts to resolve these issues.
• Identify and report potential instances of non-compliance with Market rules, both on the part of Market Participant and the IESO.  Provide subject mater expertise to the Compliance unit and the Dispute resolution unit as required.
• Oversee and participate in special circumstances where an invoice may need to be adjusted and resent, cancelled altogether or payment put on hold. Manage prepayments, deposits and refunds. Various financial programs must be carefully run to ensure these unusual processes are done correctly and accounted for properly. Where main systems fail such as commercial reconciliation, manual invoices may also need to be prepared which would entail running several contingency database queries to estimate an invoice for each market participant so the market can still be settled in a timely manner. 
• Ensure the preparation and issue of scheduled statements of activity for each market participant detailing the opening and ending balance and all the invoices issued and payments received or made in the month.
• Oversee and participate in the various system maintenance tasks throughout the month such as:  set up of all charge types for commercial reconciliation systems to use; keep all banking information up to date in the Oracle Financial system; and set up Market Participants to receive invoices in the method they have chosen i.e. MIM or EDI.
• Provide direction and guidance to staff exercising limited supervision of assignment, instruction and checking of result.
• Administer and participate in the issuance of all market participant invoice payments for the real time market on a monthly basis and the energy forward market on a weekly basis. Process invoices in the AP system, generate pay files and transmit pay files to the bank.

In a typical day, you will

• Administer and participate in the preparation of all Commercial Services and Contract Management invoices and invoice payments on a monthly basis. Process invoices in the AP
• Provide direct support to internal and external auditors.
• Complete assigned Market account reconciliations monthly.
• Perform other duties as may be required.

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: 

Education:

• Requires a comprehensive knowledge of business systems, financial and management accounting and reporting, related mathematics, analytical techniques and computer and database systems to create, analyze and issue invoices, reconcile accounts and pay multi million dollar invoices. 
• This knowledge is considered to be normally acquired either through the successful completion of a four-year university degree in a business discipline (Commerce, Economics) or  by having the equivalent education.

Experience:

• Requires a background in financial accounting with specific experience in accounts receivable and accounts payable processes.  
• Requires financial computer system experience and direct experience with A/P and A/R financial applications.
• Requires experience in developing new accounting processes to meet changing reporting needs and taking action to detect and resolve problems as they arise.  
• Requires excellent interpersonal, oral and written communication skills to prepare reports and answer detailed questions from external market participants and work with internal departments at resolving new issues.
• Requires an understanding of the Market Rules pertinent to the financial management and reporting requirement established for the function. Financial based knowledge of the energy industry is necessary. Requires some supervisory experience related to ensuring workflow.  
• A period of over 6 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: August 30, 2026 at 11:59PM

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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