This investment will provide Caiman with additional growth capital for the ongoing expansion of its midstream infrastructure network in the Marcellus shale.

Highstar Capital founder and managing partner Christopher Lee said that Caiman will continue to play a key and growing role in helping Marcellus producers get their gas and liquids to market.

Caiman provides midstream services including natural gas and condensate gathering, compression, dehydration, measurement, treating and conditioning, processing, liquids transportation and fractionation.

Highstar Capital currently manages over $5bn of investments on behalf of its managed funds and co-investment vehicles in a diversified portfolio of energy, transportation and environmental/waste management assets and businesses.