🔍 Read the full analysis: How 800-Volt DC Could Reshape Power Delivery In AI Data Centers on ThorstenMeyerAI.com
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TL;DR
Vantage reserved more than a gigawatt of factory capacity for a solid-state transformer designed to convert grid power directly to 800-volt DC, while a separate NiSource-Microsoft agreement includes new generation and a 600-megawatt battery. The deals point to growing interest in changing how data centers receive and manage electricity, but do not establish that 800-volt systems deliver projected savings at operating sites.
Data center operator Vantage reserved more than a gigawatt of factory capacity for a solid-state transformer designed to convert grid electricity directly to 800-volt direct current, according to the October 27 report by ThorstenMeyerAI.com. The reservation, alongside a separate power agreement between NiSource and Microsoft, highlights how operators are seeking more power and considering new electrical designs as AI racks grow increasingly demanding.
The Vantage reservation was reported on October 21. The transformer, made by Heron Power, is designed to convert grid power to 800-volt DC and includes battery storage to help manage changes in demand. The source does not say when the reserved capacity will be delivered, how many facilities will use the equipment, or whether the reservation guarantees purchases.
On October 16, Indiana utility NiSource signed a 20-year power agreement with Microsoft, according to the source. The deal adds about 1,100 megawatts of generation and a 600-megawatt battery. It is a separate development from Vantage’s transformer reservation; the source does not say that the NiSource project will use 800-volt DC.
An October 26 Utility Dive article raised the broader question of whether legacy power distribution designs suit data centers with very high rack demands. That article was sponsored content by inverter maker SMA America. Its modeled comparison and the efficiency and copper figures cited from NVIDIA are industry or vendor claims, not independent measurements at operating data centers.
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).
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Power Delivery at Megawatt Scale
The case for changing distribution starts with the growing power density of AI servers. The International Energy Agency (IEA) says it rose 11-fold from 2020 to 2025 and is projected to quadruple again by 2027. In the IEA’s account, a single rack could then draw as much power at peak as 65 households. That outlook puts pressure on equipment and electrical layouts designed for far lower rack loads.
Today, many facilities receive alternating current (AC), convert it through several stages, then convert it to low-voltage DC inside servers. Each conversion loses some energy, much of which becomes heat. NVIDIA proposes converting grid power to 800-volt DC near the facility boundary and distributing DC to high-demand racks. It says the approach could use 45% less copper than 415-volt AC distribution and deliver up to 5% better end-to-end efficiency than current 54-volt systems. Those are NVIDIA’s projections; the source provides no independent site results confirming them.
Access to electricity may be as important as the design of a facility’s internal power system. The source cites IEA estimates that transformers can take two to three years to arrive and grid connections five to ten years in many locations. A more efficient distribution design could help operators use available power, but it cannot by itself create generation or speed up a utility connection.
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From AC Conversions to DC Racks
Data centers have traditionally used AC distribution, with transformers, uninterruptible power supplies and other equipment converting electricity before it reaches server components. At lower rack demands, that architecture has served operators for years. At higher loads, the power equipment and conductors take up more space and the energy lost in conversion becomes more consequential.
NVIDIA’s reference design targets 1-megawatt racks and calls for converting 13.8-kilovolt grid power to 800-volt DC at the facility perimeter. NVIDIA says feeding a 1-megawatt rack at 54 volts could require up to 200 kilograms of copper busbar. It plans full-scale production with its Kyber systems in 2027. The timeline and performance figures are company statements, not evidence that the systems are already deployed at scale.
For existing buildings, SMA describes a “sidecar” conversion cabinet that could connect 800-volt racks to halls originally built around AC distribution. Its sponsored white-paper model estimates losses of about 80 kilowatts when delivering 1 megawatt through a traditional AC chain, compared with about 20 kilowatts for a medium-voltage AC-to-800-volt DC arrangement. These are modeled figures from a vendor-sponsored source, not reported measurements from a named operating facility.
““leaving no room for compute””
— NVIDIA, in its 800 VDC technical blog
Deployment and Savings Remain Unclear
The available information does not establish how much of Vantage’s reserved transformer capacity will be installed, where it will be used, or when it will become operational. The NiSource-Microsoft agreement is a long-term power arrangement, but the source gives no project schedule, ownership details for the generation and battery, or explanation of how the battery will be dispatched.
It is also not yet clear how 800-volt DC systems will perform across real-world data centers, how much retrofitting existing buildings would require, or whether projected reductions in copper, energy losses and maintenance costs will be achieved. The source reports no independent operational comparison of 800-volt facilities with conventional AC designs. Battery benefits will depend on factors including system design, operating needs and utility arrangements.
Electricity costs for households are a related concern, but the source does not establish that either deal will directly raise or lower residential bills. Who pays for new generation and grid infrastructure depends on the terms of projects and utility arrangements; the effect on customers remains specific to each case.
Projects and 2027 Designs Ahead
Near-term indicators include further details on the Heron Power equipment delivery and deployment plans, as well as milestones for the NiSource-Microsoft generation and battery projects. The source does not give dates for those steps. Operators and utilities will also need to determine how new facilities connect to the grid and how storage is used in day-to-day operations.
NVIDIA has said full-scale production of its 800-volt reference design is planned with Kyber systems in 2027. Independent operating data, once available, will be needed to test vendor claims about efficiency, copper use and maintenance. Until then, the reported reservations and contracts show commitments to power capacity and equipment planning, not proof that 800-volt DC has become the standard for AI data centers.
Key Questions
What happened with Vantage and Heron Power?
Vantage reserved more than a gigawatt of factory capacity for Heron Power solid-state transformers designed to convert grid electricity directly to 800-volt DC. The report does not specify delivery dates or facility deployments.
Does the NiSource-Microsoft deal use 800-volt DC?
The reported deal adds about 1,100 megawatts of generation and a 600-megawatt battery under a 20-year agreement. The source does not say that the project uses 800-volt DC, so it should be treated as a separate power-supply development.
Why are data centers considering 800-volt DC?
Higher rack power demands can require more conductors and power equipment. Converting to higher-voltage DC for distribution may reduce some conversion losses and copper requirements, but the cited performance benefits are vendor claims and have not been independently demonstrated in the source.
Will data center batteries lower electricity bills?
The source does not establish that. Batteries may help manage changing loads or support grid operations, but their effects on electricity prices depend on how they are operated and how project and utility costs are allocated.
Source: ThorstenMeyerAI.com
