4Gas Holding B.V. is an independent company dedicated to developing and operating LNG import terminals around the world.

During the period of Carlyle's ownership, Belden & Blake Corporation was an independent oil and gas exploration and production company with principal operations in the Appalachian basin in Ohio, Pennsylvania and New York and in the Antrim Shale in Michigan.

During the period of Carlyle's ownership, Buckeye Partners, L.P. was a publicly traded partnership that primarily transported, stored and distributed refined petroleum products. Carlyle/Riverstone owned the general partner of Buckeye.

During the period of Carlyle's ownership, CDM Resource Management, Ltd. was a natural gas contract compression services company that operated high horsepower units primarily in gas producing regions of south Texas and Louisiana. CDM focused on delivering a complete customer solution to optimize gas production at the field level and reduce field costs.

Cobalt International Energy, L.P. is an oil and gas exploration and development company focused on pursuing niche opportunities in the Deepwater Gulf of Mexico and offshore international areas. Cobalt's strategy is to utilize its regional expertise along with advanced technology to identify and develop meaningful reserve targets in select offshore ventures.

During the period of Carlyle/Riverstone's ownership, Kramer Junction was comprised of five 30-megawatt solar-thermal projects that produce renewable energy under long-term contracts with Southern California Edison. The projects were managed and co-owned by FPL, the industry's leading renewable operator.

Legend Natural Gas, LP is a North American natural gas focused acquisition, development and exploitation company.

Legend Natural Gas II, L.P. is a North American natural gas focused acquisition, development and exploitation company comprised of all the key managers from "Legend I" and deploying the same strategy.

During the period of Carlyle's ownership, Magellan Midstream Partners, L.P. (formerly Williams Energy Partners L.P.) was a publicly traded partnership formed to own, operate and acquire a diversified portfolio of energy assets. The partnership primarily transported, stored and distributed refined petroleum products and ammonia.

Mariner Energy, Inc. is an independent oil and gas exploration and production company with principal operations in the Gulf of Mexico and west Texas.

Petroplus Holdings AG is one of Europe's leading independent refiners and wholesalers of petroleum products.

During the period of Carlyle's ownership, SemGroup, L.P. gathered, transported, stored and marketed crude oil, refined products, natural gas liquids and natural gas in the U.S. and Canada. SemGroup also owned and operated strategic pipelines, storage terminals and other midstream assets.

Stallion Oilfield Services provides drill site products and services including accommodation units, surface equipment, and solids control services for oil and natural gas exploration companies in the Gulf Coast, South Texas, ArkLaTex, Fort Worth Basin, Permian Basin, and Rocky Mountain regions.

Topaz Power Group, LLC is a 3,350 megawatt generation portfolio located in the South Texas market and operated under a management agreement with 50% equity partner, Sempra.