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TL;DR
AI data center power demand is driving interest in 800-volt direct-current distribution and batteries, alongside new deals for generation and grid equipment. Vantage reserved more than 1 GW of manufacturing capacity for Heron Power solid-state transformers, while a NiSource-Microsoft agreement adds about 1,100 MW of generation and a 600 MW battery. The deals highlight a growing constraint: getting electricity and equipment to sites, not just obtaining AI chips.
Data center operator Vantage reserved more than 1 gigawatt of factory capacity for Heron Power solid-state transformers that convert grid electricity directly into 800-volt direct current, a sign that AI infrastructure investment is shifting toward power delivery as well as chips. Separately, NiSource signed a 20-year agreement with Microsoft that adds about 1,100 megawatts of generation and a 600 MW battery, underscoring the scale of electricity resources being arranged for data centers.
The Vantage reservation, reported on October 21, is for manufacturing capacity, not a statement that more than 1 GW of transformers have already been installed or is delivering power. Heron Power’s solid-state transformer is designed to convert grid power to 800-volt DC and incorporate energy storage to buffer changes in demand. The source material does not specify how many facilities will use the equipment or when installations will begin.
The NiSource agreement with Microsoft, signed October 16, covers about 1,100 MW of generation and a 600 MW battery under a 20-year power deal. The figures describe planned resources associated with the agreement; the source does not provide a construction schedule, project locations, or the contract’s detailed cost and rate arrangements.
The engineering case for 800-volt distribution is partly based on vendor projections. NVIDIA’s reference design would convert 13.8-kilovolt grid power to 800-volt DC near a facility’s perimeter and distribute it to racks, with full-scale production planned alongside Kyber systems in 2027. NVIDIA says its approach 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 company claims, not independent measurements. A Utility Dive article published October 26 was sponsored by inverter maker SMA America; its modeled comparison estimates losses of about 80 kW in a traditional 1 MW AC chain and about 20 kW in an 800-volt DC design.
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 Is Becoming a Bottleneck
AI computing is pushing rack power well beyond the levels that conventional data center designs were built to support. The International Energy Agency says AI server power density rose 11-fold from 2020 to 2025 and is projected to quadruple again by 2027. It estimates a rack could then draw as much power at peak as 65 households. At those loads, operators must manage not only the amount of electricity but also the equipment, space, heat and conversion losses involved in bringing it to servers.
Higher-voltage DC could reduce the copper and conversion equipment needed to deliver power to dense racks, if vendor projections hold up in operating facilities. Batteries could also help manage rapid changes in AI workloads and provide power during disturbances. The IEA expects 20–25 GW of batteries in data centers by 2030, while saying they could become a grid resource if appropriate incentives are in place. These changes may affect how quickly new data centers can be built and connected.
For households, the implications are less direct and vary by region. The source cites an EIA average U.S. residential price of 18.21 cents per kilowatt-hour in 2026, compared with 17.30 cents in 2025, and says wholesale prices in the PJM region are up 41%. Those figures do not establish that data centers caused the increases. Who pays for generation, transmission and other grid upgrades depends on contracts and regulatory decisions, details not supplied for the deals described here.
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From AC Server Rooms to Dense Racks
Traditional data centers receive alternating-current power, step it down through transformers and other equipment, then convert it to low-voltage DC inside servers. Each conversion loses some energy, much of which becomes heat that cooling systems must remove. This arrangement served lower-density racks, but it becomes harder to accommodate when a rack approaches a megawatt of demand.
NVIDIA’s technical account says supplying a 1 MW rack at 54 volts could require up to 200 kilograms of copper busbar and occupy substantial rack space with power equipment. Its proposed 800-volt design moves conversion closer to the facility’s electrical boundary. The company says this could move 85% more power through the same conductor size than its stated comparison and cut copper use by 45% versus 415-volt AC distribution. These remain vendor figures; the source provides no independent, real-world comparison.
Operators may adopt the higher-voltage approach in stages. SMA describes a “sidecar” conversion cabinet that could supply 800-volt racks in existing AC data halls, without replacing every part of the existing electrical system at once. That description appears in sponsored content, so it is best understood as the company’s proposed deployment path rather than evidence of broad adoption.
“Leaving no room for compute”
— NVIDIA, in its 800 VDC technical blog
Costs, Rollout and Rate Impacts
The announced capacity reservation does not establish when Heron’s transformers will be manufactured, delivered or operating at Vantage sites. The source also does not identify which data centers or projects are covered by the reservation. NVIDIA’s 2027 production plan is a stated target, not confirmation that the design is already in widespread use.
Reported efficiency, copper and maintenance savings come from NVIDIA and SMA, and the SMA comparison comes from sponsored material. Independent operating data showing how 800-volt systems perform at full scale is not provided. The source also does not spell out how the NiSource-Microsoft generation and battery costs will be allocated, whether consumers could bear any grid-upgrade costs, or how much the projects will change local electricity prices.
Deployment and Grid Agreements
The next milestones are the development and deployment schedules for the reserved transformer capacity and the generation and battery resources in the NiSource-Microsoft agreement. NVIDIA’s stated target is full-scale production of its 800-volt design with Kyber systems in 2027. Utilities, data center operators and regulators will also have to resolve project-specific questions about grid connections, equipment delivery, permitting and who pays for infrastructure.
More information will be needed to judge whether projected efficiency and copper savings translate into lower costs in operating facilities. Until projects are built and results are reported, the announced deals show investment and planning—not proof that 800-volt distribution or batteries have resolved data centers’ power constraints.
Key Questions
What did Vantage announce?
Vantage reserved more than 1 GW of factory capacity for Heron Power solid-state transformers designed to convert grid electricity into 800-volt DC. The reservation is not confirmation that this equipment has already been installed or is delivering power.
Why are data centers considering 800-volt DC?
AI racks can require far more power than conventional server racks. Higher-voltage distribution may reduce the copper and electrical equipment needed to supply dense racks, but the stated efficiency and material savings are currently vendor claims rather than independently verified results in the supplied material.
What is included in the NiSource-Microsoft deal?
The 20-year agreement adds about 1,100 MW of generation and a 600 MW battery. The source does not provide the project schedule, exact locations or detailed terms for allocating costs.
Will these projects raise household electricity bills?
The source reports higher U.S. average residential prices and higher wholesale prices in PJM, but it does not establish that data centers caused those changes. The effect of new power projects on customers depends on local contracts, regulation and decisions about who pays for grid upgrades.
Source: ThorstenMeyerAI.com
