The transmission gap behind Korea's $880 billion chip plan
Samsung and SK hynix pulled fab dates forward by 12 years while Korea's state utility, KEPCO, took 22 years to build a single line and now has to build hundreds of kilometers more.
Samsung and SK hynix pulled fab dates forward by 12 years while Korea's state utility, KEPCO, took 22 years to build a single line and now has to build hundreds of kilometers more.
On June 29, South Korean President Lee Jae-myung stood between Samsung Executive Chairman Lee Jae-yong and SK Group Chairman Chey Tae-won and announced a ₩1,350 trillion (~$880 billion), 10-year public-private plan for semiconductors, AI data centers, and robotics (Tom's Hardware). The figure bundles roughly $520 billion of corporate semiconductor capex with state funding for AI and robotics. Within weeks, both chairmen said their companies had moved fab completion dates forward by as much as 12 years. The state utility that has to feed those fabs electricity, Korea Electric Power Corporation (KEPCO), says its main transmission build-out to the central cluster will not finish until 2036.
KEPCO completed the Bukdangjin-Sintangjeong line, a 345 kV transmission corridor, in 2023. Site selection for the route had started in 2001. The full project ran 22 years end to end, with site selection alone running past a decade, and accumulated ~₩1.17 trillion (~$810 million) in delay costs (Tom's Hardware). Industry reads the line as the floor, not the ceiling, for how fast Korea can build a single high-voltage corridor. The build-out required for the chip hub is roughly 1,153 km of new 345 kV transmission, budgeted at ~₩37 trillion, targeted for completion in 2036 (Seoul Economic Daily). Most of the new lines will run inland, moving east-coast and Honam generation into the Gyeonggi demand cluster.
The Yongin Semiconductor National Industrial Complex, a multi-fab megaproject in Gyeonggi Province that Samsung and SK hynix are filling out together, is the load those lines have to reach. Trade-press analysis of KEPCO filings puts the cluster's full-operation electricity demand at 15 to 16 gigawatts, against roughly 1.9 GW of local supply (Tom's Hardware). As of a January MOTIE/KEPCO briefing, roughly 6 GW of the 15 the complex needs has no finalized supply plan. Samsung's contracted share is 9 GW (6 GW secured); SK hynix's is 6 GW (3 GW secured) (DigitalToday).
The same supply-side problem is starting to show up on water. The megaclusters are flagged in industry coverage as dependent on multi-source municipal and industrial supply that has not been committed at fab scale (Tom's Hardware). The southwestern semiconductor complex has been promised up to ₩20 trillion in infrastructure support and a virtually confirmed new nuclear plant to back its power load (TheLEC, Maeil Kyungjae). Whether either cluster can lock in water rights, industrial reuse, and the cooling-tower footprint at the same pace as the fab build is a question the public reporting has not yet answered.
The fab makers are not waiting for the grid. Samsung's Device Solutions division booked ₩53.7 trillion in operating profit in the first quarter of 2026 and has guided that 2026 will out-earn its entire prior semiconductor history (Tom's Hardware). That is the financial pressure pulling fab dates forward. It also turns KEPCO's 2036 transmission target from an internal planning horizon into a hard cap on the public program. If the wires do not arrive, the capex still does. The schedule Samsung and SK have committed to is being built on top of a delivery culture that has historically priced a single 22-year line at ~₩1.17 trillion in delay losses.
The next concrete test is the line-item release of the ₩20 trillion infrastructure commitment for the southwestern hub, plus the project pipeline that turns KEPCO's 1,153 km plan into named corridors and dates. The 2036 target is still a statement, not a schedule. The wires are the variable the chaebol cannot compress. On current evidence, they will decide whether the ₩1,350 trillion plan ships on the schedule its authors announced.