TSMC $TSM is planning six fabs and two advanced packaging facilities in Arizona. Supplying a US fab with high-purity chemicals can require 3 to 5 times as many tanker trucks as an equivalent fab in Taiwan, according to supply-chain estimates.
In Taiwan, a truck can make several deliveries a day. In the US, some chemicals travel hundreds or thousands of kilometers, while others still arrive from Asia in ISO tanks. Federal limits on driver hours stretch each trip further.
The additional trucks and chemical inventory in transit are needed to keep the fab supplied around the clock.