Can Ontario's Bedrock Become a Carbon Vault?

University of Waterloo researchers set the first pressure-constrained CO₂ storage benchmarks for Ontario's prime subsurface target

8 May 2026

Southwestern Ontario's carbon storage ambitions just got a lot more credible. A University of Waterloo study, published in the peer-reviewed journal Fuel, delivers the first pressure-constrained assessment of CO₂ storage capacity in the Cambrian Formation, the sandstone layer the province has designated as its primary geological target.

That distinction matters. Earlier estimates were unconstrained volumetric figures, numbers that looked impressive on paper but overstated what engineering reality permits. Using a six-step framework, researchers linked formation-scale capacity to pressure-limited single-well performance, then scaled the analysis across multi-well configurations. What emerges is a benchmark grounded in what can actually be injected, not what can theoretically fit.

Location gives the Cambrian sandstone a strategic edge. Buried more than 800 meters deep and sitting adjacent to Ontario's densest cluster of heavy industrial emitters, it is close to Chemical Valley's refining corridor. That proximity keeps transport infrastructure costs well below what more remote sites would demand.

Among all injection techniques evaluated, horizontal wells proved the clear standout. Swapping conventional vertical injectors for 3-kilometer horizontals improves injectivity by up to 233%. Pair that with controlled brine extraction and formation pressure, the central constraint on how safely CO₂ can be stored at scale, stabilizes meaningfully.

Researchers are candid about what remains unknown. Sparse subsurface data limits precision, and Firoozmand and Leonenko call for a dedicated research borehole to generate the site-specific measurements any real project will require before construction begins.

Timing, though, is pressing. Ontario opened commercial carbon storage permit applications in early 2026 under the Geologic Carbon Storage Act, with government projections pointing to nearly $1 billion in industrial cost savings and millions of tonnes in annual emissions reductions. Grounding those projections in defensible engineering numbers positions southwestern Ontario as Canada's next serious front for geological carbon storage.