Reaching new peaks: OPG responds to highest electricity demand since 2013

During the peak hour, the bulk of Ontario’s electricity was provided by carbon-free, reliable nuclear generation at 41%. Operating 24/7/365, baseload nuclear power serves as Ontario’s backbone. This was followed by natural gas at 31%, hydroelectric at 20%, imports at 4%, wind at 3%, and solar at 1%.

“While Ontario’s electricity system navigates through tight market conditions and anticipated growth over the coming years, every megawatt counts, especially on extreme weather days like we experienced in the recent heat wave,” said Lindsey Arseneau-MacKinnon, OPG’s Vice President of Energy Markets.

“As Ontario’s largest generator, OPG plays a critical role in meeting provincial demand. The Independent Electricity System Operator relies on us for our strong operating capabilities and flexibility to respond to changing market conditions.”

In the coming years, as Ontario grows and electrifies, electricity demand is expected to rise. OPG and its subsidiaries are preparing for this future by advancing new nuclear in the form of Small Modular Reactors, refurbishing its nuclear operations, investing in its hydroelectric operations, and progressing other new clean energy technologies, such as battery storage and low-carbon hydrogen.

To meet the peak demand earlier this month, all eight available nuclear units at OPG’s Darlington and Pickering Nuclear Generating Stations (GS) generated 20% of Ontario’s power, proving the importance of clean, reliable baseload nuclear power to the grid.

Meanwhile, OPG’s hydroelectric fleet demonstrated its value by generating 4,435 MW. The fleet also time-shifted generation to meet the increased demand, which means storing water overnight when demand is low and generating more electricity during the day when demand is high.

Through natural gas and biomass generation, OPG’s Lennox and Atikokan GS provided valuable energy and operating reserve, demonstrating the flexibility and usefulness of these assets to the grid during times of critical need.

Finally, combined-cycle natural gas stations in OPG subsidiary Atura Power’s fleet generated another 2,487 MW, operating at an 86% capacity factor. Gas generation plays a critical role in maintaining reliability in Ontario’s electricity system as it is versatile and can be easily dispatched when it’s needed most. Atura’s stations were especially important in providing support during this time as the shorter days reduced solar generating capacity.

“Our ability to respond to this increased demand demonstrates the adaptability and flexibility of our teams at OPG and Atura Power,” said Nicolle Butcher, OPG’s Chief Operations Officer. “Our employees’ hard work and dedication have been instrumental in keeping the lights on for Ontarians.”