🔍 Read the full analysis: Why Data Centers Are Exploring 800-Volt DC For AI Workloads on ThorstenMeyerAI.com
Get the latest gadgets delivered free with Prime
- Fast, free delivery on millions of items
- Prime Video, Amazon Music and more included
- Member-only deals all year
TL;DR
Vantage reserved more than 1 gigawatt of factory capacity for a solid-state transformer designed to convert grid power directly to 800-volt DC. The move reflects growing interest in DC distribution and batteries as AI racks demand more power, but efficiency and cost savings cited by equipment makers remain vendor claims, not independent measurements.
Data center operator Vantage reserved more than a gigawatt of factory capacity on October 21 for a solid-state transformer that converts grid power directly to 800-volt direct current (DC). The reservation points to growing industry interest in redesigning power delivery for AI facilities, where increasingly dense racks strain conventional electrical systems, as explored in the power bottleneck facing AI data centers.
The development comes as AI systems raise the amount of electricity needed in a compact space. The International Energy Agency (IEA) says the power density of AI servers rose 11-fold from 2020 to 2025 and is projected to quadruple again by 2027. Under that projection, one rack could have peak demand comparable to 65 households. These figures describe peak rack demand, not average household electricity use over a year.
In a May 2025 technical blog, updated in July that year, NVIDIA proposed converting 13.8-kilovolt grid power to 800-volt DC near the edge of a facility, then distributing DC to high-power racks. The company says its design could use 45% less copper than 415-volt AC distribution and improve end-to-end efficiency by up to 5% compared with current 54-volt systems. Those are NVIDIA’s engineering estimates, not independently verified results. The company has said full-scale production is planned with Kyber systems in 2027.
A separate power deal illustrates the infrastructure being assembled around data centers facing power constraints. On October 16, Indiana utility NiSource signed a 20-year agreement with Microsoft that adds about 1,100 megawatts of generation and a 600-megawatt battery. That agreement is not itself an 800-volt DC project; it shows how new generation and storage are being tied to large data center power needs.
Infographic 01 · From grid to rack
AI racks near a megawatt are outgrowing the AC power chain.
Why the industry is moving to 800-volt direct current: fewer conversions, less copper, batteries on the main path. The numbers are vendor figures with different baselines, so they cannot be added up.
Today: many conversions
Typical AC chain from the grid to the rack
- Medium-voltage AC from the grid
- Transformer steps it down to low-voltage AC
- UPS converts to DC for the batteries and back to AC
- Distribution units feed the racks
- Every server power supply converts AC to DC again
Each stage loses energy, and almost all of the loss becomes heat the cooling system must remove.
800 V DC: convert once, outside
NVIDIA reference design, full-scale production planned with Kyber racks in 2027
- 13.8 kV AC from the grid
- Converted once to 800 V DC at the edge of the site, batteries on the same DC bus
- 800 V DC busway to the racks
- Stepped down inside the rack, for 1 MW racks and beyond
Bridge for existing halls: a “sidecar” cabinet next to the rack converts AC to 800 V DC, while the old chain stays in place.
Power lost per MW delivered to the rack
kW, SMA white-paper model vendor model
What NVIDIA says 800 V DC changes
NVIDIA’s engineering claims claim
Sources: NVIDIA technical blog (20 May 2025, updated 31 Jul 2025); SMA America, sponsored content in Utility Dive (26 Oct 2026). Rack density: IEA, Key Questions on Energy and AI (Apr 2026) (AI server power density 11× from 2020 to 2025, a further 4× by 2027).
Powered by Thorsten Meyer AI
Power Delivery Is the New Constraint
Moving to higher-voltage DC is intended to reduce the number of power conversions between the grid and AI servers. Each conversion loses some energy as heat, which then adds to the cooling load. At the same time, sending large amounts of power at low voltage requires substantial conductors and equipment. NVIDIA says a one-megawatt rack supplied at 54 volts could require up to 200 kilograms of copper busbar in its design analysis. Higher-voltage distribution may ease those physical constraints, but actual savings depend on a facility’s equipment, layout, and operating conditions.
The larger issue is whether electricity can reach proposed campuses at all. The IEA estimates that transformers can take two to three years to arrive and grid connections can take five to ten years in some places. Berkeley Lab reported about 2,300 gigawatts of proposed generation and storage in US interconnection queues at the end of 2024; only 13% of projects in earlier requests were ultimately built. A new electrical design cannot by itself create transmission capacity or shorten every connection queue.
These choices also matter beyond data center operators. US households paid an average 18.21 cents per kilowatt-hour in 2026, compared with 17.30 cents in 2025, according to the source material’s EIA figures. The reported 41% rise in wholesale prices in the PJM region concerns a regional market, not every household’s bill. How new generation, grid upgrades, and storage costs are assigned varies by contract and regulation, so the effect on customers will not be uniform.
Products Worth Considering
Bose QuietComfort Wireless Bluetooth Headphones with Active Noise Cancellation, Mic, USB‑C Charging, Deep Bass, 24‑Hour Battery – White Smok
Jackery HomePower 1000 Plus v2 Portable Power Station
Samsung 27-inch Odyssey OLED G6 QD-OLED QHD Gaming Monitor
As an affiliate, we earn on qualifying purchases.
From Server Power to Campus Power
Conventional data centers typically receive alternating current (AC), step it down through transformers, and route it through uninterruptible power supplies and distribution equipment. Power is converted to low-voltage DC before it reaches server components. An 800-volt design moves a DC conversion point closer to the facility’s power intake and distributes higher-voltage DC toward the racks. It is a change to the electrical path, not a change to how AI processors calculate.
The scale of electricity demand helps explain the attention. The IEA projects global data center electricity use will rise from 485 terawatt-hours in 2025 to 950 terawatt-hours in 2030, roughly doubling. Berkeley Lab estimated US data centers used 4.4% of national electricity in 2023 and could account for 6.7% to 12% by 2028. These are projections and estimates with different geographic and time frames; they should not be treated as a single forecast.
Operators may adopt DC in stages rather than rebuild every hall. Utility Dive’s October 26 article, sponsored by inverter maker SMA America, describes a “sidecar” conversion cabinet that could let 800-volt racks operate in buildings designed around AC. SMA’s white-paper model estimates losses of about 80 kilowatts in a traditional one-megawatt AC chain and about 20 kilowatts with its proposed DC arrangement. Those figures are a vendor-sponsored model, not a published independent test.
“NVIDIA says its 800-volt design could use 45% less copper than 415-volt AC distribution.”
— NVIDIA
Savings and Grid Effects Remain Open
There is not yet enough information in the cited material to establish how much 800-volt DC will save across operating data centers. NVIDIA’s efficiency and copper figures are vendor claims, while SMA’s loss comparison is a sponsored model. Independent measurements across different facility designs, including conversion losses, cooling needs, maintenance, and equipment costs, are not provided.
The details of Vantage’s reservation are also limited: the source material does not specify the transformer’s delivery schedule, the number of facilities it will serve, or the terms of the factory-capacity arrangement. It is not clear how much of the NiSource-Microsoft agreement’s added generation and battery will serve particular data center loads, or how costs will be allocated among the utility, Microsoft, and other customers.
Battery forecasts are similarly not guarantees. The IEA says data centers could have 20 to 25 gigawatts of batteries by 2030 and may become a grid asset if incentives support that role. The projection does not establish how much storage will be installed, where it will be located, or whether it will routinely support the wider grid rather than primarily serve facility operations.
Deployment and Grid Deals to Watch
The next practical test is whether planned hardware reaches operating sites and performs as its developers expect. NVIDIA has identified 2027 as the target for full-scale production of its 800-volt design with Kyber systems. The source material does not give a commissioning date for Vantage’s transformer capacity, so the reservation should be treated as a supply commitment rather than evidence that a gigawatt of equipment is already operating.
Operators, utilities, and regulators will also have to settle how new generation, batteries, and grid upgrades are financed. Future project announcements and utility filings may clarify which customers bear those costs and how storage is used during demand spikes or grid disturbances. Until independent performance data and project-level cost details are available, the case for 800-volt DC rests on a combination of rising rack power needs, engineering projections, and vendor estimates.
Key Questions
What does 800-volt DC mean for a data center?
It means distributing direct current at 800 volts through part of a facility’s power system, rather than relying on the conventional sequence of AC distribution and lower-voltage conversion. The aim is to deliver high power to dense AI racks with fewer conversion steps and less bulky conductors.
Has Vantage installed a gigawatt of 800-volt equipment?
No. The reported development is a reservation of more than a gigawatt of factory capacity for a solid-state transformer. The source material does not say that the equipment has been delivered or installed.
Are the projected efficiency and copper savings independently verified?
Not in the cited material. NVIDIA’s estimates and SMA’s modeled loss figures are vendor claims or vendor-sponsored analysis; independent operating results are not provided.
How does battery storage fit into the design?
Batteries store and supply DC power, so they can be integrated into a DC power path. They may help manage rapid changes in AI demand or provide backup, but the exact role depends on a site’s system design and operating arrangements.
Will these projects raise household electricity bills?
The effect is not established by the deals alone. Costs depend on local grid upgrades, contracts, regulation, and cost allocation. The source material reports rising US average household rates and higher wholesale prices in PJM, but those figures do not show that these particular projects caused the increases.
Source: ThorstenMeyerAI.com
