ABB, ABO Wind, Abu Dhabi National Energy Company TAQA, AES Horizons, Anglian Water, Black Sea Trade and Development Bank, By Water, CDB Leasing, ČEZ a.s., Chevron Corporation, China Development Bank, Citibank, Conetwork (Germany), ContourGlobal, Credit Suisse First Boston (CSFB), Czech Export Bank, Dexia Kommunalkredit Bank, East European Investment Fund, Eaton Corporation, EBRD, Edison Trade, Enel, EnergoPro, Enron, Entergy, European CleanTech I SE (Luxembourg), Export - Import Bank of the United States, Gamesa Energy, GASELYS, Gazprombank, GDF Suez, Gruppo Societá Gas Rimini, Hydro Contracting, IBERDROLA, Iceland Energy Group, IHI Corporation, Invenergy, J.P. Morgan Energy Europe, Marubeni Europower (Japan), Mitsui & Co.,Ltd, OMV AG and it’s subsidiary OMV Bulgaria EOOD, Rolls-Royce Power Ventures, RWE Power AG, Scatec Solar, SolaRE, Statkraft Markets, STEAG, Thames Water, The Government of Bulgaria in consortium with CSFB (Europe), The Royal Bank of Scotland, Voestalpine Stahl GmbH