Two emissions mitigation systems, as CO2 capture and storage (CCS) and concentrated solar power (CSP) have been investigated to a power plant based on exergetic and exergoenvironmental analyses. A base plant of natural gas combined cycle for power production is taken as case study. The CSP technology used is parabolic trough collector (PTC) with two storage tanks. The environmental impact indicator used is the eco-indicator 99. The outcomes indicate that the natural gas heater exchanger should have its exergy destruction reduced to improve the performance of all system. The CCS plant reduced the net power and the PTC plant increased slightly the net power in relation to the base plant. The specific environmental impact of CCS plant was increased and of PTC plant was slightly decreased. The environmental impact of fuel production is the main environmental burden in the environmental performance. Therefore, the PTC system is the best case of mitigation system. Discussions about further improvements have been proposed. (C) 2019 Elsevier Ltd. All rights reserved.