Sodium glycinate absorption and ethylene carbonate synthesis from a mixture gas of ethylene oxide and carbon dioxide are evaluated as carbon dioxide capture and utilization system for gas engine flue gas. The energy requirement for CO₂ capture is estimated at 3.3 GJ/tonne CO₂. The ethylene carbonate synthesis utilizes more than 90% of the captured CO₂ and supply 2.5 GJ/tonne CO₂ of thermal energy, which is 76% of the energy requirement for CO₂ capture. The thermal integration of the sodium glycinate absorption and the ethylene carbonate synthesis reduces the energy requirement for CO₂ capture from 3.3 GJ/tonne CO₂ to 0.8 GJ/tonne CO₂. The energy requirement for the CO₂ capture is supplied using the steam saturated at 0.78 MPa from the gas engine without its electric power reduction.