Pipeline Pinch: Can Canada's Crude Oil Infrastructure Keep Pace with Rising Output?

Western Canadian Oil Output Outpaces Pipeline Capacity Growth

Crude oil production in Western Canada is projected to increase by approximately 300,000 barrels per day (bpd) in 2025, driven by robust drilling activity and improved well productivity in the Alberta oil sands and Montney formation. However, the pace of pipeline infrastructure expansion is struggling to keep up. The Trans Mountain Pipeline expansion (TMX), which began commercial service in May 2024, added 590,000 bpd of capacity to the Pacific Coast. Yet, this alone may not be sufficient to handle the anticipated production growth, especially as egress options to the US Gulf Coast remain constrained.

The crude oil price dynamics reflect this imbalance. The discount of Western Canadian Select (WCS) to West Texas Intermediate (WTI) has widened in recent months, signaling that pipeline capacity is being stretched. With Enbridge's Mainline system and the Keystone pipeline operating near full utilization, any further production increases will likely require alternative transport methods, such as rail.

Drivers Behind the Capacity Crunch: TMX Limits and US Border Bottlenecks

TMX Expansion: A Partial Solution with Limits

While the TMX expansion has provided a critical new outlet for Canadian crude to reach Asian and US West Coast refineries, it is already approaching nameplate capacity. The pipeline's throughput has averaged over 550,000 bpd since startup, leaving little room for additional volumes. Moreover, TMX is primarily designed for light and medium crude grades, limiting its ability to absorb the growing output of heavy crude from the oil sands.

US Border Constraints and Heavy Crude Glut

The largest bottleneck remains at the US-Canada border. Enbridge's Mainline system, which carries the bulk of Canadian crude to the US Midwest, is fully allocated. Any incremental heavy crude volumes must compete for space on the Keystone pipeline or be shipped by rail. This structural constraint is a key factor behind the recent widening of the WCS-WTI spread, which has exceeded $15 per barrel at times. Traders can monitor these spread dynamics using technical indicators to identify potential breakout levels.

Key Levels and Assets to Watch: WCS-WTI Spread and Rail Loading

The WCS-WTI differential is the most direct barometer of pipeline capacity stress. If the spread widens beyond $20 per barrel, it historically triggers a surge in rail loading, which can add 100,000-200,000 bpd of takeaway capacity within 2-3 months. Traders should also watch the WTI crude oil price for correlation with Canadian production data. A sustained drop in WTI below $70 could slow drilling activity, easing some pipeline pressure.

Additionally, inventory levels at Cushing, Oklahoma, and in Alberta are key. Rising storage in Alberta would signal that production is outpacing egress, a bearish signal for WCS prices. Conversely, draws at Cushing would indicate strong US refinery demand, supporting the entire complex.

What This Means for Traders: Navigating Infrastructure-Driven Volatility

For energy traders, the Canadian pipeline capacity story is a classic lesson in infrastructure constraints. When takeaway capacity is tight, the producer (in this case, Canadian heavy crude) gets discounted relative to the benchmark, creating a spread trading opportunity. Traders can use signal rooms to discuss real-time spread moves and share ideas on rail loading arbitrage.

However, this is not a one-way trade. Pipeline expansions, regulatory changes, or a slowdown in production growth could quickly narrow the spread. The risk of a reversal is high if new pipeline projects (such as the proposed expansion of the Keystone system) receive approval. Moreover, OPEC+ production decisions and global demand shifts can overshadow local infrastructure dynamics. A trader's approach should be to treat the WCS-WTI spread as a mean-reverting instrument, using educational resources to understand the fundamentals behind the moves.

For beginners, this is a prime example of how physical infrastructure impacts price relationships. Learning to analyze pipeline flows, storage data, and differentials is a valuable skill. You can find your trading style by exploring which asset class—crude oil spreads, equities, or currencies—best suits your risk tolerance.