U.S. refiners have been enjoying some very good times the past couple of years. Most important, refining margins have soared due to a tight global product supply/demand environment brought on by, among other things, the post-COVID demand recovery, refinery shutdowns, Russia/Ukraine war effects, and high natural gas prices. Traditionally, the bulk of refining margins have come from (1) robust “crack spreads” (the general yardstick for measuring overall refining sector health, simply by taking the difference between a basket of refined products and key light sweet crude markets like WTI Cushing or MEH) and (2) the lower crude-input costs that many refineries benefit from, either because of location-related advantages or their ability to process lower-cost crude like medium and heavy sours. But location discounts have narrowed in recent years due to the buildout of pipelines and, as we discuss in today’s RBN blog, the big quality discounts that complex refiners relished through much of last year and the first few months of 2023 have withered. The question is, why?

