TSMC Commits to Five Additional Advanced Packaging Plants in Chiayi Science Park

The global ceiling on artificial intelligence compute capacity has officially been raised. Taiwan Semiconductor Manufacturing Co. (TSMC) has secured land and initiated Phase III development at the Chiayi Science Park, committing to build five additional advanced packaging facilities that will collectively form the largest Chip-on-Wafer-on-Substrate (CoWoS) hub in the world.[1][2]

While chip designers frequently announce theoretical performance leaps for next-generation silicon, the physical reality of the AI boom is dictated entirely by packaging capacity. CoWoS—the intricate process of stacking logic and high-bandwidth memory chips side-by-side on a silicon interposer—has been the industry's most severe chokepoint since 2023. TSMC's commitment to five new plants moves the needle from incremental yield improvements to a structural doubling of global output.[5]

The expansion in southern Taiwan represents a massive capital deployment. According to the Chiayi County Government, the Phase III development will span roughly 88 hectares, adding to the two CoWoS plants already under construction in the park's earlier phases. Once fully operational, the seven-plant complex is projected to output hundreds of thousands of CoWoS wafers annually, dwarfing the company's existing packaging hubs in Taichung and Tainan.[1][3]

Industry analysts at TrendForce note that this scale of expansion is a direct response to locked-in orders rather than speculative forecasting. "TSMC does not break ground on five advanced packaging facilities simultaneously without binding, multi-year capacity agreements from its largest clients," the research firm stated in a Monday briefing. Those clients—primarily Nvidia, AMD, and Broadcom—have spent the last two years rationing their highest-margin AI accelerators because TSMC simply could not package them fast enough.[4]

However, the timeline between a land acquisition announcement and volume production remains lengthy. Building the physical shells in Chiayi will take roughly 18 to 24 months, with equipment move-in and yield calibration pushing commercial output into late 2028 or early 2029. The announcement secures the long-term supply chain, but it does not immediately alleviate the 36-week lead times buyers currently face for enterprise AI hardware.[2][5]

Scaling to this magnitude also tests Taiwan's domestic infrastructure. The Chiayi Science Park expansion will require an estimated 45,000 metric tons of water per day and a dedicated substation to handle the immense power draw of advanced packaging equipment. Local officials have assured the public that the region's reservoirs and grid upgrades, subsidized by the central government, are already modeled to absorb the load without disrupting municipal supplies.[1][3]

The move further cements Taiwan's absolute dominance over the most critical node of the modern tech economy. While competitors like Intel and Samsung Foundry have aggressively marketed their own advanced packaging alternatives—such as EMIB and I-Cube—TSMC's CoWoS remains the de facto standard for high-performance computing. By concentrating this new capacity in Chiayi, TSMC is keeping its most advanced and lucrative manufacturing steps firmly on the island, even as it builds trailing-edge and standard logic fabs in the United States, Japan, and Germany.[2][4][5]

The immediate next step is environmental and regulatory clearance for the Phase III land, which the National Science and Technology Council expects to fast-track by the end of the year. If the permitting proceeds on schedule, ground clearing for the first of the five new facilities will begin in the first quarter of 2027, setting the physical foundation for the next decade of AI hardware scaling.[1][2]