KEPCO launches ₩32.4bn Naju ESS tender, sparking fears of price competition
한국전력공사 (KEPCO) has issued a tender for a ₩32.4 billion, 56 MW grid-stabilization Energy Storage System (ESS) project in Naju, with completion targeted for December 31, 2027.
Our take
How will KEPCO's Naju ESS tender impact profitability and competition in Korea's DER market?
The Korean government, through KEPCO, is tightening long-term performance accountability for ESS operators by mandating a 10-year performance guarantee and annual evaluations, while simultaneously lowering some entry barriers for new participants in the ₩32.4 billion Naju ESS project.
KEPCO's revised tender conditions for the Naju ESS project reflect a dual strategy: on one hand, it seeks to enhance grid reliability and long-term asset performance by imposing stricter guarantees and evaluation criteria on suppliers. On the other hand, by easing certain technical entry requirements, KEPCO aims to foster broader competition among bidders, potentially driving down costs, but also raising industry concerns about unsustainable pricing and reduced profitability for participants.
What the source says
- KEPCO has revised contract special conditions and equipment specifications for the Naju ESS project, differing from previous Seonsan and Soryong projects.
- The latest purchase specifications, revised in May 2026, are applied to the Power Conversion System (PCS) and battery technical standards.
- Grid connection standards have been aligned with the Transmission and Distribution Electric Facilities Use Regulations.
- A 10-year performance guarantee period for batteries and annual performance evaluations have been explicitly stated.
- The tender explicitly states 'contract termination if test reports are not submitted' as a condition for negative sanctions.
- An ESS industry official noted that some verification standards have been eased, such as lowering reaction time criteria and allowing public institution test reports for on-site voltage changes, making it easier for latecomers to enter.
- The Nongong substation ESS project, originally bundled with Naju and targeting 2027 completion, is also planned for tender in September 2026.
For investors — For investors and operators, the new tender conditions mean increased long-term operational risk and financial liability due to the 10-year performance guarantee and annual evaluations, requiring more robust financial modeling and risk management strategies for bids.
Watch: Monitoring the final bid prices and awarded contracts for the Naju and Nongong ESS projects, as well as any subsequent industry statements regarding profitability.
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