Data Center Power
The constraint on AI data centers is no longer chips but power infrastructure. We read the move to 800 VDC for 1 MW racks, GaN/SiC adoption, and the transformer / grid-interconnection bottleneck through primary sources such as NVIDIA, OCP and EPRI.
As the AI data center bottleneck shifts from semiconductors to power infrastructure, this report maps the move to 800V DC delivery for 1 MW racks, GaN/SiC adoption, power-cooling integration, and the triple wall of transformers, grid interconnection, and regulation — all from primary sources. It covers a supplier player map with product comparisons, three-scenario market sizing, implications for Japanese companies, role-based playbooks for investment/procurement/design, risks with leading indicators, and case studies across 13 chapters plus an appendix (based on public information from NVIDIA, OCP, EPRI, NERC, DOE, and others).
On October 26, 2026, Infineon announced it will supply a 900V GaN monolithic bidirectional switch to Enphase. It will be used in Enphase's solid-state transformer for AI data centers under development (IQ SST, 5MW per system, 800VDC output).
On October 21, 2026, NVIDIA unveiled DSX POD, which ships a full AI factory in containers from the factory, cutting deployment from six months to as little as 14 days. The same day, Infineon announced work on GaN for 800 VDC intermediate bus converters.
According to the U.S. EIA, PJM (162.6 GW), ERCOT (91.1 GW) and SWPP (58.0 GW) set all-time hourly peak load records in summer 2026. ERCOT beat its previous record by 6.5%. EIA attributed the peaks mainly to cooling demand during record heat.
On October 6, 2026, Navitas completed its acquisition of integrated voltage regulator (IVR) developer Claros for about $232.8 million, including about $126.4 million in cash. It expects its identified 2030 SAM to more than double to over $8 billion. Infineon closed C2i the same week.
On October 8, 2026, Infineon unveiled a 27 kW three-phase PSU reference design for AI servers. It meets OCP ORV3, exceeds 98% peak efficiency and reaches 116 W/in³ (minimum 94 W/in³). 20 ms hold-up removes the need for a separate capacitor bank.
On September 29, 2026, Delta Electronics unveiled an AI modular data center for NVIDIA Vera Rubin. Its 800 VDC in-row power unit delivers 660 kW, up to 98% AC-DC efficiency and 480 kW BBU. It also showed an SST microgrid converting MV to 800 VDC.
In a September 2026 report, the IEA estimated that dynamic ratings and two other technologies could connect up to 330 GW to existing grids without reinforcement, worth about USD 100bn of expansion. The barriers are regulatory and organisational.
China's 2026-2030 digital-green plan names 800V high-voltage DC architecture for computing infrastructure and deployment of racks above 100kW.
Flex agreed on September 3, 2026 to buy EPC Power for $4.4 billion, adding 800V DC data-center architecture with rectifiers and solid-state transformers.
Executive Order 14420, signed August 26, 2026, declares a bulk-power emergency citing AI and data-center demand; transmission-level equipment is in scope.
Amazon may convert self-generation at its 8,000-acre GW Ranch AI campus in Texas to front-of-meter grid service; permits describe 5,000MW across 35 units.
How PJM plans to connect AI data centers: a January 2026 integration plan, a February 27 FERC filing, bring-your-own-generation and an expedited track.
NVIDIA's 800VDC rollout timeline: Vertiv ships products in H2 2026, Foxconn leads deployment at its Kaohsiung K-1 site, and Kyber racks ship in 2027.
DOE's draft 2026 Transmission Needs Study names data centers as a key constraint: US data-center use may rise from 176TWh in 2023 to 325-580TWh by 2028.
AI compute is limited by power, not FLOPS: TOP500 leader LineShine reaches 2.198 EF at 42.2 MW, while Microsoft Fairwater points to distributed superfactories.
New York paused state permits for hyperscale data centers above 50MW for up to a year on July 14, 2026, with about 12GW queued at NYISO.
Liquid cooling operational requirements: TCS loop pressure of 140-450kPa, ASHRAE coolant classes W1-W5, IEC 62368-1 leak testing, and sensor needs.
NERC treats data centers, crypto and electrolysis as a reliability problem of their own, with 50MW swings in 250ms and standards due by end-2026.
FERC issued a large-load interconnection ANOPR in October 2025 and plans action by June 2026; PJM summer peak is projected to rise 70GW in 15 years.
OCP is standardizing data-center liquid cooling - cold plates, CDU, UQD connectors, coolants - with NVIDIA, Meta, Dell, and Intel involved.
PUE and WUE definitions from The Green Grid and how to read them, plus Partial PUE, waste heat reuse, and the wider xUE family (CUE) for data centers.
800-volt DC (800 V DC) server racks compared with in-rack 48 V and +/-400 V: current, conductor losses, power density, OCP direction, and sourcing risk.
Data-center transformer lead times went from about 50 weeks in 2021 to 120 weeks in 2024, with prices up 80%. What drives the wait, from primary sources.
Is 800 V DC worth it? What you gain (up to 5% end-to-end efficiency, fewer PSUs, density) against isolation, DC breaking, SiC/GaN choices and lead times.
AI data centers are adding onsite generation, BESS, and demand response as grid-only power becomes constrained.
What is direct liquid cooling (DLC), and how does it differ from immersion cooling? Direct-to-chip vs single/two-phase immersion on heat, upkeep and fit.
As high-density AI racks shift toward liquid cooling, cooling choices reshape power supplies, SiC/GaN devices, Tj margins, and efficiency.
OCP's Diablo sidecar power-rack concept moves from in-rack 48V DC to ±400/800V DC to support 100kW to 1MW AI racks.
800 V HVDC for data centers: NVIDIA's 1MW-rack roadmap, up to 5% end-to-end efficiency gain, DC protection hurdles, and supplier timing.
AI data-center bottlenecks are moving to power infrastructure. EPRI projects 9-17% of U.S. electricity by 2030 and up to 10 years to energization.
onsemi's GaNEXUS pairs 650V GaN with GlobalFoundries and 40-200V GaN with Innoscience, with H1 2026 samples for AI data-center power.
onsemi Q1 2026 and Infineon Q2 FY2026 results: AI data-center power demand expands fast while automotive applications stay in a slow recovery.
Generative-AI data centers are driving SiC/GaN UPS and PSU adoption as efficiency rules tighten. 2026 power-device demand trends and what they mean.
Rack power went from 10-15kW in 2020 to over 100kW with AI accelerators, and Blackwell pushes it further. What that does to data-center power design.
