Ontario's Energy Capacity
Over the past decade, wind, solar, bioenergy, hydro, refurbished nuclear and natural gas-fired resources have replaced Ontario’s coal fleet. These resources, together with investments in conservation, demand response and transmission have reduced greenhouse gas emissions in Ontario’s electricity sector by more than 80 percent.
The current installed capacity on Ontario’s transmission grid is approximately 37,000 MW. In addition to transmission-connected generation, there is currently more than 3,400 MW of generation capacity within Ontario’s local distribution systems. The largest percentage of distributed generation, also known as embedded generation, is from solar facilities.
Current installed capacity - transmission system
This chart shows Ontario’s current installed energy capacity by fuel type on Ontario's transmission system, as reported in the most recent Reliability Outlook, released September 2019. These figures do not include the capacity of embedded generators that operate within local distribution systems, except those that are registered to participate in Ontario’s wholesale electricity market.
Interested in how much energy is currently being produced by Ontario’s energy resources? The IESO publishes hourly generation output by fuel type. See Power Data for real-time data.
Read how the IESO is working with stakeholders to evolve the electricity market, enhance its electricity market design to improve market efficiency and unlock future opportunities.