Key Takeaways

  • DG Matrix and Heron Power have closed venture rounds to scale solid state transformer manufacturing.
  • Startups are targeting data centers first, then the wider electrical grid as aging infrastructure drives demand.
  • Solid state transformers offer multi‑functionality, software control, and bidirectional power flow but still carry a cost premium.

The push to modernize one of the most overlooked pieces of the electrical grid is accelerating, and investors appear ready to bankroll it. DG Matrix and Heron Power, two companies building solid state transformers (SSTs), have raised new funding to expand production capacity at a moment when demand for more flexible, software‑driven power hardware is starting to spike.

The timing is significant. Transformers, the copper and iron boxes that step electricity up or down across the grid, remain rooted in a century‑old design that has barely evolved since the early days of electric power. While they work reliably and efficiently, they are almost entirely passive, unable to sense or respond to grid disturbances. In a world of volatile loads, rooftop solar, and rising data center consumption, that passivity is becoming a operational constraint.

DG Matrix raised a Series A round, while Heron Power has also secured significant capital to advance its technology. Amperesand, another startup in the sector, has similarly attracted investor attention, underscoring the momentum in the space. The cluster of deals suggests investors see a looming hardware bottleneck as data centers, especially those serving AI workloads, scale at breakneck speed. It also suggests confidence that solid state transformers, long discussed in academic labs, are finally ready for commercial deployment.

Traditional transformers rely on electromagnetic induction through copper windings around an iron core. They can change voltage effectively, but they do almost nothing else. They cannot integrate multiple power sources in one device, cannot export power in the opposite direction, and cannot be updated via software. They also rely heavily on commodities like copper and oil, both of which are vulnerable to price swings. This lack of adaptability has exposed utilities to operational challenges during various supply crunches over the past decade.

Solid state transformers replace the windings with semiconductor switches built from silicon carbide or gallium nitride. The core typically includes three key elements: a rectifier for converting AC to DC, a DC converter to change voltages, and an inverter to turn DC back to AC. Because the components are electronic, these devices can manage power flow in either direction and blend electricity from sources like batteries, rooftop solar, and grid‑scale installations.

That flexibility is a major reason data centers are the first proving ground. Operators require finer control over load distribution inside their facilities, and solid state transformers can shrink the long chain of equipment needed for backup power. They can also simplify behind‑the‑meter energy projects, where dedicated solar or storage assets feed the facility directly. In some configurations, coupling transformers with grid‑scale batteries can even eliminate the need for traditional uninterruptible power supply systems, freeing up valuable floor space for additional servers.

The companies moving into this space are carving out their specializations. DG Matrix is focused on its Interport system, designed to route power from multiple sources to multiple loads operating at different voltages. Heron Power is concentrating on medium‑voltage transformation and offers products capable of supporting data center racks for brief periods while generators spin up. That capability is significant when considering the volume of conventional hardware it replaces. At solar farms, Heron Power's equipment can perform the jobs of both inverter and transformer at roughly the same price point as traditional hardware.

Still, adoption is not happening everywhere at once. The cost premium over conventional transformers remains significant. Large transmission‑level transformers, which anchor substation yards, are not likely to see rapid replacement. Utilities tend to be conservative about system‑critical equipment, and procurement cycles can stretch into decades.

Even so, aging infrastructure is creating pressure for alternatives. According to researchers at the National Renewable Energy Laboratory (NREL), a significant portion of installed transformers in the United States are several decades old, with many nearing the end of their operational lifespan. Rising loads from EV charging, commercial electrification, and AI‑driven data centers are compounding the challenge. Analysts expect the total power flowing through grid transformers to rise significantly by 2050, a shift that cannot be handled simply by installing more iron cores and copper coils.

One question utilities are quietly asking is whether smarter hardware could help them push more electricity through existing lines. Because legacy transformers are passive, utilities build their distribution networks with substantial spare capacity as a buffer. Solid state transformers, with their monitoring and rapid response capabilities, might reduce the amount of overbuilding required. Grid planners are rarely quick to overhaul their philosophies, but the economics may eventually force the issue.

There is a subtle but important narrative playing out regarding materials. Power semiconductor prices tend to fall over time, while materials like steel and copper often trend upward. The longer that divergence persists, the more attractive solid state options become, especially for sectors that value modular flexibility and precise controllability.

Whether this becomes a broad utility‑grade transition or remains concentrated in data center architectures is still an open question. Markets like EV charging hubs could act as intermediaries since they require fast responsiveness and handle large swings in load. For now, the influx of capital suggests that the companies building these systems will have room to test multiple pathways.

Investors may be betting that once solid state transformers prove they can reliably replace clusters of equipment in mission‑critical environments, the larger grid will start adopting them in pockets. Not everywhere, and not quickly, but perhaps more than industry veterans expect. After all, infrastructure rarely changes until it has to, and many of the signs, from aging fleets to rising demands, point to a moment where change is becoming inevitable.