Abstract: In a system for producing power and capturing carbon dioxide (CO2) at an offshore site, separator units separate a fluid produced from an offshore vessel in fluid communication with a reservoir into water, oil, and gas. The gas is sent to oxy-firing gas turbine generator units. Air separation units separate an air into nitrogen and oxygen. The oxygen is sent to the oxy-firing gas turbine generator units. Gas compression units compress an exhaust gas from the oxy-firing gas turbine generator units. Dehydration units dehydrate the compressed exhaust gas, and a portion of the dehydrated compressed exhaust gas is recycled back to the oxy-firing gas turbine generator units. Gas pumps inject a remaining portion of the dehydrated compressed exhaust gas into the reservoir. Additionally, the oxy-firing gas turbine generator units generates electricity with the oxygen, the gas, and the portion of the dehydrated compressed exhaust gas.