Independent Electricity System Operator

The Independent Electricity System Operator, known across the sector as the IESO, operates from 2635 Lakeshore Rd W in Mississauga, Ontario, and can be reached by phone at 905-855-2800 or online at ieso.ca. From this office, the organization manages Ontario's power system in real time, plans for the province's future energy needs, enables conservation, and designs a more efficient electricity marketplace to support the sector as it evolves.

Finding the Lakeshore Road office

The office sits on Lakeshore Rd W in Mississauga, a corridor that runs along the western edge of the city near the waterfront. Visitors coming from elsewhere in the region should plan around typical weekday traffic patterns on Lakeshore Road, which tends to be busier during the morning and late-afternoon commute. Because exact opening hours are not published here, anyone planning to stop by in person should call 905-855-2800 ahead of time to confirm when someone will be available to meet.

Address, parking and access

The civic address, 2635 Lakeshore Rd W, is easy to give to a rideshare driver or enter into a mapping app. As with most office buildings along this stretch of Mississauga, arriving a few minutes early gives time to find parking and locate the correct entrance, particularly for a first visit when the building layout is unfamiliar.

Reaching the office by phone or online

Phone remains the fastest way to confirm details before travelling to the Lakeshore Road address. The number 905-855-2800 connects directly to the office, while ieso.ca carries the fuller picture of ongoing work, including current demand and supply data for the province, transmission planning documents, and notices about upcoming stakeholder engagement meetings. Checking the website before calling often answers a question outright and saves a trip.

From a first phone call to a stakeholder meeting

Most people who interact with this office do so either by phone, through written comments on an active engagement, or by attending a scheduled stakeholder meeting; very few interactions resemble a walk-in retail visit. Understanding that flow in advance makes the process easier to follow from start to finish.

The work handled from this office

The scope of activity here covers several distinct areas: real-time management of Ontario's power system, forward planning for the province's energy needs, programs that support conservation, and the ongoing design of the electricity marketplace itself. Separately, transmission planning work results in published recommendations, such as phased plans for new and reinforced infrastructure in different parts of Ontario, which are shared publicly rather than negotiated one-on-one.

What a typical exchange looks like

Someone contacting the office with a general question can expect to be pointed toward the relevant public data, report, or engagement page, since much of the underlying information — demand figures, supply by fuel type, import and export data — is already published and updated regularly. Anyone following a specific transmission plan or funding program should expect a defined timeline: comment periods close on set dates, application windows close on set dates, and stakeholder engagement meetings are scheduled and posted with an agenda in advance, along with materials and recordings from earlier sessions. Arriving at a meeting means arriving with the agenda and any relevant background documents already reviewed, since the discussion builds directly on materials posted ahead of time.

Questions worth asking before you connect

A short call to 905-855-2800 before travelling to Mississauga or submitting a written comment can clarify whether the topic at hand is even handled from this office, and what the next step should be.

Questions about the topic at hand

Useful questions include whether a specific issue falls under real-time system management, long-term planning, conservation, or market design, since each area follows its own process. For funding-related questions, it is worth confirming the current status of the application window and what documentation is expected before applying.

Questions about timing and follow-up

It also helps to ask when the next relevant stakeholder engagement meeting is scheduled, whether materials will be posted in advance, and how to submit written comments if attending in person or by call is not possible. Confirming these details by phone first avoids arriving with the wrong documents or missing a comment deadline.

Frequently asked questions

What can be done if a concern is not resolved through the usual contact?

Anyone who feels a question was not fully addressed can call 905-855-2800 again and ask for the matter to be directed to the team responsible for that specific area, whether it involves system planning, conservation, or a funding program. Following up in writing through ieso.ca is also an option for issues tied to a specific published engagement or application.

How does a first contact with this office usually go?

A first contact typically starts with a phone call or a review of the relevant section of ieso.ca to confirm which area handles the topic, followed by a referral to published data, a report, or an upcoming stakeholder meeting where the matter is being discussed. There is generally a defined next step rather than an immediate resolution during the first exchange.

Is it possible to reach this office in winter as well as summer?

Yes. The work carried out from the Mississauga office, including real-time system management and planning, continues year-round regardless of season, and the phone line and website remain the way to reach the office in any month. Winter travel along Lakeshore Road should be planned with extra time in mind, as with any drive in the region during colder months.

What alternatives exist in the same area for related questions?

Anyone with a question specific to a local power connection or an in-home electrical issue is generally better served by contacting a local distributor or a licensed electrical contractor directly, while questions about province-wide system planning, conservation programs, or market design belong with this office.