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<p>Solid oxide electrolysis cells (SOECs) promise high-efficiency hydrogen production but face two key barriers to large-scale deployment: intensive energy demand and high capital costs of system. These challenges are further compounded by the lack of deployment-oriented techno-economic assessments (TEAs), which limits realistic feasibility evaluation. This study introduces a deployment-oriented TEA framework that addresses these barriers by (i) benchmarking three configurations, i.e., non-integrated (Case A), internally integrated (Case B), and fully integrated with external solid oxide fuel cell (SOFC) system coupling (Case C); (ii) embedding real energy-economic data of South Korea; and (iii) applying a multi-dimensional assessment that spans electricity source variation, inflation, tax, relocation to Japan and China, and sensitivity to key cost parameters. According to the results, heat integration benchmarking improved system energy efficiency from 47.81 (Case A) to 75.65% (Case C). These performance gains translated into a 23% reduction in hydrogen production costs, with the equal energy mix (EEM)-based average levelized cost of hydrogen (LCOH) ranging from 9.84 to 12.81 $/kg using South Korea’s energy-economic data. Beyond this baseline, the multi-dimensional assessment confirmed electricity source as the dominant cost driver, with nuclear and combined-cycle gas turbine (CCGT) yielding the lowest LCOH, while incorporating real inflation and taxation significantly increased costs, underscores the importance of region-specific modeling. Extending the analysis to Japan and China revealed that SOEC-based LCOH is not solely design-driven but largely market-dependent, shaped by location, local energy mixes, and economics. Finally, optimization-based multi-variable sensitivity assessment showed that under favorable conditions, LCOH could fall below $4/kg. Collectively, these results provide deployment-relevant insights, emphasizing the decisive roles of heat integration, electricity structure, and regional economics in achieving scalable and competitive SOEC-based green hydrogen.</p>

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Techno-economic Assessment of Advanced SOEC Systems for Hydrogen Production in South Korea: Bridging System Design and Regional Market Realities

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Syed Shaheryar Ali Shamsi,
  • Ji-Weon Shin,
  • Tae-Hun Kim,
  • Rak-Hyun Song,
  • Seok-Joo Park,
  • Jong-Eun Hong,
  • Hye-Sung Kim,
  • Dong-Woo Joh,
  • Tak-Hyoung Lim

摘要

Solid oxide electrolysis cells (SOECs) promise high-efficiency hydrogen production but face two key barriers to large-scale deployment: intensive energy demand and high capital costs of system. These challenges are further compounded by the lack of deployment-oriented techno-economic assessments (TEAs), which limits realistic feasibility evaluation. This study introduces a deployment-oriented TEA framework that addresses these barriers by (i) benchmarking three configurations, i.e., non-integrated (Case A), internally integrated (Case B), and fully integrated with external solid oxide fuel cell (SOFC) system coupling (Case C); (ii) embedding real energy-economic data of South Korea; and (iii) applying a multi-dimensional assessment that spans electricity source variation, inflation, tax, relocation to Japan and China, and sensitivity to key cost parameters. According to the results, heat integration benchmarking improved system energy efficiency from 47.81 (Case A) to 75.65% (Case C). These performance gains translated into a 23% reduction in hydrogen production costs, with the equal energy mix (EEM)-based average levelized cost of hydrogen (LCOH) ranging from 9.84 to 12.81 $/kg using South Korea’s energy-economic data. Beyond this baseline, the multi-dimensional assessment confirmed electricity source as the dominant cost driver, with nuclear and combined-cycle gas turbine (CCGT) yielding the lowest LCOH, while incorporating real inflation and taxation significantly increased costs, underscores the importance of region-specific modeling. Extending the analysis to Japan and China revealed that SOEC-based LCOH is not solely design-driven but largely market-dependent, shaped by location, local energy mixes, and economics. Finally, optimization-based multi-variable sensitivity assessment showed that under favorable conditions, LCOH could fall below $4/kg. Collectively, these results provide deployment-relevant insights, emphasizing the decisive roles of heat integration, electricity structure, and regional economics in achieving scalable and competitive SOEC-based green hydrogen.