A new coal-fired power plant emits roughly 8 kg of CO2 per kilowatt-hour with an efficiency of 33-40%. Recently, the governments of developed nations are trying to reduce the C02 emission to curb the environment pollution. N.C.–based NET Power is being built in the Houston industrial suburb of LaPorte which uses CO2 in supercritical fluid to run the turbine. It can also capture and sequester carbon dioxide at virtually no additional cost and works on The Allam Cycle as illustrated in the figure.
This combination delivers an efficiency of up to 52 percent (based on the total energy content of natural gas) and emits around 0.4 kilograms of CO2 per kilowatt-hour.