Energy Capital Partners Management, LP (ECP) is an American investment firm headquartered in Summit, New Jersey.

The firm has additional offices in New York City, Houston, San Diego, Fort Lauderdale and Seoul.

[3] In September 2009, ECP formed Summit Midstream Partners, a platform company to invest in North American gas infrastructure.

[15] In October 2024, ECP and Kohlberg Kravis Roberts formed a partnership to invest a combined $50 billion in data center and power generation projects to support the development of artificial intelligence.

[16] In 2007, ECP acquired a small stake in Energy Future Holdings as part of an investor consortium buyout led by Kohlberg Kravis Roberts and TPG Inc. for $44 billion.

[11][22][23] In January 2023, it was reported that ECP was working with Sumitomo Mitsui Trust Bank to establish a Japan decarbonization fund.

[25] In May 2024, ECP finalized the acquisition of Atlantica Sustainable Infrastructure, which owns renewable energy projects worldwide.

The $2.56 billion transaction helped Algonquin Power and Utilities reduce debt and revamp its capital structure.