AGL Energy Limited (AGL) is engaged in buying and selling of gas and electricity; construction and/or operation of power generation and energy processing infrastructure; development of natural gas production and storage facilities, and exploration, extraction, production and sale of coal seam gas (CSG). AGL operates in four segments: Retail Energy, which includes selling natural gas, electricity and energy-related products and services; Merchant Energy, which is engaged in developing, operating and maintaining power generation assets; Upstream Gas, which includes investments and operations in gas exploration and among other activity, and Energy Investments. In July 2012, it acquired the remaining 67.46% interest in Great Energy Alliance Corporation Pty Limited. On 30 April 2012, AGL acquired the development rights for the Silverton wind farm in New South Wales through the acquisition of 100% interest in Silverton Wind Farm Holdings Pty Limited. On 25 July 2011, AGL acquired EKO Energy.