5 Best-performing Canadian Cleantech Stocks of 2025
As the world races to meet rising power demand driven by artificial intelligence and advanced computing, cleantech is stepping into a new era of opportunity.
Developing and scaling innovative energy technologies has never been more accessible or cost-efficient, thanks to breakthroughs in AI-driven design, automation and data analytics that are speeding up everything from materials science to grid optimization.
While US climate finance leadership appears uncertain, Canada is emerging as a strong contender for global influence, backed by supportive policy frameworks, abundant natural resources and a deep bench of innovation-focused companies.
Here’s a look at the best-performing Canadian cleantech stocks on the TSX 2025 by year-to-date gains. CSE-listed companies were considered, but none made the list at this time.
Data for this article was gathered on December 16, 2025, using TradingView’s stock screener. Only companies with market capitalizations greater than C$50 million were considered.
Year-to-date gain: 187.23 percent
Market cap: C$472.75 million
Share price: C$2.70
Anaergia is a global company that specializes in converting waste, including wastewater and agricultural and municipal solid waste, into renewable energy, clean water and organic fertilizer.
The company has operations in 17 countries spanning North America, Africa, Asia and Europe. In 2025, Anaergia has expanded its global reach through partnerships with companies in Italy and Spain, as well as through a partnership agreement to build a biogas facility in South Korea.
In July 2024, Anaergia closed the third tranche of a C$40.8 million investment deal with Marny Investissement that gave Marny a controlling interest of about 60 percent in Anaergia, supporting the company’s pivot to employ a greater focus on technology sales and operations and maintenance contracts.
The company’s September investor presentation highlights its new strategy of streamlined operations, expanding through global partnerships and selective Build-Own-Operate delivery.
In its Q3 2025 results, the company reported strong financials, with revenue increasing 77 percent year-over-year to C$51.4 million, gross margins expanding to 28.8 percent and adjusted earnings before interest, taxes, depreciation and amortization (EBITDA) of C$2.6 million.
2. Tantalus Systems (TSX:GRID)
Year-to-date gain: 150.53 percent
Market cap: C$250.03 million
Share price: C$4.76
Tantalus Systems provides technology that gives utilities greater control and insight into their electric grids.
This includes advanced metering infrastructure (AMI), load management systems and grid analytics, all of which contribute to a more efficient and reliable power grid.
One of its key products, TRUConnect AMI, provides real-time data on energy consumption and grid conditions. The TRUFlex Load+DER Management system helps manage energy demand and integrate distributed energy…
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