This interactive map illustrates the many components that make up Ontario’s energy system. Click on each layer to reveal information on Ontario’s 21 energy planning regions, local distribution company service areas, transmission, and generation facilities. Each layer of the map can be displayed independently with some combined for comparison.
This layer displays generation facilities with installed capacity of over 20 megawatts (MW) connected to the high voltage transmission grid. Ontario’s 36,928 MW of installed generation capacity includes nuclear, hydro, gas, wind, solar and biofuel.
This layer shows the high-voltage IESO-Controlled Grid which includes 115 kilovolt (kV), 230 kV, and 500 kV transmission lines that span the province. There are over 30,000 kilometres of transmission lines in Ontario.
Note: For areas where two transmission lines run parallel, the higher voltage line is shown.
Select this layer to reveal service boundaries of all local distribution companies (LDCs) in the province. Local distribution companies operate the low-voltage grid to deliver power to 4.9 million consumers. Zoom in to see additional LDC names. For more information on each LDC, see ieso.ca/findutility.
The IESO conducts regional planning in which local stakeholders contribute to the development of integrated solutions for reliable electricity service to Ontario communities. This map layer shows the 21 planning regions.