How Solid-State Transformers Could Help Power the AI Boom
New technology could cut power losses and reinvent a staple of the grid.
By Casey Crownhart
October 27, 2026
Data centers powering the AI boom are straining the electrical grid—and one of the oldest, most fundamental pieces of grid infrastructure may hold part of the answer. Solid-state transformers (SSTs), which replace the bulky iron-and-copper magnetic transformers that have dominated power distribution for over a century, could help deliver more power more efficiently to the facilities driving the AI revolution.
The Problem With Traditional Transformers
Conventional transformers rely on electromagnetic induction to step voltage up or down between transmission and distribution lines. They are robust, inexpensive, and remarkably reliable—but they are also heavy, passive, and offer limited control over power quality. As AI data centers grow to gigawatt-scale campuses with fluctuating, extremely high-demand loads, those limitations become increasingly consequential.
How Solid-State Transformers Work
Solid-state transformers use power electronics—semiconductor switches, high-frequency magnetic components, and digital control systems—to convert and regulate voltage. Instead of a single low-frequency magnetic core, SSTs typically convert AC power to high-frequency AC or DC, pass it through a compact high-frequency transformer, and then reconvert it to the required output.
The result is a device that is dramatically smaller and lighter than a conventional transformer of equivalent rating, while offering precise, real-time control over voltage, current, and power quality. That control capability is especially valuable for modern data centers, which increasingly rely on DC power distribution (such as 800 V DC architectures) to reduce conversion losses.
Why It Matters for AI Infrastructure
AI workloads are pushing data center power density to unprecedented levels. Several trends make SSTs attractive:
- Efficiency: SSTs can reduce conversion losses through fewer energy-conversion stages and higher-frequency operation.
- Compactness: Smaller footprints free up valuable space in dense urban and campus environments where land and buildings are at a premium.
- Power quality and control: Digital control enables active management of harmonics, voltage regulation, and bidirectional power flow—useful for integrating on-site generation and storage.
- DC-native operation: SSTs can directly interface with DC distribution systems, aligning with the industry's shift toward DC power for servers and GPUs.
Challenges and the Road Ahead
Solid-state transformers remain more expensive and less mature than conventional units. Reliability at medium-voltage levels, thermal management, and the availability of high-voltage semiconductor devices are all active areas of development. Standards and certification pathways for grid-connected power electronics are still evolving.
Still, momentum is building. Utilities, equipment manufacturers, and data center operators are increasingly exploring SSTs and related power-electronics-based grid technologies as part of broader efforts to modernize the grid for high-density, AI-driven loads. If costs continue to fall and reliability improves, solid-state transformers could shift from a niche technology to a foundational component of the next-generation power grid.
Image: Sarah Rogers/MIT Technology Review | Getty Images