Blackstone Group is buying energy money management firm Harvest Fund Advisors as an addition to its GSO credit business, said Matt Anderson, Blackstone spokesman. GSO has $94.5 billion in assets under management; Harvest has more than $10 billion in AUM. Terms of the deal are not being disclosed. It is expected to close in the fourth quarter. Harvest specializes in investing in master limited partnerships holding U.S. midstream energy projects, managing funds and separately managed accounts. The acquisition will give Blackstone additional, complementary expertise in the energy arena, Mr. Anderson said.