Why investors are going gaga over solid-state transformers

A string of startups including DG Matrix, Heron Power, and Amperesand are developing solid-state transformer technologies that promise to replace traditional copper and iron transformers in the electrical grid, raising significant funding ($60 million, $140 million, and $80 million respectively) to scale production as the aging infrastructure struggles to meet modern demands. These innovative devices represent a fundamental shift from the passive, century-old transformer technology that has remained largely unchanged since Thomas Edison's era, offering grid operators unprecedented control over electricity flow through software-updatable, silicon-based components. Unlike traditional transformers that can only perform one task per device and react passively to grid changes, solid-state transformers incorporate power from diverse sources including traditional power plants, renewables, and batteries, converting it to various voltages of alternating or direct current in a single compact unit. The technology arrives at a critical time when most grid transformers are several decades old, with the National Laboratory of the Rockies reporting that over 50% are 35 years or older, while demand from data centers, EV chargers, and other components is projected to double power flow through transformers by 2050. For data centers, these transformers offer particular advantages, shrinking power system footprints while providing finer control over electricity distribution and the ability to integrate behind-the-meter power sources and eliminate uninterruptible power supplies when coupled with grid-scale batteries. Although solid-state transformers still command a cost premium over traditional iron-core transformers and are unlikely to immediately replace massive substation equipment, they're already making inroads in data centers and EV charging hubs where they replace multiple devices, with the potential to significantly reduce transmission and distribution costs—the largest contributors to utility bill inflation—by enabling more efficient use of existing grid infrastructure.