Причина - отмена судом решения о строительстве нефтепровода Dakota Access:
The pipeline shutdown will also impact pipeline operators in North Dakota, like ONEOK and Crestwood. That's because producers in the region won't have enough pipeline capacity to ship their oil out of Bakken Shale, which will likely impact their ability to expand production. As a result, companies like ONEOK and Crestwood will gather and process fewer volumes while Dakota Access remains offline, which will impact their cash flows and ability to pay dividends.