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TL;DR
Vantage reserved more than 1 gigawatt of factory capacity for Heron Power solid-state transformers, while NiSource and Microsoft signed a long-term power deal that includes a 600-megawatt battery. The projects reflect growing interest in 800-volt direct-current systems as AI racks demand more power, but the shift also depends on electrical infrastructure and skilled workers. Deployment timelines, workforce needs and the final costs to customers remain uncertain.
Data-center power infrastructure is drawing new investment as AI racks push electricity demands higher: Vantage reserved more than 1 gigawatt of factory capacity for Heron Power solid-state transformers on October 21, and NiSource signed a 20-year power deal with Microsoft five days earlier that includes a 600-megawatt battery. The projects point to growing interest in 800-volt direct-current systems and on-site storage, technologies that will require electrical workers to install, connect and maintain increasingly complex power equipment, alongside broader data center grid-capacity challenges.
Heron Power’s solid-state transformer is designed to convert grid electricity directly into 800-volt DC, with battery storage integrated into the system, according to the source report. Vantage’s reservation is for factory capacity, not confirmation that a specific number of transformers has already been delivered or installed. The report does not specify the project locations, deployment schedule or number of electricians who will work on the equipment.
The NiSource-Microsoft agreement is a separate development. NiSource will provide about 1,100 megawatts of generation and a 600-megawatt battery under a 20-year deal, according to the report. Those figures describe planned power resources tied to the contract; they do not establish how much electricity a particular data center will use at any given time or how the project’s costs will be allocated among customers, questions also relevant to shared data center operations.
The engineering case for higher-voltage DC is tied to rising rack power. The International Energy Agency’s April 2026 report says AI server power density increased 11-fold from 2020 to 2025 and could quadruple again by 2027. NVIDIA’s reference design proposes converting 13.8-kilovolt grid power to 800-volt DC near a facility’s perimeter, then distributing it to racks. 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, an infrastructure shift that makes accurate data center build records important. Those figures are company estimates, not independent measurements.
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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The Electrical Work Behind AI Growth
Moving power through a data center is not just a question of buying transformers. Higher-power systems involve equipment installation, cable and busbar connections, protection systems, testing, commissioning and ongoing maintenance. That makes electricians and other power specialists part of the infrastructure response to AI growth, alongside utilities, equipment makers and data-center operators.
DC systems may reduce some conversion steps and the amount of copper needed, according to vendor designs, but they also change where and how electrical equipment is installed. Operators may retrofit existing halls with conversion cabinets, sometimes called sidecars, rather than replace every part of an AC power system at once. That could create work across both new construction and upgrades, though the source material provides no staffing estimates, training requirements or data on how many jobs the shift will generate.
The stakes extend beyond the data-center fence. The IEA projects global data-center electricity use to rise from 485 terawatt-hours in 2025 to 950 TWh in 2030. Grid connections and transformers can take years to secure, and the source report says interconnection queues are large and many proposed projects are never built. Whether new generation and storage relieve pressure on local grids—or add costs that reach other customers—will depend on project contracts, utility rules and how infrastructure is paid for.
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From AC Server Rooms to DC Racks
Most data centers have historically received alternating-current power and converted it through several stages before servers use low-voltage DC. Each conversion loses some energy as heat, which cooling equipment must then remove. That arrangement worked when server racks drew tens of kilowatts; the proposed shift responds to much higher rack loads, including designs targeting 1 megawatt per rack.
NVIDIA’s technical material says delivering that power at 54 volts could require up to 200 kilograms of copper busbar for a rack. The company’s 800-volt architecture is intended to move more power through conductors of a given size. NVIDIA has said full-scale production is planned with its Kyber systems in 2027. The date is a company plan, not confirmation that the design is already operating widely.
A Utility Dive article published October 26 describes a possible interim approach: a sidecar conversion cabinet that allows 800-volt racks to operate in data halls built around AC systems. The article was sponsored by SMA America, an inverter maker, and its estimated energy-loss comparison is a vendor-sponsored model, not an independent field result. The source report also cites IEA estimates that data-center batteries could total 20–25 gigawatts by 2030; that is a forecast, not installed capacity today.
Costs, Jobs and Deployment Remain Open
The reported capacity reservation does not show how many Heron transformers will be manufactured, when they will reach operating sites, or whether the reserved factory capacity will translate into completed installations. The available material also does not identify the electricians or contractors involved, their expected workload, or whether specialized training will be required.
Performance claims remain another open point. NVIDIA’s copper and efficiency figures are vendor estimates, while SMA’s loss comparison comes from sponsored material. The source report offers no independent, real-world comparison of 800-volt installations against existing systems. It also does not detail the full cost of conversion equipment, battery systems, retrofits or maintenance.
Finally, the NiSource-Microsoft contract’s generation and battery figures do not by themselves explain who pays for new infrastructure or how electricity costs may change for households. The source report cites rising US residential rates and higher wholesale prices in PJM, but does not establish that these projects caused those changes. The connection between data-center demand and household bills varies by region and utility arrangements.
Projects Move Toward Installation
The next evidence will come from project schedules and equipment deployment: whether Vantage’s reservation leads to delivered transformers, how Heron’s system performs when connected to a live data-center load, and whether operators adopt sidecar conversions or build around DC from the outset. NVIDIA’s stated target is full-scale production with Kyber systems in 2027; actual rollout and independent performance data remain to be seen.
For the NiSource-Microsoft agreement, subsequent project filings and construction milestones should clarify when the generation and battery resources are expected to become available. Utility and data-center plans may also show how sites will manage rapid load changes and what arrangements cover grid upgrades. As deployments proceed, workforce figures, contractor notices and training programs could help establish the scale of demand for electricians—but no such figures are provided in the current source material.
Key Questions
What does 800-volt DC mean for a data center?
It is a proposed way to distribute power at 800 volts direct current through a facility, reducing some conversion steps before electricity reaches high-demand AI racks. The precise design and benefits depend on the equipment and site.
What did Vantage and Heron Power announce?
Vantage reserved more than 1 gigawatt of factory capacity for Heron Power solid-state transformers designed to convert grid power to 800-volt DC. The report does not say that this amount of equipment has already been delivered or installed.
How are electricians involved in the shift?
Electrical workers are needed to install, connect, test and maintain power systems, including transformers, batteries, distribution equipment and retrofit cabinets. The source material does not quantify the number of jobs or specify training requirements.
Are the reported efficiency and copper savings independently verified?
No independent verification is cited in the source material. NVIDIA’s figures are vendor claims, and the SMA comparison comes from sponsored material and is described as a model.
Will these projects lower household electricity bills?
The available information does not establish that. The cost impact will depend on local grid conditions, contracts, utility rules and who pays for generation, storage and transmission upgrades.
Source: ThorstenMeyerAI.com
