New York-based Riverstone said this week that the fund, called Riverstone Global Energy and Power Fund V, will continue the firm's strategy of "building energy and power businesses around the world with exceptional management teams".
The firm had originally sought out $6 billion for the fund, which has already invested $2.3 billion in 19 companies.
Last week, Riverstone said it had hired former Anadarko chief executive Hackett as a partner and co-head of its Houston office.
