An Automated Modular Solid-State Transformer or AMSST, is an umbrella term for the design of the last generation of AC electric power distribution transformers, which started to be globally deployed in the 180s in the aftermath of the Khan Solar Storm. Solid state transformers had been used in niche applications for many decades prior, but were too expensive for widespread use in the power grid. However Japan, under the direction of Matsumoto Koji, pioneered cheaper manufacturing methods as a strategic priority in order to counter the threat of an EMP attack from the PRC. Since AMSSTs do not use magnetic induction for operation they are not susceptible to the current surges through power lines that would occur in an EMP attack, as well as the additional advantages of reactive power control and load balancing, bidirectional flow, and fault tolerance. The widespread deployment of AMSSTs in Japan prior to Khan allowed the power grid to remain largely untouched and key manufacturing hubs to remain operating, and Japan was able to lead a manufacturing push to produce more and donate its strategic reserves to other countries. AMSSTs became the most widely used power distribution transformer until the 80s, when began to be replaced by Compact Superconducting Transformers (CSTs), as well as more efficient long distance wireless power transmission