Capstone Turbine Corporation (www.capstoneturbine.com), the world's leading clean technology manufacturer of microturbine energy systems, today announced it released configurations of the C30 compressed natural gas (CNG) microturbine that meet or exceed emissions standards, including the U.S. Environmental Protection Agency and California Air Resources Board (CARB) 2010 requirements for On-Road Heavy Duty Diesel Engines (HDDE) for Urban Bus.