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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, according to an October 21 report. The move reflects a broader shift as AI data center demand strains conventional power systems, but performance gains cited by equipment makers remain vendor claims and grid access is still a major constraint.
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 a report dated October 27. The reservation, together with a separate power deal between Microsoft and Indiana utility NiSource, highlights how AI expansion is driving investment in electricity supply, storage and new data center power systems.
The Vantage reservation was reported on October 21. The source material identifies the transformer as a product from Heron Power, with energy storage built in to buffer swings in data center demand. It does not give the reservation’s contract terms, delivery schedule or the amount of equipment Vantage will ultimately install. Reserved factory capacity is not the same as completed equipment or operating power capacity.
On October 16, NiSource signed a 20-year power agreement with Microsoft, according to the source. The deal adds about 1,100 megawatts of generation and includes a 600-megawatt battery. The material does not specify the generation technology, project locations, construction timetable or how costs will be allocated among the companies and utility customers.
The 800-volt approach addresses a practical problem as rack power rises. NVIDIA’s reference design converts 13.8-kilovolt grid power to 800-volt DC near the facility perimeter, then distributes DC to high-power racks. NVIDIA 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 figures are company claims, not independent measurements; full-scale production with its Kyber systems is planned for 2027.
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 Systems Must Catch Up
AI data centers are increasing both the total electricity they require and the amount concentrated in individual racks. The International Energy Agency (IEA) estimates global data center electricity use could rise from 485 terawatt-hours in 2025 to 950 terawatt-hours in 2030, roughly 3% of global demand. It also reports that AI server power density rose 11-fold between 2020 and 2025 and is set to quadruple again by 2027. These projections help explain why operators are considering designs beyond the conventional power chain.
Higher-voltage DC could reduce the amount of copper and the number of conversion steps needed to supply dense racks, while batteries may help manage rapid changes in demand. But the potential savings are not established outcomes for every facility: results depend on design, equipment and operating conditions. The practical bottleneck may also be the electricity connection itself. The IEA says transformers can take two to three years to arrive, while grid connections can take five to 10 years in many places.
The build-out has implications beyond data center operators. New generation, transmission equipment and batteries require investment, and the distribution of those costs can affect electricity customers. The source material says US household electricity averages 18.21 cents per kilowatt-hour in 2026, compared with 17.30 cents in 2025, and reports a 41% rise in wholesale prices in the PJM region. Those figures alone do not establish that data centers caused the increases; the source provides no causal breakdown.
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From Server Racks to Grid Capacity
Traditional data centers generally receive alternating current, step it down through transformers and power equipment, and convert it to low-voltage DC inside servers. Each conversion loses some energy, much of which becomes heat that cooling systems must remove. That arrangement was designed for lower rack loads than the megawatt-scale systems now being planned.
NVIDIA says supplying a one-megawatt rack at 54 volts could require up to 200 kilograms of copper busbar, while power shelves could occupy as many as 64 rack units in its next-generation design. These are figures from the company’s engineering material, not an independent assessment. A Utility Dive article dated October 26 describes another possible path: a “sidecar” conversion cabinet that lets 800-volt racks operate in existing AC data halls. The article is sponsored content from inverter maker SMA America, and its modeled efficiency comparisons should be read as the company’s case, not as independent results.
The supply challenge extends to the wider grid. Berkeley Lab data cited in the source put US grid interconnection requests at about 2,300 gigawatts at the end of 2024; only 13% of earlier requests were eventually built. A queue represents proposed projects, not guaranteed construction. Together, the figures show why new equipment orders and power contracts do not by themselves establish that a data center can connect on schedule.
““leaving no room for compute””
— NVIDIA, in its 800 VDC technical material
Costs, Timelines and Real-World Gains
The available information does not say when the Vantage-reserved transformer capacity will translate into delivered equipment, or how much of it Vantage plans to use. Nor does it provide the detailed construction and cost terms of the NiSource-Microsoft agreement, including who will pay for generation, storage and any grid upgrades.
Efficiency, copper-use and maintenance figures for 800-volt systems come from NVIDIA or SMA, whose Utility Dive material is sponsored content. Independent operating results were not provided. It is also unclear how quickly operators will adopt direct-DC systems, how widely sidecar conversions will be used, or whether battery installations will receive the incentives needed to support grid operations.
Electricity price changes and rising data center demand are both reported, but the source does not establish how much data centers contributed to household bills or regional wholesale prices. The scale and timing of that effect will vary by location, grid capacity, utility planning and the terms of individual projects.
Watch for Deliveries and Grid Approvals
The next indicators are whether Heron Power delivers equipment against the capacity reserved for Vantage, and whether the projects attached to NiSource’s Microsoft agreement advance through planning and construction. The source gives no confirmed delivery dates for the Vantage reservation or construction milestones for the utility deal.
For the broader shift, watch for operating data from 800-volt deployments, including measured efficiency, reliability and maintenance results against existing systems. NVIDIA has said full-scale production with Kyber systems is planned for 2027. Grid connection approvals, transformer lead times and decisions about who funds related infrastructure will also determine how quickly announced capacity can become electricity available to data centers.
Key Questions
What did Vantage reserve?
According to the October 27 report, Vantage reserved more than a gigawatt of factory capacity for a solid-state transformer intended to convert grid power directly to 800-volt DC. The report does not say how much equipment will be delivered or when.
Why are data centers considering 800-volt DC?
Higher-voltage DC can carry more power through a given conductor size than lower-voltage systems, potentially reducing copper use and conversion losses in high-density facilities. Specific savings cited by NVIDIA and SMA are vendor claims or modeled estimates, not independent measurements in the supplied material.
What is included in the Microsoft-NiSource agreement?
The reported 20-year agreement adds about 1,100 megawatts of generation and includes a 600-megawatt battery. The source does not state the generation technology, project timetable or cost allocation.
Will these projects raise household electricity bills?
The source reports higher average US household electricity prices in 2026 than in 2025, but it does not establish that data centers caused the increase. The impact of new power projects on customers depends on local grid conditions and how project and infrastructure costs are assigned.
When might 800-volt data center systems be deployed?
NVIDIA has said full-scale production with its Kyber systems is planned for 2027. That is a company plan, not confirmation that all operators or the Vantage project will use the systems by then.
Source: ThorstenMeyerAI.com
