IESO publications provide information and insight into various aspects of Ontario's electricity sector, including 18 month assessments of system adequacy, how businesses can manage their electricity costs, developments in Ontario's electricity market, and more.

To order a hard copy of one of these publications, please email at customer.relations@W88

Power Perspectives

Power Perspectives: Today’s Challenges, Tomorrow’s Opportunities describes what's being done by the IESO and others to seize the opportunities emerging from the unprecedented transformation of Ontario’s electricity sector. Learn what the IESO and its sector partners are doing to ensure Ontario’s power system functions reliably today and into the future.

This publication provides an overview of some drivers of change in Ontario’s electricity sector, including emerging technologies, customer expectations, and increased digitalization. It touches on a number of key themes including innovation, cybersecurity, engagement, reliability, and continuous improvement.

Ontario Planning Outlook

Ontario Planning Outlook

The IESO’s Ontario Planning Outlook (OPO) is a technical report that provides a 10-year review (2005-2015) and a 20-year outlook (2016-2035) for Ontario’s electricity system.

En français

Demand Response Brochure

Demand Response

Demand response is a smart approach to managing energy costs. Learn more about the many ways the IESO is expanding the possibilities for demand response in Ontario.

Find out more about Demand Response.


An Energy Management Guide for Business

Understanding how and when your facility uses electricity will help your business manage its energy needs and meet its energy targets. The refreshed brochure, The Bottom Line on Energy Management: Making Ontario’s Electricity Market Work for Your Business explains how your company can reduce electricity costs with more efficient energy use.

This brochure highlights professional energy managers and the critical role they play in achieving their organization's energy management goals; an explanation of your electricity bill, including a guide to effectively managing your global adjustment costs; and case studies of demand response providers. Download a copy of the report or request a free printed copy from marketing@W88

18 Month Outlook

18-Month Outlook (Current Report)

The 18-Month Outlook reports on the near-term reliability and operability of Ontario's power system. This quarterly publication assesses the adequacy of available supply and transmission to meet forecasts for Ontario's demand over the upcoming 18-month period. It is used by market participants and industry stakeholders to inform their business decisions and to help plan equipment outages.

See all 18-Month Outlook reports in the Document Library (select 18-Month Outlook filter).

Conservation Progress Report

Quarterly Conservation Progress Report (Current Report)

The Progress Report highlights the results of conservation programs by quarter, including savings for residential, business, and industrial programs, and the number of program participants. Fourth quarter
reports also detail savings results and program participation totals for the entire year.

Find more information on the IESO's commitment to conservation and energy efficiency in the 2015 Conservation Results Report.

See all quarterly and yearly conservation reports in the Document Library.

contracted electricity supply report cover

Quarterly Contracted Supply Report (Current Report)

The Progress Report on Contracted Electricity Supply provides a status of the IESO’s contracted generation capacity in both the Ontario transmission and distribution grids.

See all quarterly contract supply reports in the Document Library.




Ontario-Quebec Interconnection Capability

Ontario-Québec Interconnection Capability: A Technical Review

This review was developed by the IESO in response to a request from the Deputy Minister of Energy for an updated technical review of Ontario’s interconnection capability with Québec. Building on the 2014 report, The Review of Ontario Interties, and using updated modeling and analysis, this technical review presents several cases in which expanding the eastern Ontario transmission system could enable Ontario to maximize the firm import capability of the existing tie-lines.