A Canadian startup raised $55 million from venture capital firms and governments to begin a carbon-capture plant in Quebec, using a technology that aims to suck millions of tons of emissions out of the atmosphere and oceans. 

Deep Sky Corp. was founded by Frederic Lalonde, chief executive officer of Hopper Inc., a Montreal-based air-travel application company that’s one of Canada’s most valuable technology startups.

Whitecap Venture Partners, BrightSpark Ventures, the venture arm of Ontario Municipal Employees Retirement System, and the Canadian and Quebec governments are behind the Deep Sky funding round for its first large-scale carbon removal plant. Deep Sky has partnered with direct-air capture companies such as London-based Mission Zero Technologies Ltd. to test its technology.

“Even trees are not enough,” Lalonde said in an interview. Hopper has planted 25 million trees to try to offset the carbon footprint of its users and has a commitment for 30 million more, but he wants to go further. “What else could I buy that actually cancels out the emissions of the plane?”

That’s why he launched Deep Sky. Its initial objective is to remove about 300,000 tons of carbon dioxide a year from air and water, from a location to be determined in Quebec. The new capital will be used to select and test the best process, then plan and start the first phase of the plant. 

“In searching for Canada’s next big bet and upon learning about Deep Sky, it became clear that this is a team and a technology worth supporting,” Whitecap’s Shayn Diamond said in a statement. 

As much as C$500 million ($365 million) will be required to bring the site to full scale. Another challenge is the 100 megawatts of electricity needed to run the facility. Hydro-Quebec, the provincial-owned utility, has become stricter on project approvals for its renewable hydroelectric power in the face of a looming shortage. Lalonde argues that the project’s energy consumption can be timed so that it’s “throttling down” at times of day when other industries and consumers need more power.

BloombergNEF reported in August that large corporations including Microsoft Corp. and Shopify Inc. are buyers of direct-air capture offsets, as they are “looking to diversify their sustainability portfolios and willing to pay the premium price tag.” The report added that potential demand now outweighs supply by 20-fold.

Fewer than 30 direct-air capture plants have been commissioned so far in the world, according to International Energy Agency, capturing only 10,000 tons of carbon dioxide per year. “If you think of this century as our last chance to cool the earth, we’re going to need to be at around 20 billion tons a year of capacity removal by mid-century,” said Lalonde.