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Thermodynamic and economic analysis of supercritical compressed carbon dioxide energy storage system integrated with steam cycle for flexible operation of power plant

Author

Listed:
  • Chen, Lei
  • Chen, Yong
  • Xu, Kai
  • Wu, Runzhou
  • Deng, Wei
  • Xu, Jun
  • Jiang, Long
  • Su, Sheng
  • Hu, Song
  • Xiang, Jun

Abstract

With the rapid development of renewable energy grid, coal-fired power plants, which play a role as the largest flexible peak-shaving resource, can promote the absorption of renewable energy and ensure grid stability. This study proposes a novel supercritical carbon dioxide energy storage system (SC-CCES) integrated with a 660 MW coal-fired power plant in which extraction steam is utilized to enhance the water storage heat capacity. A comprehensive thermodynamic model and analysis are conducted to evaluate the performance of the coupled system. The results show that the proposed system can achieve an increase of 15.69 % in system power efficiency, 2.74 % in peak regulation depth, and 0.33 kWh/m3 in energy storage density than the stand-alone SC-CCES. Subsequently, the parametric analysis is performed to study the effect of key parameters on the system performance. The optimal solution and performance criteria are obtained using the non-dominated sorting genetic algorithm-II. Moreover, the techno-economic evaluation indicates a levelized cost of electricity of 0.123 $/kWh and a net present value of 43.74 million$, confirming the integrated system's cost-effectiveness and investment potential.

Suggested Citation

  • Chen, Lei & Chen, Yong & Xu, Kai & Wu, Runzhou & Deng, Wei & Xu, Jun & Jiang, Long & Su, Sheng & Hu, Song & Xiang, Jun, 2026. "Thermodynamic and economic analysis of supercritical compressed carbon dioxide energy storage system integrated with steam cycle for flexible operation of power plant," Renewable Energy, Elsevier, vol. 257(C).
    • Handle: RePEc:eee:renene:v:257:y:2026:i:c:s0960148125024541
    DOI: 10.1016/j.renene.2025.124790
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    References listed on IDEAS

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