AltaGas Ltd. Is a Canada-based diversified energy infrastructure business with a focus on natural gas, power and regulated utilities. AltaGas has three operating segments, Gas, Power and Utilities. AltaGas' Gas segment serves producers in the Western Canada Sedimentary Basin (WCSB) and includes natural gas gathering and processing, natural gas liquids (NGL) extraction and fractionation, transmission, storage and natural gas marketing. The Power segment includes 589 megawatts of generating capacity from gas-fired, coal-fired, wind, biomass and run-of-river assets. AltaGas owns 50% of the Sundance B Power Purchase Arrangements (PPA), giving it the rights to power output and ancillary services from coal-fired base-load generation. In October 2013, AltaGas Ltd acquired a 25% stake in Petrogas Energy Corp.