Companhia Energetica de Minas Gerais Cemig, formerly Centrais Eletricas de Minas Gerais, is a Brazil-based holding company primarily engaged in the electricity sector. The Company is mainly active in the construction and operation of systems of production, transformation, transmission, distribution and commercialization of electric power. Additionally, Cemig is involved in the provision of telecommunication services, and purchase, transport and distribution of natural gas. As of December 31, 2011, the Company had a number of subsidiaries, including Cemig Geracao e Transmissao, which operates 46 hydroelectric plants, four thermoelectric plants, two wind farms and transmission lines; Cemig Distribuicao SA, which is engaged in the electric power distribution; Companhia de Gas de Minas Gerais, which holds the concession for gas distribution in the state of Minas Gerais, and Cemig Telecomunicacoes SA, which provides telecommunication services, among others.