Perspectives of oxy-coal power plants equipped with CO2 capture, utilization, and storage in terms of energy, economic, and environmental impacts

Semie Kim, Young Il Lim, Doyeon Lee, Wonchul Cho, Myung Won Seo, Jae Goo Lee, Yong Sik Ok

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


CO2-free power plants (PPs) with renewable electricity have promising sustainability implications, but the impact of their widespread use is yet to be determined. Here, the effect of an oxy-coal PP equipped with CO2 capture, water electrolysis, and CO2 methanation on electricity efficiency, CO2 emission rate, CO2 capture cost, and global surface temperatures (Tg) was investigated. By exploiting surplus electricity from renewable sources for electrolysis, we estimated that 5 % of the CO2 emitted from the coal PP was methanized. The process flow diagram of a 500 MWe decarbonized oxy-coal PP was constructed and its impact on energetic, economic, and environmental values was evaluated. The results were applied to a model of the global carbon cycle to predict Tg considering the prospective global population and carbon emission rate (rff) of fossil fuels by 2050. An 80 % replacement of conventional coal PPs worldwide by decarbonized oxy-coal PPs contributed to reducing rff by 6.1 GtCO2/y in 2050 and lowering Tg by 0.09 °C. The additional capital cost to replace 80 % of conventional coal PPs with decarbonized oxy-coal PPs, including associated geological storage costs, was estimated to be $43/tCO2. This study elucidates the promise and limitations of coal PPs designed for CO2 capture, utilization, and storage (CCUS). Combining CCUS technologies with global warming estimates can be extended to examine the economic and climatic impact of CCUS under various CO2 emission sources.

Original languageEnglish
Article number116361
JournalEnergy Conversion and Management
Publication statusPublished - 2022 Dec 1

Bibliographical note

Funding Information:
This work was supported by the NRF grant funded by the Korean Government (MSIT; No. 2021R1A2C1011618), the KETEP, MOTIE of the Republic of Korea (No. 2019281010007B), and the NST grant from the Korean Government (MSIP; No. CRC-15-07-KIER). The authors also appreciate the editing contributions of Ms. Hannah Y. Cha.

Publisher Copyright:
© 2022 Elsevier Ltd


  • Carbon capture, utilisation, and storage (CCUS)
  • Climate change mitigation
  • CO methanation
  • Decarbonized power plant
  • Economic analysis
  • Global carbon cycle (GCC)

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology


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