ON.energy Says Medium-Voltage AI UPS Can Stabilize Gigawatt Data Centers
ON.energy says medium-voltage, inline UPS systems can shield AI campuses and grids from gigawatt load swings, while speeding permits and earning revenue.
Summary
A July 22, 2026 transmission fault in Ashburn, Virginia, disconnected more than 3 gigawatts within seconds. In 2024, one failed surge arrester simultaneously dropped about 60 Virginia facilities and 1,500 megawatts. AI campuses can swing 70% of their load in milliseconds, then disconnect to protect billions of dollars in computing equipment. Legacy UPS batteries provide only minutes of backup, often run bypassed in eco-mode, cannot filter sub-millisecond transients, and use protection designed when 50 megawatts counted as a large load. During the 2024 event, many systems disconnected after counting a third voltage dip, functioning as designed but worsening the disruption.
ON.energy proposes moving UPS equipment from 480 volts to medium voltage of 13.8 kilovolts or higher, relocating it from data halls to modular enclosures near substations, and routing every electron through it continuously. The company says this architecture smooths GPU load swings, isolates computing equipment from faults, lets utilities certify one box, avoids new interconnection studies after chip upgrades, shortens permitting by months, and frees UPS rooms for computing or cooling. Outdoor systems with integrated storage may qualify for tax credits and earn peak-shaving or demand-response revenue. In early 2026, ON.energy tested a full-scale system at the U.S. Department of Energy's National Laboratory of the Rockies, applying AI-scale loads and grid faults, including zero voltage, in one loop. It says both sides remained stable and exceeded Electric Reliability Council of Texas large-load voltage ride-through requirements. ON.energy calls the design a medium-voltage AI UPS and says new AI factories are being built with it.
Positives
- More than 3 gigawatts of volatile AI load could be smoothed through continuously operating medium-voltage equipment rather than exposed directly to the grid.
- Early 2026 testing reportedly maintained computing and grid stability through AI-scale swings and a full zero-voltage event.
- ERCOT large-load voltage ride-through requirements were cleared with capacity to spare, according to ON.energy.
- One certifiable medium-voltage box could remove months from permitting and avoid repeat interconnection studies after chip upgrades.
- Former UPS rooms could become computing or cooling space, while tax credits and grid-service revenue improve backup-power economics.
Risks & concerns
- A July 22, 2026 Ashburn transmission fault disconnected more than 3 gigawatts of load within seconds.
- One failed surge arrester in 2024 dropped about 60 Virginia facilities and 1,500 megawatts simultaneously.
- AI campuses can swing 70% of their load in milliseconds, creating synchronized disturbances at gigawatt scale.
- Legacy UPS systems often bypass filtering, exposing racks and grids to load swings and sub-millisecond transients.
- Protection designed around 50-megawatt loads can disconnect entire facilities during upstream faults, potentially amplifying grid instability.