MANY MINDEDSouth Korea tests railway-integrated solar for urban energy
South Korea has identified 28.4 km of surface railway corridors—spanning Seoul, Busan, and Daegu—with 39,760 m² of installable area for photovoltaic systems. Simulated deployment of flexible solar panels (21.4% efficiency) could generate 9.95 GWh annually, matching railway traction demand during 62.3% of the year. Without storage, 19.8% of this power could feed the grid while 17.8% would be curtailed. Adding a 0.5 kWh/kW lithium iron phosphate battery reduces curtailment to 8.5% of generation. The system’s median levelized cost of electricity is 170 USD/MWh on delivered energy—68% probable payback within 12 years with a 40% capital subsidy.
This approach targets South Korea’s dense urban areas where traditional rooftop solar is impractical. By leveraging railway infrastructure, it avoids the land constraints and high installation costs of conventional solar, potentially lowering energy costs for cities while generating grid power during peak demand. The system’s design addresses the dual challenge of urban energy access and grid stability through direct integration with existing rail operations.
For cities struggling with energy affordability, this model could reduce electricity costs for basic needs like lighting and heating. It also advances community energy resilience by generating power where it’s needed most—without requiring new land or extensive grid upgrades. The next step is validating the model at scale using the study’s 17 months of Busan rooftop data and 10,000-run simulations. Key caveats include the 40% subsidy requirement, 21.4% panel efficiency assumptions, and the exclusion of tunnels and shaded sections. Results remain simulation-based with a 13.4% capacity factor—meaning real-world performance may vary.
Source: pv magazine