Energy Storage Science and Technology ›› 2024, Vol. 13 ›› Issue (6): 2068-2077.doi: 10.19799/j.cnki.2095-4239.2023.0955

• Technical Economic Analysis of Energy Storage • Previous Articles     Next Articles

Economic analysis of large-scale hydrogen energy storage based on theelectric-hydrogen-electricprocess

Qili LIN1,2(), Zhen CHEN1, Xiaohu WANG1, Hongxun QI1(), Wei WANG1   

  1. 1.Engineering Technology Institute for Energy Storage of China Power Engineering Consulting Group Co. , LTD, Shanghai 200333, China
    2.Polytechnic Institute of Zhejiang University, Hangzhou 310058, Zhejiang, China
  • Received:2023-12-28 Revised:2024-01-11 Online:2024-06-28 Published:2024-06-26
  • Contact: Hongxun QI E-mail:qllin@cpecc.net;hxqi@cpecc.net

Abstract:

In line with the "carbon peak, carbon neutral" initiative, the significance of hydrogen energy is increasingly recognized. Currently, hydrogen energy storage, based on the "electric-hydrogen-electric" process, is primarily in the demonstration application phase, with energy storage cost being a critical factor for its competitiveness. However, targeted research on the levelized cost of large-scale hydrogen energy storage (LCOES) is lacking. This study addresses this gap by establishing an LCOES model for hydrogen energy storage power and conducting quantitative analysis on a 25 MW scale hydrogen energy storage power station system. Subsequently, LCOES levels are projected for future scenarios. The findings reveal that the LCOES of the hydrogen energy storage system is 4.758 CNY/kWh. Capital expenditures are primarily attributed to the hydrogen production system (44.66%), while operational expenditures are dominated by hydrogen production costs (42.99%). Electricity prices notably influence hydrogen energy storage costs, with every 0.1 CNY/kWh decrease resulting in an 8.18% reduction in LCOES. Although enhancing power generation efficiency is challenging, it substantially impacts the economics of hydrogen energy storage, with every 10% increase leading to an 11.88% to 12.50% reduction in LCOES. A 10% decrease in the prices of hydrogen production and power generation system equipment correlates with a 6.06% decrease in LCOES. Energy storage duration markedly affects LCOES, particularly with shorter durations. Within the 4 to 8 h range, each additional hour of energy storage could decrease LCOES by an average of 0.394 CNY/kWh. As hydrogen production and fuel cell equipment prices decline and efficiency improves, hydrogen energy storage is anticipated to emerge as a competitive technical solution for long-term and extended-duration energy storage applications.

Key words: hydrogen energy storage, electric-hydrogen-electric, large-scale, levelized cost of energy storage, economic analysis

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