California Oil & Refining Capacity Example of a Supply Chain Bottleneck

California’s oil and gas supply chain provides a clear example of what happens when demand and supply become misaligned. Since 2019, California’s oil production has declined by approximately 40%, increasing reliance on imports and reducing flexibility when disruptions occur. At the same time, the state has already reduced refining capacity by roughly 25% since 1980, and additional refinery closures are expected to reduce remaining capacity by nearly 20% in the coming years. These changes create a classic supply chain bottleneck. Even if oil production increases, refining capacity may not be available to process the additional supply. One part of the supply chain can support demand while another cannot. As a result, the constraint limits the performance of the entire system, creating higher costs, reduced flexibility, and increased vulnerability to disruption.

The Same Challenge Exists in Manufacturing

Manufacturers and distributors face similar situations every day. A supplier may have sufficient raw materials, but production capacity becomes constrained. Manufacturing may be capable of increasing output, but transportation capacity cannot support customer demand. Inventory may be available, yet labor shortages prevent products from reaching customers on time. 

In each case, the bottleneck is not necessarily where the problem first appears. The constraint exists at the point where demand exceeds available capacity. For example, in a beverage manufacturer, supplier capacity was constrained although production capacity was available. Without ingredients, shortages still persisted. This is why successful organizations evaluate demand and supply across the entire end-to-end supply chain rather than focusing on individual functions in isolation.

Align Demand and Supply at Every Step

The most effective supply chains continuously assess demand and supply at each stage of the process. They understand where capacity exists, where risks are emerging, and where future constraints could limit performance. One of the best ways to achieve this alignment is through a formal SIOP (Sales Inventory Operations Planning) process. SIOP brings together sales, operations, supply chain, and finance teams to evaluate demand, assess supply capabilities, identify potential constraints, and develop plans before bottlenecks occur.

By identifying risks early, companies can make better decisions about sourcing, production, inventory, logistics, and customer commitments. They can improve responsiveness, reduce risk, and support profitable growth even in periods of disruption. The bottom line is straightforward: supply chain performance depends on aligning demand and supply throughout the end-to-end supply chain. Organizations that proactively identify constraints and address bottlenecks before they impact customers will be best positioned for long-term success.

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