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Sector Participants > Market Oversight

Market Oversight

The IESO’s mandate is to support the objectives of the Electricity Act in many respects, including the promotion of an efficient and reliable electricity market and power grid. These goals are furthered by fostering compliance with the Ontario wholesale market rules and the North American reliability standards through enabling and enforcement measures, and conducting assessments of the market’s performance. The IESO's Market Assessment and Compliance Division (MACD) is a ring-fenced business unit which conducts these activities.

Enabling Compliance

MACD enables compliance by the provision of services that provide information to market participants and the IESO to foster compliance on a forward looking basis. These enabling services include providing, upon request or on its own initiative, compliance and enforcement guidance for specific market rules.

Compliance Enforcement

MACD enforces compliance through the detection and investigation of potential breaches of the market rules. The Director of MACD has the authority to issue non-compliance rulings and impose sanctions, including financial penalties, when the rules have been breached. MACD also administers other rules which may result in repayments to the market.

Market Assessment

MACD’s Market Assessment Unit supports the OEB’s Market Surveillance Panel in monitoring, investigating and reporting on the activities and conduct of market participants and the IESO in Ontario's electricity market, for the purpose of improving market performance.


Dispute Resolution

The IESO’s dispute resolution process is designed to resolve disputes between parties in the Ontario electricity marketplace, in the most expeditious and cost-effective way.