Tallgrass shareholders approve Blackstone-led buyout of pipeline operator

HOUSTON (Reuters) - Tallgrass Energy shareholders on Thursday backed a buyout by a Blackstone-led group that valued the U.S. oil pipeline operator at $6.3 billion, a rare case of a pre-market crash deal going ahead without a price cut. Terms were struck ahead of this year's collapse in energy prices that has U.S. oil producers cutting output and pipeline operators reducing their fees to hold onto dwindling business. About 30% of global fuel demand has been lost from business shut downs to..