TransAlta's Evolution: From Coal to Renewables, Focused on Grid Reliability and 2030s Growth

TransAlta Corporation, a century-old power generator, has transformed its operations to reduce emissions by 77% since 2005. The company operates a balanced portfolio of natural gas and renewables and is investing in technologies to meet future grid needs, such as the 900-megawatt Brazeau pumped hydro storage facility. TransAlta is focused on delivering "speed to power" by leveraging its existing merchant portfolio, strategic land positions, and interconnection-ready sites to serve emerging digital demand.

Ontario's electricity sector is undergoing significant transformations, driven by a commitment to reduce greenhouse gas (GHG) emissions and meet future grid demands. As of 2021, the province generated 148.3 terawatt-hours (TWh) of electricity, with 91% coming from zero-carbon sources [1]. This article explores the key developments in Ontario's energy landscape, focusing on nuclear refurbishments and renewable investments.

Nuclear Refurbishments

Ontario's nuclear power plants are a cornerstone of its energy production. In 2021, nuclear power accounted for 55% of the province's electricity generation. The Ontario government has been proactive in refurbishing these plants to extend their lifespan and reduce emissions. Notable refurbishments include:

- Bruce Power: Units 6, 7, and 8 have undergone refurbishments, with Unit 6 returning to commercial operation in September 2023 [3].
- Darlington Nuclear Generating Station: Units 2 and 3 returned to commercial operation in 2020 and 2023, respectively, while Units 1 and 4 are expected to return in 2025 and 2026 [2].
- Pickering Nuclear Generating Station: The Ontario government announced support for refurbishing Units 5-8 in 2024 [5].

These refurbishments are part of a larger 17-year program with a $26 billion budget, aiming to extend the life of each unit by 30 to 35 years [2].

Renewable Investments

Ontario is also investing heavily in renewable energy sources to diversify its energy mix and reduce reliance on fossil fuels. Key initiatives include:

- Wind Energy: Ontario leads Canada in wind capacity, with a total capacity of 5,575 MW in 2021 [10].
- Solar Energy: The province had about 80% of Canada's solar capacity in 2021, with 2,669 MW installed [10].
- Battery Storage: Ontario is moving forward with the procurement of seven new battery storage projects totaling 739 MW, in addition to the 250 MW Oneida facility under construction [9].
- Small Modular Reactors (SMRs): Ontario is planning Canada's first grid-scale SMR project, which could see four units with a total capacity of around 1,200 MW built at the Darlington nuclear site by 2036 [6].

Conclusion

Ontario's energy landscape is evolving rapidly, with significant investments in nuclear refurbishments and renewable energy sources. These initiatives aim to reduce GHG emissions, diversify the energy mix, and meet future grid demands. As the province continues to invest in these areas, it is poised to play a pivotal role in Canada's clean energy transition.

References:

[1] https://www.cer-rec.gc.ca/en/data-analysis/energy-markets/provincial-territorial-energy-profiles/provincial-territorial-energy-profiles-ontario.html
[2] Ontario Power Generation. "Darlington Nuclear Generating Station Refurbishment."
[3] Bruce Power. "Unit 6 Refurbishment."
[5] Ontario Government. "Ontario Power Generation's Plan for Pickering Nuclear Generating Station."
[6] Ontario Ministry of Energy. "Canada's First Grid-Scale Small Modular Reactor Project."
[9] Ontario Ministry of Energy. "Battery Storage Projects."
[10] Ontario Ministry of Energy. "Wind and Solar Energy Capacity."