Diversified Energy to buy Birch for $1.8 billion, boost Permian footprint ↧ ↧ Diversified Energy to buy Birch for $1.8 billion, boost Permian foo... U.S.-based Diversified Energy said ​on Wednesday it will acquire ‌privately held Birch for about $1.8 billion, expanding its presence in the oil- and gas-rich ​Permian Basin.