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TL;DR
Vantage reserved more than 1 gigawatt of factory capacity for Heron Power solid-state transformers that convert grid power to 800-volt DC. A separate 20-year NiSource-Microsoft power agreement includes about 1,100 megawatts of generation and a 600-megawatt battery. The deals show growing interest in power infrastructure for AI data centers, but do not establish that the new designs will deliver the claimed efficiency gains or lower electricity bills.
Data center operator Vantage reserved more than 1 gigawatt of factory capacity for Heron Power solid-state transformers that convert grid electricity directly to 800-volt direct current, according to an October 21 report by ThorstenMeyerAI.com. The move comes as NiSource and Microsoft agreed to a separate 20-year power deal that adds about 1,100 megawatts of generation and a 600-megawatt battery, highlighting how power supply and delivery are becoming central to AI data center plans.
The Vantage arrangement is a reservation of manufacturing capacity, not evidence that more than 1 gigawatt of transformers is already installed or operating. Heron’s design combines power conversion and battery storage, with the battery intended to help manage changes in electricity demand, a challenge also central to optimizing data center operations. The report does not specify the planned delivery schedule, locations or how much of the reserved capacity Vantage will ultimately use.
NiSource’s agreement with Microsoft, signed October 16, is described as a 20-year power deal adding about 1,100 MW of generation and a 600 MW battery. Those figures describe the capacity in the agreement; the available source does not provide the contract’s full financial terms, identify how costs will be allocated among customers, or give a project-by-project construction timeline.
The design shift is driven by increasingly power-dense AI systems. NVIDIA’s reference plan converts 13.8-kilovolt grid power to 800-volt DC at a facility’s edge, then distributes DC to racks. 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. These are company engineering claims, not independent measurements of performance in operating data centers. NVIDIA has said full-scale production is planned with Kyber systems in 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 Delivery Is Becoming an AI Constraint
AI computing demand is changing the scale of data center electrical systems. The International Energy Agency reported that AI server power density increased 11-fold from 2020 to 2025 and projected another fourfold rise by 2027. Its report says a rack could then have peak power demand comparable to 65 households. That projection helps explain why operators are examining different ways to deliver power, not just buying more servers.
Direct-current distribution could reduce the number of conversion steps between the grid and computing equipment. Fewer conversions may mean less energy lost as heat, though the actual gains depend on system design and must be measured in use. At megawatt-scale racks, higher voltage can also reduce the amount of current—and potentially the copper—needed to deliver the same power. The case for batteries is related: storage could help handle quick changes in data center demand and provide support during disturbances, but its costs, operating rules and grid value are not settled by the announced projects.
The consequences extend beyond operators. The IEA estimates global data center electricity use could rise from 485 terawatt-hours in 2025 to 950 TWh in 2030. More generation and grid infrastructure may be needed to serve that demand. Whether households bear any related costs depends on local regulation, utility contracts and how new facilities and network upgrades are financed; the deals cited here do not establish a general effect on consumer bills.
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From Server Rooms to Megawatt Racks
Traditional data centers receive alternating current, step it down through transformers and other equipment, and convert it to low-voltage DC near or inside servers. Each conversion can waste some energy as heat. That architecture developed when racks used far less power; the cited analysis says it becomes harder to accommodate as AI systems approach megawatt-scale rack demand.
In a May 2025 technical post, updated in July, NVIDIA argued that delivering 1 MW at 54 volts could require up to 200 kilograms of copper busbar and occupy substantial rack space with power equipment. NVIDIA’s proposed 800-volt design is intended to address those constraints. A separate October 26 Utility Dive article, sponsored by inverter maker SMA America, described another possible route: a “sidecar” conversion cabinet that can supply 800-volt racks in an existing AC data hall. Its modeled energy-loss figures—about 80 kW for a traditional 1 MW AC chain versus about 20 kW for its proposed DC arrangement—are from a vendor-sponsored white paper, not an independently verified field comparison.
Grid access is also a bottleneck. The IEA says transformers can take two to three years to arrive and grid connections can take five to ten years in some locations. Berkeley Lab reported about 2,300 GW of generation and storage capacity in U.S. interconnection queues at the end of 2024, while only 13% of projects that had previously requested connection were ultimately built. Queue capacity is not the same as capacity certain to be constructed.
“Leaving no room for compute”
— NVIDIA, in its 800 VDC technical blog
Costs, Deployment and Savings Remain Open
The announcements do not confirm when Heron’s transformers will be delivered, how many Vantage sites will use them, or whether the full reserved factory capacity will become deployed equipment. The NiSource-Microsoft agreement’s detailed costs, construction milestones and allocation of generation and battery output are also not given in the source material.
Performance claims for 800-volt DC come mainly from companies and vendor-sponsored analysis. Independent operating data comparing efficiency, maintenance, reliability and total cost against established AC systems is not provided. It is also unclear how quickly the technology will be adopted across existing data centers, which may require conversion equipment or other modifications.
The IEA has said data center batteries could reach 20–25 GW by 2030 and might serve as a grid asset if incentives are right. That is a projection, not a confirmed installation total. How storage would be dispatched, compensated and incorporated into local power systems remains dependent on project design and policy. The available announcements do not show whether these projects will reduce or raise electricity costs for nearby households.
Watch for Orders and Operating Data
The next useful indicators will be delivery schedules and project filings tied to the Vantage reservation and the NiSource-Microsoft agreement. Those details could show where the equipment and generation will be installed, when they are expected to enter service, and how the battery will operate.
For the 800-volt approach, planned production with NVIDIA’s Kyber systems in 2027 is a stated milestone. Evidence from deployments will be needed to test vendor estimates for copper use, efficiency and maintenance against actual costs and performance. Data center operators, utilities and regulators will also face decisions about grid connections, new generation and who pays for supporting infrastructure.
Key Questions
What did Vantage announce?
According to the source report, Vantage reserved more than 1 GW of factory capacity for Heron Power solid-state transformers designed to convert grid power to 800-volt DC. The reservation does not mean that this capacity is already installed.
What is 800-volt DC meant to change?
It is intended to deliver power to high-demand AI racks at a higher voltage, potentially reducing the current, copper requirements and conversion losses. The cited efficiency and copper savings are vendor claims, not independently confirmed results from deployed systems.
How does the NiSource-Microsoft agreement involve batteries?
The reported 20-year agreement includes about 1,100 MW of generation and a 600 MW battery. The source does not provide full contract terms or a detailed schedule for the projects.
Will these projects lower household electricity bills?
The announcements do not establish that. Effects on household bills depend on local utility rules, infrastructure costs and contract arrangements; the source material does not show how those costs will be allocated.
Source: ThorstenMeyerAI.com
