After averaging a meager $2.26/MMbtu during April and May, natural gas prices are starting to recover due to strong power generation demand driven by hot weather, with the July Henry Hub contract settling at $2.632/MMbtu on Friday up $0.10/MMbtu. Higher gas prices are likely to encourage more ethane ‘rejection’, meaning ethane production at gas processing plants sold as natural gas rather than recovered as liquid ethane destined for the petrochemical feedstock market. When ethane prices are higher than natural gas on a BTU basis, less ethane is rejected, while lower ethane prices encourage more ethane rejection.
The graph below is the Mont Belvieu ethane price on a BTU basis, divided by the price of gas at the Henry Hub (front month futures). As shown, the ratio was up to 1.75X in February, which encouraged the recovery of ethane, thus lower volumes were rejected. However, the ratio has been falling steadily since March, dropping on Friday to 1.21X, the lowest level since late January. As natural gas prices respond to hot weather and ethane prices continue to be under pressure due to weak petrochemical demand, it is likely that the Ethane-to-HH Gas ratio will continue to weaken, encouraging more ethane rejection.