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Refinery Utilization

The percentage of a refinery's crude-processing capacity that was actually used over the period -- barrels processed divided by nameplate capacity. It is the throughput-efficiency metric for a refiner, and it swings with both demand and maintenance: utilization drops during scheduled turnarounds (major maintenance) and unplanned outages, and rises when margins are strong enough to run flat out. Because a refinery has high fixed costs, high utilization spreads those costs over more barrels and is essential to profitability; a sustained drop in industry-wide utilization can also tighten product supply and lift margins for the refiners still running.

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