Warburg Pincus LLC, the private-equity firm where former Treasury Secretary Tim Geithner is president, raised $4 billion in less than a year for its first fund dedicated to energy investments.

Warburg Pincus Energy LP, which started gathering money in November 2013, exceeded its target of $3 billion and reached its maximum limit, the New York-based firm said in a statement today. The pool will invest alongside Warburg Pincus’s global private-equity fund, an $11.2 billion vehicle raised last year.

Founded in 1966, Warburg Pincus has deployed more than $9.5 billion in energy-related companies globally. The firm’s investments include Antero Resources Corp., which raised $1.57 billion in an initial public offering last year, as well as Targa Resources Corp., Kosmos Energy Ltd. and Laredo Petroleum Inc. The fund, overseen by managing director Peter Kagan, will focus on oil and gas exploration and production in North America, as well as midstream, mining and oilfield services opportunities, Warburg Pincus said.

Investment firms including Blackstone Group LP, KKR & Co. and EnCap Investments LP have sought billions of dollars to take advantage of growth spurred by the shale boom over the past decade and oil demand from emerging markets. EnCap is seeking $5 billion for its 10th fund, two people with knowledge of the plans said this month.

“We have honed our approach over our decades of investing in the industry,” Chip Kaye, Warburg Pincus’s co-chief executive officer, said in the statement.