🔍 Read the full analysis: Why AI’s Energy Demands Are Shaping Data Center Electrical Design on ThorstenMeyerAI.com
Get privacy and security gear delivered free with Prime
- Fast, free delivery on millions of items
- Prime Video, Amazon Music and more included
- Member-only deals all year
TL;DR
Two October developments show how AI data center growth is shifting attention from chips to electricity infrastructure: Vantage reserved more than 1 gigawatt of factory capacity for a solid-state transformer, and NiSource agreed to a long-term power deal with Microsoft that includes new generation and a battery. The projects reflect growing interest in higher-voltage DC distribution and energy storage, but claims about efficiency gains are largely vendor estimates, and grid connections remain a major constraint.
Two recent power deals show how rising AI data center demand is reshaping electrical planning: Vantage reserved more than 1 gigawatt of factory capacity for a solid-state transformer designed to supply 800-volt direct current, while NiSource signed a 20-year agreement with Microsoft tied to about 1,100 megawatts of generation and a 600-megawatt battery. The projects point to a shift in attention from processors alone to the power systems and grid capacity needed to run them.
Vantage’s October 21 reservation concerns production capacity for a transformer from Heron Power, according to the source material. The device is designed to convert grid electricity directly into 800-volt DC, with energy storage integrated into the system. The reservation is not the same as confirmation that a gigawatt of equipment has been installed or that it is already supplying data centers.
On October 16, NiSource signed a 20-year power agreement with Microsoft that adds about 1,100 megawatts of generation and a 600-megawatt battery, according to the source. The deal illustrates how utilities and large technology companies are arranging additional supply and storage to serve new computing demand. The available information does not specify the complete project schedule or how its costs will be allocated.
The technical case for DC distribution is gaining attention as rack power rises. The International Energy Agency (IEA) 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 edge and distributing it to 1-megawatt racks. NVIDIA claims the approach could use 45% less copper and improve end-to-end efficiency by up to 5% compared with current 54-volt systems. Those are vendor projections, 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).
Powered by Thorsten Meyer AI
Power Limits Shape AI Expansion
For data center operators, the practical issue is increasingly whether a site can secure enough electricity and equipment on time—not just whether it can buy the latest accelerators. The IEA estimates that transformers can take two to three years to arrive and grid connections can take five to ten years in some locations. Those lead times can affect where facilities are built, how quickly capacity comes online and how much planning must happen before construction.
Electrical design also affects space, heat and operating costs. Traditional systems convert power at several stages, with energy lost as heat at each conversion. A higher-voltage DC system could reduce some of those conversions and the amount of copper required, according to NVIDIA and other suppliers. The size of any real-world gains will depend on the facility design and must be tested against independently measured performance, installation costs and maintenance needs.
Storage may help manage sudden changes in computing demand and provide backup or grid support. The IEA projects 20–25 gigawatts of batteries at data centers by 2030. That is a forecast, not a confirmed deployment total. Whether batteries can serve as broader grid assets depends on how they are operated, local rules and the incentives offered to operators.
There is also a public-cost question. More electricity demand can require new generation, transmission and distribution infrastructure. US residential electricity averaged 18.21 cents per kilowatt-hour in 2026, compared with 17.30 cents in 2025, according to the source’s account of Energy Information Administration figures. That comparison does not establish that data centers caused the increase; the impact of new projects on household bills depends on regional systems and how project costs are assigned.
Products Worth Considering
Jackery HomePower 1000 Plus v2 Portable Power Station
Jackery Explorer 300 Portable Power Station with 40W Solar Panel
Bose S1 Pro+ Portable PA Speaker
As an affiliate, we earn on qualifying purchases.
From AC Rooms to DC Racks
Data centers have traditionally received alternating current and converted it through several stages before servers use low-voltage DC. Transformers, uninterruptible power supplies and distribution equipment each form part of that chain. As racks draw more power, operators and suppliers are examining whether fewer conversions and higher distribution voltage can make the power path more manageable.
The challenge is not limited to equipment inside a building. The IEA estimates global data center electricity use could rise from 485 terawatt-hours in 2025 to 950 terawatt-hours in 2030. Berkeley Lab estimated US data centers used 4.4% of national electricity in 2023 and could reach 6.7% to 12% by 2028. The latter range is a projection, not a measured outcome.
NVIDIA says a 1-megawatt rack supplied at 54 volts could require up to 200 kilograms of copper busbar. It plans full-scale production of its 800-volt design with Kyber systems in 2027. An intermediate option described by inverter maker SMA America is a conversion cabinet, or “sidecar,” placed next to racks in existing AC halls. SMA’s October 26 article was sponsored content, and its comparisons should be read as a company’s model rather than an independent field result.
“NVIDIA says its design could require 45% less copper than 415-volt AC distribution and provide up to 5% better end-to-end efficiency than current 54-volt systems.”
— NVIDIA, in its 800 VDC technical blog
Costs and Performance Still Open
The announcements establish a factory-capacity reservation and a long-term utility agreement, but they do not show how quickly the transformer system will be deployed at scale or how much of the planned generation and storage is operating. The source does not provide a complete project timeline, capital-cost breakdown or terms explaining who bears costs for the NiSource-Microsoft deal.
It is also unclear how the proposed 800-volt designs will perform across different data center layouts. The cited savings in copper, energy losses and maintenance come from NVIDIA or SMA, not independent operational studies. Actual results could vary by site, equipment and how much of an existing electrical system is replaced.
Grid queues add another uncertainty. Berkeley Lab reported about 2,300 gigawatts of generation and storage capacity in US interconnection queues at the end of 2024, while only 13% of requests from earlier queue cohorts had reached operation. Queue capacity is not the same as projects that will be built, and the figures do not predict the outcome for any particular data center.
Track Deployment and Grid Approvals
The next useful milestones are whether Heron Power turns its factory reservation into delivered equipment, when Vantage deploys the transformer, and whether operators publish measured performance from working 800-volt systems. NVIDIA has said full-scale production with Kyber systems is planned for 2027; that is a stated plan, not confirmation that deployments will meet every projected efficiency figure.
For the NiSource-Microsoft agreement, project schedules, permits, construction progress and the treatment of costs will help clarify how the additional generation and battery are delivered. More broadly, grid connection approvals and transformer availability will indicate whether electricity infrastructure can keep pace with proposed data center growth. Utilities, regulators and customers will also face decisions about how the cost of new generation and network upgrades is divided.
Key Questions
What did Vantage announce?
Vantage reserved more than 1 gigawatt of factory capacity for a Heron Power solid-state transformer designed to convert grid power to 800-volt DC. The reservation does not establish that the equipment has been installed or is already in service.
What is the NiSource-Microsoft deal?
NiSource signed a 20-year power agreement with Microsoft that adds about 1,100 megawatts of generation and a 600-megawatt battery, according to the source material. Project timing and cost allocation were not provided.
Why are data centers considering 800-volt DC?
Higher-voltage DC distribution may reduce conversion stages and the amount of copper needed as rack power rises. NVIDIA’s projected savings are vendor claims; the source does not cite independent operating measurements confirming them.
Will data center growth raise household electricity bills?
It may add demand for power and grid infrastructure, but the effect on household bills depends on location, market conditions and how utilities and regulators assign project costs. The figures cited do not establish that data centers caused the reported increase in average US residential rates.
Source: ThorstenMeyerAI.com
