The third-quarter price of the hypothetical NGL barrel averaged almost 50% higher than the same period last year, with movement in September resembling the tip of a chartable hockey stick that provided the increase.

It was the best month and quarter of the year for prices, and the best September and third quarter since 2014, when the oil and gas down-cycle began.

And while weekly average prices for all NGL tumbled at both the Mont Belvieu, Texas, and Conway, Kan., hubs, a softening of natural gas prices allowed margins for six of the 10 NGL to expand.