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TL;DR
Vantage reserved more than a gigawatt of factory capacity for a solid-state transformer designed to deliver 800-volt DC to data centers. Separately, NiSource and Microsoft agreed to a 20-year power deal adding about 1,100 MW of generation and a 600 MW battery. The developments show growing interest in new power architectures, but vendor efficiency figures and the broader cost effects remain uncertain.
Vantage reserved more than one gigawatt of factory capacity on October 21 for a solid-state transformer designed to convert grid electricity directly into 800-volt direct current, as utilities and data center operators pursue new ways to power AI workloads. The move came days after NiSource and Microsoft signed a 20-year power deal that includes about 1,100 megawatts of generation and a 600-megawatt battery.
The two agreements point to different parts of the same challenge: supplying large, fast-growing data center loads when equipment and grid connections can take years to secure. Vantage’s reservation concerns factory capacity for a transformer technology; it is not, by itself, evidence that a gigawatt of new data center capacity is already operating. The NiSource-Microsoft agreement adds generation and storage under a long-term power contract.
The 800-volt approach would change how power is distributed inside a facility. Instead of converting electricity repeatedly from alternating current to lower-voltage direct current, the proposed design converts grid power to 800-volt DC near the facility perimeter and distributes it to high-power racks. NVIDIA’s reference design targets one-megawatt racks and is planned for Kyber systems in 2027. NVIDIA says the 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 figures are vendor claims, not independent measurements.
Batteries are also being considered as part of normal power management, rather than solely as emergency backup. They could help buffer rapid changes in AI computing demand and support a site during grid disturbances. The International Energy Agency estimates that data centers could have 20–25 gigawatts of batteries by 2030, while warning that their potential value to the wider grid depends on incentives. That estimate is a projection, not a report of installed capacity.
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 Design Meets AI Rack Demand
AI racks are placing far more demand in a small physical space than conventional server layouts were built to handle. The IEA says AI server power density increased 11-fold between 2020 and 2025 and is projected to quadruple again by 2027. It estimates a rack could then draw peak power comparable to 65 households. Higher voltage can reduce the current needed to deliver a given amount of power, potentially easing the amount of copper and distribution hardware required.
The change matters to operators because power delivery, cooling and site access can constrain expansion even when computing equipment is available. The IEA estimates global data center electricity use could rise from 485 terawatt-hours in 2025 to 950 TWh in 2030. Batteries may help manage short-term fluctuations, but they do not replace the need for sufficient generation and transmission. For households, the effects depend on local electricity systems and on how the cost of new plants and grid infrastructure is assigned. There is no single nationwide outcome established by these deals.
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From AC Conversion to 800-Volt DC
Most data centers receive alternating current and convert it through several stages before servers use direct current. Each conversion loses some energy, much of which becomes heat that cooling systems must remove. Traditional designs were suited to racks drawing tens of kilowatts; the move toward much denser AI racks is prompting companies to revisit the electrical layout.
NVIDIA has described converting 13.8-kilovolt grid power to 800-volt DC near a facility’s perimeter. It says supplying a one-megawatt rack at today’s 54 volts could require up to 200 kilograms of copper busbar, while power shelves could occupy substantial rack space. The company’s planned 2027 system is a design target, not proof of broad deployment. A Utility Dive article published October 26, sponsored by inverter maker SMA America, also discussed a “sidecar” conversion cabinet that could let 800-volt racks operate in existing AC data halls. Its energy-loss comparisons come from a vendor white-paper model, not an independent field test.
Infrastructure delays add pressure. The IEA says transformers can take two to three years to arrive and grid connections can take five to ten years in many locations. Berkeley Lab reported about 2,300 gigawatts of generation and storage capacity in US interconnection queues at the end of 2024; only 13% of projects in earlier requests were ultimately built. Queue capacity is not the same as capacity certain to be constructed.
“The company says its design could use 45% less copper than 415 V AC distribution and deliver up to 5% better end-to-end efficiency than current 54 V systems.”
— NVIDIA, 800 VDC technical blog, updated July 31, 2025
Costs and Performance Still Unproven
The reported capacity reservation does not establish when Vantage’s transformer equipment will be delivered, where it will be used or how much of the reserved capacity will become operating infrastructure. The NiSource-Microsoft announcement, as described in the source material, does not specify the generation technology, project locations, construction schedule or how the battery will be dispatched.
It also remains unclear how 800-volt DC systems will perform across different data center designs and operating conditions. NVIDIA’s efficiency, copper and maintenance figures are company claims, while the SMA-sponsored comparison is a modeled case. Independent measurements from deployed facilities are not provided here. The effect on customer electricity bills is also unsettled: costs will vary by utility, region, contract terms and decisions about who pays for generation and network upgrades.
Deployment and Grid Deals to Watch
The next milestones are equipment delivery and deployment details for Vantage’s transformer reservation, and project information on the generation and battery included in the NiSource-Microsoft agreement. NVIDIA’s stated target is to bring its 800-volt design into full-scale production with Kyber systems in 2027. Operators and utilities will also need to show how storage integrates with facility power systems and whether it can respond to grid needs without compromising data center operations.
For now, the deals show companies arranging power infrastructure earlier and testing different ways to manage high-density loads. Whether 800-volt DC and batteries reduce costs or speed construction at scale will depend on real-world performance, supply availability, grid approvals and the terms governing energy investment.
Key Questions
What is the confirmed news?
Vantage reserved more than one gigawatt of factory capacity for a solid-state transformer intended to supply 800-volt DC. Separately, NiSource and Microsoft signed a 20-year agreement involving about 1,100 MW of generation and a 600 MW battery.
Does 800-volt DC mean the data center runs entirely on direct current?
No. The proposed design converts grid power near the facility and distributes 800-volt DC to high-power equipment. The source material also describes sidecar cabinets as one way to connect new DC racks to halls built around AC systems.
Are the efficiency and copper savings independently verified?
Not in the material provided. The figures for 45% less copper and up to 5% better efficiency are attributed to NVIDIA. SMA’s energy-loss comparison is a vendor-sponsored model, not an independent measurement from an operating data center.
What role could batteries play?
Batteries could buffer rapid changes in computing demand, provide short-term support during grid disturbances and potentially offer grid services. The IEA projects 20–25 GW of data center batteries by 2030; this is a forecast, and grid benefits depend on operating arrangements and incentives.
Will these projects raise household electricity bills?
The effect is not established by these agreements alone. It will depend on regional power markets, utility decisions, contract terms and how the costs of generation and grid upgrades are allocated.
Source: ThorstenMeyerAI.com
