Before the shale era, the price relationship between two NGLs – propane and natural gasoline, was relatively stable, at about 65%.  Both varied primarily with crude prices, with the relationship diverging during periods of high propane demand such as cold winters.   But the shale revolution put an end to that stable relationship, with massive production growth resulting in propane surpluses requiring significant exports to balance the market, but with inadequate export capacity available in some years.  As shown in the left graph below, since 2012, the ratio of propane to natural gasoline has vacillated between a low of 42% in 2015 to a high of 67% in 2021, with the most significant determinants of that relationship the demand for propane in international markets and the capacity available to meet that demand and relieve domestic propane surpluses through exports.

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