The second round of the distribution-grid ESS installation support program will proceed in August 2026. Korea’s Ministry of Climate, Energy and Environment announced the results of round 1 on July 10, selecting 9 operators including VPP Lab, LG Energy Solution, KEPCO KDN, SK Eternix, HD Hyundai Electric, Gridwiz, Korea East-West Power, Korea Midland Power, and Hyundai Engineering & Construction. In round 1, 128MW/640MWh of ESS will be installed across 32 distribution lines, enabling early grid connection of 182.4MW of solar capacity currently waiting to connect.
Key News Facts
The government chose an approach of investing KRW 558.6 billion in national funding from 2026–2030, attaching ESS like a buffer to raise existing distribution-grid capacity without expanding the distribution lines themselves. The round-1 standard formula is that installing 4MW/20MWh of ESS per distribution line enables an additional 5.7MW of waiting solar capacity to connect. The goal is to deploy approximately 700MW of ESS by 2030, connecting an additional 1GW of renewable energy and securing an additional 1,350GWh/year (average 3.7GWh/day) of solar generation. The August round 2 covers roughly 50 mainland and 7 Jeju distribution lines, selecting around 20, and starting this round encourages market entry of next-generation batteries with long duration, long cycle life, and fire safety.
Mechanical-Design Impact Analysis
Distribution-line-attached ESS has different installation conditions from large ESS built on power-plant or substation sites. Container-type racks are often installed on narrow sites near roadsides or utility poles, making foundation load conditions and access-passage width far more constrained than for large ESS. In addition, the long-duration, long-cycle-life batteries required by this round are typically LFP-based, which tends to be heavier than nickel-based chemistry, so the increased per-rack load on the same site footprint must be reflected at the foundation-design stage. Also, since fire-safety requirements are explicitly stated, rack-to-rack spacing and firewall placement must satisfy thermal-runaway-propagation-prevention standards in addition to the pinch-point-prevention requirements under Korea’s Occupational Safety and Health Act, and the narrower the site, the greater the potential for these two requirements to conflict.
Spec Comparison Table
| Item | Round 1 (2026.7) | Round 2 (2026.8, planned) |
|---|---|---|
| Target distribution lines | 82 applied → 32 selected | ~50 mainland + 7 Jeju → ~20 selected |
| Installation scale | 128MW / 640MWh ESS | Undetermined (undisclosed) |
| Standard scale per line | 4MW / 20MWh ESS | Same standard assumed to apply (estimated) |
| Battery-type policy | No restriction | Long-duration/long-cycle-life/fire-safe batteries favored |
The per-line installation scale and exact battery-spec scoring criteria for round 2 remain undisclosed pending the official announcement, and require confirmation after field measurement.
One-line summary: Because the round-2 distribution-grid ESS program places heavy long-duration batteries on narrow sites, the key is a foundation design that simultaneously satisfies rack loading and thermal-runaway-propagation spacing within site constraints.