Riverstone Holdings LLC is investing as much as $300 million in Carrier Energy Partners LLC.

Sugar Land, Texas-based Carrier acquires and develops upstream oil and gas assets. 

Riverstone, a private equity firm based in New York, focuses on energy. The firm raised about $26 billion in equity capital since it was founded in 2000.

Riverstone closed a $7.7 billion

energy fund in June. In July, it teamed up with Bridger LLC to invest up to $300 million in the oil company. Before that, in April, Riverstone invested $200 million in Ridgebury Tankers LLC, which operates tankers. 

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