NGL Energy Partners, which owns and operates a vertically integrated energy business, completed the acquisition of Hillstone Environmental Partners, which provides water pipeline and disposal infrastructure solutions, from Golden Gate Capital for $600m. “We are proud to have partnered with Jay and his team to establish Hillstone as an industry-leading provider of comprehensive water infrastructure solutions to the oil and gas industry. In just four years, the company experienced impressive organic growth and structured a high-quality asset base that includes long-term contracts with investment-grade E&P companies.” Dave Thomas, Golden Gate Capital Managing Director.