Seasons Change - Winter Demand Offsets NGL Fractionation Capacity Constraints

Y-grade, welcome to the Hotel Fractionation. You can check in any time you like, but you can never leave!  OK, so that’s a bit of an overstatement. But there is no doubt that the U.S. NGL market has entered a period of disruption unlike anything seen in recent memory. Mont Belvieu fractionation capacity is, for all intents and purposes, maxed out. Production of purity NGL products is constrained to what can be fractionated, and with ethane demand ramping up alongside new petchem plants coming online, ethane prices are soaring. But that’s only a symptom of the problem. Production of y-grade — that mix of NGLs produced from gas processing plants — continues to increase in the Permian and around the country. Sooo … If you can’t fractionate any more y-grade, what happens to those incremental y-grade barrels being produced?  How much can the industry sock away in underground storage caverns?  Does it make economic sense to put large volumes of y-grade into storage if it will be years before it can be withdrawn? — i.e., “you can never leave.” And what happens if y-grade storage capacity fills up? Today, we begin a blog series to consider these issues and how they might impact not only NGL markets, but the markets for natural gas and crude oil as well.

Mont Belvieu, TX and Conway, KS, are the two most significant U.S. hubs for NGL trading, storage and fractionation, with the much bigger Mont Belvieu hub primarily serving Gulf Coast and export demand, while the smaller Conway hub is focused on Midwest/Great Plains demand, especially for propane. The pricing dynamics between the two hubs are a key indicator of the supply/demand balance between the regions, but they don’t have the same kind of influence over the direction or magnitude of flows as price differential dynamics often do for other energy commodities. In today’s RBN blog, we will examine the gap between the price of the NGL “basket” in Mont Belvieu versus Conway and what that price spread tells us. 

For 10 years prior to 2018, the differential between propane prices at the Conway, KS, hub averaged less than a nickel per gallon below Mont Belvieu. In fact, between 2013 and 2017, the price spread was only 3.5 c/gal — excluding a winter 2014 Polar Vortex aberration — which basically reflects the cost of moving barrels 700 miles north-to-south. Not this year, though. After starting 2018 at 3 c/gal, the propane price spread took off, and has averaged 18 c/gal since April, some days moving above 26 c/gal, far above the per-bbl cost of transporting propane 700 miles south to Mont Belvieu. Is it pipeline capacity constraints? In part. But there is a much more significant factor driving this differential wider, not only in the propane market, but across all five of the NGL purity products. What is this mysterious factor? To find out, read on. But here’s your first clue: the problem is not in Kansas anymore.