On May 8, 2024, the spread between Mont Belvieu isobutane and normal butane soared to 60.5 cents per gallon (red oval in graph below), a level surpassed only once before, one day back in 2018. This spike was attributed to strong demand for isobutane to produce alkylate and exported MTBE for octane enhancement, further amplified by the start-up of Next Wave’s ethylene-to-alkylate plant in early April. At the time, we noted that this foray into unprecedented price differential territory would not be sustainable. But we certainly did not predict what happened next. During the summer, the iso-normal spread dropped like a rock, sinking to NEGATIVE -4.4 c/gal at the end of October, and is still limping along in negative territory so far in November (green oval).

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