AI data centres are becoming a storage market: what it means for UPS and BESS makers

#A new kind of load

AI data centres are not just large; they behave differently. Training clusters switch thousands of accelerators on and off almost simultaneously, so power draw can swing sharply within moments. At gigawatt scale, that becomes a grid problem — and the classic answer, a UPS in the data hall, was not designed for it.

Fastmarkets estimates that energy storage demand directly linked to AI data centres could reach 300 GWh by 2030. US power consumption is projected to grow 5 % in 2026, and data centres could account for up to 12 % of US electricity use by 2028.

#When data centres drop off the grid

Grid operators have a specific worry. In July 2024, a fault on a 230 kV line in Virginia triggered the simultaneous loss of about 1 500 MW of data-centre load. NERC’s review found that the load was lost at 60 points across 25 substations — not tripped by the utility but by the data centres’ own protection, which switched to backup power and stayed there until manually reconnected.

The problem has grown. A July 2026 event in Virginia was reported at 3 to 4 GW. On 4 May 2026 NERC issued a Level 3 alert — its highest level — on large computational loads, with responses due in August 2026. The direction is clear: large loads will be expected to ride through grid disturbances, much as power plants must.

#Why medium-voltage UPS is spreading

A traditional UPS sits inside the data hall at low voltage. A medium-voltage UPS sits outside, between the grid and the facility, and combines a battery energy storage system with grid-interactive controls. Developers cite three advantages:

• Ride-through. It stays online through voltage dips and spikes and keeps the load supplied, instead of disconnecting.
• Power quality. It absorbs the rapid load swings of AI training before they reach the grid.
• Space. Removing low-voltage UPS equipment and heavy copper from the building frees floor space for computing.

The battery side is shifting too. Lead-acid is losing ground in dense AI facilities, and LFP dominates new installations; Fastmarkets assessed 314 Ah prismatic LFP cells at 0.35–0.40 yuan/Wh in June 2026.

#What it changes for testing

The equipment in these projects sits between two worlds — data-centre power and grid-scale storage — and has to satisfy both:

Two points stand out. First, ride-through has to be tested as behaviour, not declared: dips of different depths and durations, recovery and repeated events. Second, efficiency matters at the operating points the system actually sees — a UPS that spends most of its life at partial load should be measured there.

TSINGHU tests UPS systems to the IEC 62040 series and storage converters up to 2.5 MW in China — performance, safety, grid behaviour and EMC — so equipment for AI data-centre projects can be verified before it goes into a tender.