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TL;DR
Two October developments highlight the infrastructure challenge behind AI data center growth: Vantage reserved more than a gigawatt of factory capacity for Heron Power’s solid-state transformers, and NiSource agreed to supply Microsoft with generation and a 600-megawatt battery. The deals show investment in power equipment and storage, but do not establish that 800-volt DC or batteries will solve grid delays or lower electricity bills.
Vantage reserved more than a gigawatt of factory capacity for Heron Power solid-state transformers on October 21, while Indiana utility NiSource signed a 20-year agreement with Microsoft five days earlier that adds about 1,100 megawatts of generation and a 600-megawatt battery. The deals show data center operators and utilities pursuing more power equipment and storage as AI facilities place heavier demands on electricity systems; they do not, by themselves, establish how quickly new capacity will be delivered or who will bear its costs.
Heron Power’s transformer is designed to convert grid electricity to 800-volt direct current (DC), with energy storage integrated into the system to help buffer rapid changes in demand. Vantage’s reservation is for factory capacity, not a reported delivery of equipment or a completed data center installation. The source material does not specify the project’s location, the timing of deliveries or the commercial terms.
The NiSource-Microsoft agreement is a separate power-supply development. NiSource said the 20-year deal adds about 1,100 megawatts of generation and a 600-megawatt battery. The source does not identify the generation technology, give a project schedule or explain how the agreement’s costs will be allocated among Microsoft, the utility’s customers and other parties.
The technology push reflects rising rack power demands. The International Energy Agency (IEA) says AI server power density rose 11-fold between 2020 and 2025 and is projected to quadruple again by 2027. NVIDIA’s 800-volt reference design targets racks drawing up to 1 megawatt, with full-scale production planned alongside its Kyber systems in 2027. NVIDIA’s estimates of lower copper use and higher efficiency are company claims, 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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Power Equipment Sets AI’s Pace
Electricity infrastructure can constrain data center construction even when computing equipment is available. The IEA estimates that transformers can take two to three years to arrive and grid connections can take five to ten years in many places. That means factory capacity, generation agreements and storage plans are part of the schedule for expanding AI computing—not merely supporting equipment added after a facility is built.
Higher-voltage DC distribution could reduce the number of power conversions between the grid and computing equipment. Each conversion loses some energy as heat, adding to cooling needs. 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 vendor estimates; actual performance will depend on system design and operation.
Costs may reach beyond data center operators. The IEA projects global data center electricity use will rise from 485 terawatt-hours in 2025 to 950 terawatt-hours in 2030. That growth could add pressure to generation and grid investment. It does not establish that data centers alone cause household price changes: who pays for new plants and wires depends on contracts and regulation, and the source does not quantify the effect of these specific deals on bills.
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From AC Server Halls to DC
Most data centers have historically received alternating current (AC), stepped it down through transformers and other equipment, and converted it to low-voltage DC inside servers. At conventional rack loads, the arrangement has been workable. At much higher power levels, the conversion equipment, cabling and resulting heat take up more space and energy.
NVIDIA’s reference design moves conversion closer to the facility’s electrical perimeter, distributing 800-volt DC to high-power racks. Its stated comparison is with 415-volt AC distribution and existing 54-volt server systems. These are design specifications and projections from NVIDIA, with production planned for 2027—not proof that the approach has already become standard across data centers.
A Utility Dive article published October 26 makes a case for DC distribution and storage, but it is sponsored content from inverter maker SMA America. Its model estimates that delivering 1 megawatt through a traditional AC chain loses about 80 kilowatts, compared with about 20 kilowatts in a design converting to 800-volt DC outside the building. These are figures from the company’s white-paper model, not independently verified results. SMA also describes “sidecar” conversion cabinets as a way to connect DC racks to existing AC halls.
“A 1 MW rack at today’s 54 volts would take up to 200 kg of copper busbar.”
— NVIDIA, in its 800 VDC technical blog
Costs, Delivery and Performance
The reported announcements leave key project details open. Vantage’s factory-capacity reservation does not say when Heron equipment will be delivered, where it will be installed or how much power it will serve. The NiSource agreement’s generation source, construction timeline and cost-allocation terms are not provided in the source material.
It is also unclear how widely 800-volt DC systems will be adopted or how their real-world efficiency compares with existing AC designs. NVIDIA’s savings estimates and SMA’s modeled conversion losses are vendor-provided; the material cites no independent, operating-site measurements that confirm those results. Battery use can help manage fluctuations, but the scale and grid value of such systems will depend on deployment and market incentives.
Finally, projections of growing electricity demand do not determine the effect on household bills. The source reports average U.S. residential electricity prices of 18.21 cents per kilowatt-hour in 2026, compared with 17.30 cents in 2025, and a 41% rise in wholesale prices in the PJM region. Those figures have different contexts, and the reported material does not establish that the AI projects described caused either change.
Watch for Projects and Deliveries
The next milestones are whether Vantage’s reserved factory capacity turns into equipment deliveries and installations, and how NiSource’s generation and battery projects proceed under its Microsoft agreement. Project schedules, operating data and cost terms will help establish how much power the deals add and when.
For the broader technology shift, NVIDIA has planned full-scale production of its 800-volt design with Kyber systems in 2027. Operators’ retrofit choices—including SMA’s proposed sidecar approach—will show whether DC distribution can fit existing data center halls as well as purpose-built facilities. Independent measurements of energy losses, cooling needs and battery performance will be needed to test company projections against actual operations.
Key Questions
What did Vantage announce?
Vantage reserved more than a gigawatt of factory capacity for Heron Power solid-state transformers designed to convert grid power to 800-volt DC. The reported reservation is not the same as a confirmed delivery or installation.
What is the NiSource-Microsoft agreement?
NiSource signed a 20-year power agreement with Microsoft that adds about 1,100 megawatts of generation and a 600-megawatt battery. The source material does not state the generation technology, construction schedule or cost-allocation terms.
Why are data centers considering 800-volt DC?
Higher-power racks require substantial electrical distribution equipment. NVIDIA says moving power at 800 volts DC could reduce copper use and improve efficiency compared with specified existing systems, but these are vendor estimates and have not been independently confirmed here.
Will these deals lower household electricity bills?
The announcements do not establish that. Bill impacts depend on how new generation, grid upgrades and storage are financed and regulated; the source does not quantify the effect of either agreement on household rates.
Source: ThorstenMeyerAI.com
