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TL;DR
Recent data center and utility developments show that AI expansion depends on power infrastructure as well as chips. Vantage reserved more than a gigawatt of manufacturing capacity for Heron Power’s solid-state transformer, while NiSource signed a 20-year deal with Microsoft that includes about 1,100 megawatts of generation and a 600-megawatt battery. The deals spotlight the electricians and power engineers needed to build and operate increasingly dense facilities, but do not establish how costs will affect household bills.
AI data center expansion is putting electrical infrastructure and the workers who build it under pressure, as Vantage reserved more than a gigawatt of factory capacity for a solid-state transformer and NiSource signed a 20-year power agreement with Microsoft. The developments, reported in October, highlight a growing challenge for operators: supplying dense, power-hungry AI systems when new equipment and grid connections can take years to secure.
On October 21, Vantage reserved more than 1 gigawatt of factory capacity for a solid-state transformer made by Heron Power. The system is designed to convert grid power directly to 800-volt direct current and includes battery storage. The reported reservation concerns manufacturing capacity; it does not, by itself, confirm that transformers have been delivered or installed at operating data centers.
Five days earlier, Indiana utility NiSource signed a 20-year agreement with Microsoft that adds about 1,100 megawatts of generation and a 600-megawatt battery, according to the source report. The figures describe the planned deal, not independently verified output from facilities already in service. The agreement shows how data center power supply can involve long-term contracts for both generation and storage.
These projects depend on people as well as equipment: electricians, power engineers and construction crews must install and maintain transformers, switchgear, cabling, batteries and data center infrastructure. The source report does not provide employment figures, project staffing levels or details about which contractors will perform the work. A Utility Dive article published October 26, sponsored by inverter maker SMA America, also argued for moving toward 800-volt DC distribution. Its sponsorship means its modeled efficiency figures should be treated as a vendor-sponsored case, not independent field 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 Work Moves Beyond the Server Rack
For data center operators, electricity supply and connections can set the pace of expansion even when chips and buildings are available. The source report, citing the International Energy Agency, says transformers can take two to three years to arrive and grid connections can take five to ten years in many locations. That creates demand for skilled workers who can design, install and maintain high-voltage infrastructure, as well as for manufacturers able to deliver the equipment.
The changes may also affect electricity systems beyond individual campuses. Batteries could smooth rapid changes in data center demand and, under suitable incentives, potentially support the grid. But whether they do so depends on how projects are operated and contracted. Costs for generation, transmission and distribution are also allocated through specific agreements and regulatory decisions; the reported deals do not establish who ultimately pays every cost or how much consumers may be affected.
For households, the report cites an average US residential electricity price 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. These figures have different scopes and do not prove that data centers caused the changes. The connection between new data center demand and local bills depends on location, market conditions and how utilities recover infrastructure costs.
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Why AI Power Designs Are Changing
Traditional data centers receive alternating-current power and convert it several times before servers use it as low-voltage DC. Each conversion loses some energy, much of which becomes heat that cooling systems must remove. The source report cites the IEA’s estimate that global data center electricity use could rise from 485 terawatt-hours in 2025 to 950 terawatt-hours in 2030. It also cites Berkeley Lab estimates that US data centers used 4.4% of national electricity in 2023 and could account for 6.7% to 12% by 2028.
The pressure is not only about total consumption but also power density per rack. The report says an IEA analysis found AI server power density increased 11-fold from 2020 to 2025 and could quadruple again by 2027. NVIDIA’s reference design proposes converting power near the facility perimeter and distributing it to racks at 800 volts DC. 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; full-scale production with its Kyber systems is planned for 2027.
Storage is part of the same shift. The IEA estimate cited in the report puts potential data center battery installations at 20 to 25 gigawatts by 2030. Batteries can help manage short-term swings in demand, but their grid role depends on incentives and operating arrangements. The report also cites Berkeley Lab data showing about 2,300 gigawatts of capacity in US interconnection queues at the end of 2024; only 13% of earlier requests were built. Queue capacity is not the same as projects certain to be constructed.
Costs, Jobs and Performance Still Unclear
The reported agreements do not specify how many electricians or other workers will be hired, where all the infrastructure will be built, or when it will begin operating. Vantage’s reservation is for factory capacity, while the NiSource-Microsoft deal is a long-term power agreement; the source does not report completed delivery or operational results from either development.
Claims about 800-volt systems also need careful qualification. NVIDIA’s efficiency, copper and maintenance figures are company estimates. SMA America’s modeled comparison appeared in sponsored Utility Dive content, and the source provides no independent test results showing how the modeled savings perform across operating facilities. It is also unclear how quickly operators will adopt the systems or whether retrofits will be practical at existing sites.
Finally, the effect on household bills remains uncertain. National residential prices and regional wholesale-price movements do not isolate the impact of data centers. The source does not provide project-by-project cost allocation, utility rate decisions or evidence tying the reported price changes directly to these agreements.
Watch Construction and Grid Agreements
The next evidence will come from whether the reserved transformer capacity becomes delivered equipment and whether the NiSource-Microsoft supply plan advances into construction and operation. Further project filings and utility agreements may clarify timelines, transmission needs, battery operation and how costs are assigned.
Operators and power-system suppliers will also need to show whether 800-volt DC distribution performs as claimed under real data center loads. NVIDIA has said full-scale production with Kyber systems is planned for 2027. Until independent measurements and operating records are available, the efficiency and materials benefits should be treated as projections. For the workforce, project schedules, contractor disclosures and hiring notices will provide a clearer picture of the electricians and engineers needed.
Key Questions
What did Vantage reserve?
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 the equipment has been delivered or installed.
What is included in NiSource’s agreement with Microsoft?
The reported 20-year agreement adds about 1,100 megawatts of generation and a 600-megawatt battery. The source does not give an operating date or project-level cost allocation.
Why are data centers considering 800-volt DC power?
Higher-voltage distribution can move more power through conductors with less current, potentially reducing copper needs and conversion losses. NVIDIA’s published savings are vendor claims, not independent measurements of operating facilities.
Does this mean data centers are causing higher household electricity bills?
The report cites rising US residential prices and higher wholesale prices in PJM, but those figures do not establish that data centers caused the increases. The effect on bills depends on local power markets, utility decisions and how infrastructure costs are allocated.
How many electricians will these projects require?
The source does not provide a job count. It identifies electrical installation and engineering work as part of the infrastructure build-out, but staffing needs and contractors for the reported projects remain unclear.
Source: ThorstenMeyerAI.com
