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As companies increasingly join RE100 campaign to overcome the climate crisis, the importance of achieving RE100 in industrial complexes, which account for over 70% of Korea’s manufacturing exports, is growing to maintain export competitiveness. This paper analyzed the economic feasibility of each participant in the renewable energy electricity storage and sales business that utilizes surplus power from solar power generation of a nearby school to achieve RE100 in industrial complexes. Results show that under current market conditions, it is challenging to ensure economic viability without reduced ESS installation costs or policy support. However, the introducing a real-time market, renewable energy bidding systems, and electricity prices linked to these systems showed potential for economic improvement. Therefore, institutional support is deemed necessary in the initial stages to promote the business. This approach is expected to contribute to enhancing social value by effectively utilize surplus power, contribute to achieving RE100, promote ESS deployment.