Chapter 14: Power Distribution, Transmission & Grid

14.1 Overview

Power generation (Chapter 13) is necessary but not sufficient. The electricity must travel from the generator to the GPU, passing through high-voltage transmission lines, step-down transformers, switchgear, uninterruptible power supplies, power distribution units, and finally the busbars and cables that deliver current to each server. Every link in this chain is experiencing unprecedented demand, and the weakest link, transformers, carries the longest lead times of any single component in the buildout (128-144 weeks), making it a binding constraint on data center deployment timelines.

The transformer shortage is the most acute infrastructure crisis facing the data center industry. Since 2019, demand for high-voltage power transformers has surged 116% and demand for generator step-up transformers has surged 274%, far outpacing domestic manufacturing capacity. Lead times for large power transformers averaged 128 weeks (2.5 years) in Q2 2025, with generator step-up units at 144 weeks (2.8 years). In some cases, orders take up to four years to fulfill. The US manufactures only about 20% of its power transformer needs domestically, leaving 80% dependent on imports. Wood Mackenzie projects a 30% supply shortfall for power transformers in 2025 ⁴⁵⁶.

The major transformer manufacturers are responding with billions in capacity expansion. Hitachi Energy (the world’s largest transformer maker) has committed $6 billion and 15,000 new hires over three years, including a $457 million facility in South Boston, Virginia, set to become the largest transformer plant in the US by 2028. Siemens Energy is building a $150 million plant in Charlotte, North Carolina (production starting early 2027). Eaton has committed $340 million for a three-phase transformer facility in South Carolina (2027). Despite these investments, supply is not expected to reach equilibrium until 2028-2030 ⁴⁵⁷.

Below the transformer, the data center power chain includes switchgear (which protects equipment from electrical faults), UPS systems (which provide backup power during outages), and power distribution units (PDUs, which route power to individual racks). The data center UPS market was $8.76 billion in 2025 and is projected to reach $12.47 billion by 2030. The top five suppliers (Schneider Electric, Vertiv, Eaton, ABB/Hitachi Energy, and Huawei) account for roughly 40-42% of market share. In North America, the top five (ABB, Schneider, Vertiv, Eaton, Mitsubishi Electric) hold about 62% of the data center power market ⁸⁹¹⁰.

Vertiv deserves special attention as a pure-play data center infrastructure company covering power, cooling, and racks. Q3 2025 revenue was $2.6 billion (+29% YoY), with organic orders up 60% and a backlog of $9.5 billion. Full-year 2025 revenue guidance exceeded $10 billion. Vertiv is expanding manufacturing in North America and recently acquired Purge Rite for approximately $1 billion to enhance liquid cooling capabilities ¹¹¹².

Powell Industries is an emerging play in data center power infrastructure. The company manufactures custom-engineered medium-voltage switchgear and booked its first data center megaproject exceeding $75 million in Q1 FY2026, with total data center orders surpassing $100 million in the quarter. Powell’s record backlog of $1.6 billion (1.7x book-to-bill) reflects rising demand for the switchgear needed to handle the increased power requirements of AI data centers ¹³¹⁴.

The power distribution layer also includes semiconductor companies that design voltage regulators and power management ICs for servers and GPUs. Monolithic Power Systems (MPWR) manufactures the voltage regulators that sit on GPU boards, converting 12V or 48V input to the precise voltages each chip requires. As GPU power consumption rises (700W+ for a single Blackwell GPU), the power delivery silicon becomes both more critical and more valuable per server.

14.2 Market Sizing & Growth

Data center power market (total): The US data center power market generated significant revenue in 2025, with UPS systems accounting for 36% share. The global data center switchgear market was valued at $2.24 billion in 2025, projected to reach $3.82 billion by 2034 at 8.1% CAGR ⁸¹⁵.

Data center UPS market: $8.76 billion in 2025, projected $12.47 billion by 2030 at 7.3% CAGR ⁹.

Transformer market: The US transformer market is approximately $1.49 billion (domestic production), but total demand far exceeds this. The global transformer market is projected to grow from $48 billion to $67 billion by 2030 (Rystad Energy). Transformer prices have risen 60-80% since 2020 ⁶⁷.

Vertiv: Q3 2025 revenue $2.6 billion (+29% YoY). Full-year 2025 guidance >$10 billion. Organic orders +60% YoY in Q3. Backlog $9.5 billion (+30% YoY). Adjusted operating margin 22.3%. Market cap ~$45B ¹¹¹².

Eaton: Major diversified industrial company with significant data center power exposure. Three-phase transformer facility ($340M) in South Carolina. Data center segment includes UPS, PDUs, switchgear. Total revenue approximately $24B+ ¹.

Schneider Electric: Global leader in data center power management (EcoStruxure platform). UPS, PDUs, intelligent energy management. Collaborated with NVIDIA on 800 VDC sidecar power module for megawatt-scale rack power delivery (April 2025) ¹⁰.

Powell Industries: Record backlog $1.6B (1.7x book-to-bill). First DC megaproject >$75M in Q1 FY2026. Q4 FY2025 gross margin 31.4%. Market cap ~$11.3B ¹³¹⁴.

14.3 Supply Chain Flowchart

POWER DISTRIBUTION: GRID TO GPU
    |
    |---> HIGH-VOLTAGE TRANSMISSION (utility grid to data center site)
    |    Transmission lines: 115-765 kV
    |    Grid operators: PJM (mid-Atlantic), ERCOT (Texas), MISO, CAISO
    |    Interconnection queue: 190 GW in PJM alone; 3-5 year processing
    |    Advanced conductors: HTLS reconductoring (2-3x capacity on existing towers)
    |         |
    |         v
    |---> STEP-DOWN TRANSFORMERS (facility boundary)
    |    High-voltage to medium-voltage (138kV → 13.8kV typical)
    |    Manufacturers:
    |         Hitachi Energy: #1 globally; $6B investment, $457M VA plant
    |         Siemens Energy: $150M Charlotte plant (2027)
    |         GE Vernova: switchgear + grid solutions
    |         Eaton: $340M SC facility (2027)
    |         Hyosung HICO: $157M Memphis expansion
    |         Prolec GE: $300M+ across multiple US sites
    |    Lead times: 128 weeks (power), 144 weeks (GSU) as of Q2 2025
    |    Shortfall: 30% power transformer deficit; 47% GSU deficit (2025)
    |         |
    |         v
    |---> MEDIUM-VOLTAGE SWITCHGEAR (building entry / main distribution)
    |    Protects against faults, enables safe isolation for maintenance
    |    Manufacturers:
    |         Schneider Electric: leader in MV/LV switchgear
    |         Eaton: integrated switchgear + UPS solutions
    |         ABB/Hitachi Energy: MV switchgear for hyperscale
    |         Powell Industries: custom-engineered MV switchgear
    |              Record $1.6B backlog; first $75M+ DC megaproject
    |         Siemens Energy: MV distribution systems
    |    Data center switchgear market: $2.24B (2025) → $3.82B (2034)
    |         |
    |         v
    |---> UNINTERRUPTIBLE POWER SUPPLY (UPS)
    |    Provides battery backup during grid outages (seconds to minutes)
    |    Market: $8.76B (2025) → $12.47B (2030)
    |    Manufacturers:
    |         Schneider Electric: Galaxy VXL (500-1,250 kW, scalable to 5 MW)
    |         Vertiv: Trinergy, PowerUPS 9000, OneCore modular platform
    |         Eaton: 3-phase UPS, acquired Resilient Power Systems (2025)
    |         ABB: HiPerGuard MV static UPS for AI-ready facilities
    |         Huawei: lithium-ion UPS, AI-driven energy management
    |    Trend: Li-ion replacing VRLA batteries; modular designs for 5 MW+
    |         |
    |         v
    |---> POWER DISTRIBUTION UNITS (PDUs) & BUSWAY
    |    Routes power from UPS to individual racks
    |    Manufacturers: Vertiv, Schneider, Eaton, Legrand, ServerTech
    |    Trend: HVDC distribution (48V to rack, 800V facility) gaining traction
    |    Schneider + NVIDIA: 800 VDC sidecar for megawatt-scale rack delivery
    |         |
    |         v
    +---> SERVER-LEVEL POWER DELIVERY (board level)
         Voltage regulators: 48V/12V → 0.7-1.2V for GPU cores
         Monolithic Power Systems (MPWR): GPU VRMs, high-current PoL
         Infineon: power stages, gate drivers
         Renesas: digital power controllers
         Texas Instruments: power management ICs
         Trend: 48V rack architecture replacing 12V for efficiency

14.4 Key Companies

Company	Ticker	Exchange	Approx. Mkt Cap	Role in Buildout	Key Metric
Vertiv Holdings	VRT	NYSE	~$131B	Pure-play DC infrastructure: UPS, PDUs, cooling, racks	Q3 2025 revenue $2.6B (+29%); backlog $9.5B; FY2025 >$10B
Schneider Electric	SU	Euronext Paris	~$170B	Global leader in data center power (EcoStruxure), UPS, switchgear, PDUs	Collaborated with NVIDIA on 800 VDC; Galaxy VXL UPS launch
Eaton	ETN	NYSE	~$135B	UPS, switchgear, transformers, circuit protection for data centers	$340M transformer plant; acquired Resilient Power Systems (2025)
Hitachi Energy (ABB)	Private	Subsidiary of Hitachi	Private	World’s largest transformer maker; MV/HV switchgear	$6B investment + 15,000 hires; $457M Virginia plant (2028)
Siemens Energy	ENR	XETRA	~$183B	Transformers, switchgear, gas turbines, grid solutions	$150M Charlotte transformer plant (2027); global grid equipment
GE Vernova	GEV	NYSE	~$280B	Gas turbines, grid equipment, switchgear, capacitors	$20M expansion in PA/FL; grid solutions + power generation hardware
Powell Industries	POWL	NASDAQ	~$11.3B	Custom MV switchgear; emerging data center focus	Backlog $1.6B (1.7x B/B); first $75M+ DC order Q1 FY2026
Monolithic Power Systems	MPWR	NASDAQ	~$181B	GPU voltage regulators, high-current PoL converters, power management ICs	Critical power delivery silicon for NVIDIA/AMD GPU boards
Infineon Technologies	IFX	XETRA	~$89.0B	Power semiconductors: MOSFETs, gate drivers, power stages for server VRMs	Largest power semiconductor company globally
Legrand	LR	Euronext Paris	~$40.9B	PDUs, rack power, structured cabling, server racks	Data center infrastructure; Raritan (PDU) and Server Technology brands
Delta Electronics	2308	TWSE	~$176B	UPS, PDUs, power supplies for data centers; modular power systems	Major supplier in Asia-Pacific DC market; high-density solutions
TBEA Co.	600089	SSE	~$19.0B	Chinese transformer manufacturer; largest in Asia	Dominant in Chinese domestic transformer market. Expanding internationally. Relevant to understanding global transformer supply that the US cannot access due to trade tensions.
WEG S.A.	WEGE3	B3 (Brazil)	~$131B	Electric motors, transformers, power and automation	Investing R$1.2B to expand transformer production in Brazil, Mexico, and Colombia. R$370M Betim plant expansion (H2 2026). Also US OTC as WEGZY.
China XD Electric	601179	SSE	~$12.2B	Chinese transformer and switchgear manufacturer	State-owned; supplies domestic Chinese grid and data center projects
CG Power (Crompton Greaves)	500093	BSE (India)	~$15.0B	Indian transformer and switchgear manufacturer	Benefiting from global transformer shortage. India emerging as transformer manufacturing hub.
Navitas Semiconductor	NVTS	NASDAQ	~$4.1B	GaN power semiconductors for 800V DC data center architectures	10 kW GaN DC-DC platform (98.5% efficiency at 800V-to-50V); separate 800V-to-6V board (96.5% efficiency, Mar 2026); GF partnership for US GaN manufacturing
Vicor Corporation	VICR	NASDAQ	~$10.0B	Modular power conversion; 800VDC/400VDC to 48VDC for AI racks	BCM6135 family for 800V; ChiP fab scaled; Gen 5/6 modules for >1,000W processors
Prysmian Group	PRY	Borsa Italiana	~$43.6B	World’s largest power cable manufacturer; HV/MV cables for DC grid interconnection	Revenue EUR 29B (2025); HVDC cable lead times 18-24 months at peak demand
nVent Electric	NVT	NYSE	~$27.5B	Power distribution units, enclosures, busway, liquid cooling hardware for DCs	Modular liquid-cooling for 100kW+ cabinets; power scaling 30A to 200A+; high-density AI rack specialist
Hubbell	HUBB	NYSE	~$26.0B	Electrical infrastructure, data center power delivery, cabling systems	Acquired DMC Power ($825M, 2025) for AI DC power; acquiring NSI Industries ($3B) for connectivity
Hammond Power Solutions	HPS.A	TSX	~$2.4B	Pure-play dry-type transformer manufacturer; data center distribution transformers	Q1 2026 revenue CAD $265M (+31.5% YoY), record quarter; FY2025 CAD $898M (+13.9%); DC demand driving custom product growth
HD Hyundai Electric	267260	KRX	~$15.0B	Top-tier large power transformer manufacturer; #1 in US ultra-high-voltage market	US orders $1.78B; $274M invested to expand capacity 30% by 2026; Alabama + Ulsan plants
Cleveland-Cliffs	CLF	NYSE	~$6.2B	Sole domestic US producer of GOES (grain-oriented electrical steel) for transformer cores	TRAN-COR brand from Butler Works, PA; cancelled $150M Weirton transformer plant (May 2025)

The global transformer shortage (see Section 14.5) cannot be understood through Western manufacturers alone. TBEA, WEG, and Indian producers like CG Power represent a significant fraction of global transformer manufacturing capacity. Their relevance to the report is twofold: they supply the non-Western data center buildout (China, India, Middle East), and their capacity expansion (or lack thereof) determines how quickly the global shortage eases.

14.5 Bottleneck Analysis

Large power transformers (SEVERE, the longest-lead-time constraint in the buildout): Transformers score RPN 135 in the cross-cutting FMEA (Chapter 22), the highest of any infrastructure-layer bottleneck. A large power transformer costs $3-10 million, representing roughly 0.5-1% of total facility cost for a 100 MW data center ($900M-1.5B). The bottleneck is not cost but timeline: lead times of 128-144 weeks mean that a data center project started today may not receive its main power transformer until 2028. The 30% supply shortfall (2025) means some projects simply cannot proceed on schedule. The US manufactures only 20% of its power transformer needs domestically. Tariffs on steel (50% duty on copper, Section 232 duties on steel) raise costs for both imported and domestic transformers. While Hitachi Energy, Siemens, and Eaton are building new plants, these won’t reach full capacity until 2027-2028. Until then, transformer delivery is a hard constraint on data center deployment timelines ⁴⁵⁶⁷.

The second-order bottleneck within the transformer bottleneck is GOES (Grain-Oriented Electrical Steel), the specialty steel used in transformer cores. Without GOES, you cannot build a power transformer, regardless of manufacturing capacity. Cleveland-Cliffs (CLF, NYSE, ~$5B market cap ¹⁶) is the sole domestic US producer, manufacturing GOES under the TRAN-COR brand exclusively at its Butler Works facility in Butler, Pennsylvania. No other US facility produces high-permeability electrical steel. Global suppliers include Nippon Steel (Japan), JFE Steel (Japan), POSCO (South Korea), and ThyssenKrupp (Germany), but Section 232 tariffs on imported steel raise costs and create procurement friction for US transformer plants.

The recursive constraint is significant: Cleveland-Cliffs announced a $150M electrical transformer production plant in Weirton, West Virginia (partially funded by a $50M forgivable state loan ¹⁷), which would have generated additional demand for GOES from its own Butler Works. The project was cancelled in May 2025, with Cleveland-Cliffs citing the partner’s unwillingness to commit to proper scaling and tariff uncertainty. The cancellation is itself informative: even the sole US GOES producer could not make the economics work for domestic transformer manufacturing, underscoring the structural difficulty of the transformer supply chain. Hitachi’s $457M South Boston plant ⁴⁵, Siemens’ $150M Charlotte plant, and Eaton’s $340M South Carolina plant all need GOES steel. Global suppliers include Nippon Steel and JFE Steel (Japan), POSCO (South Korea), ThyssenKrupp (Germany), and Baowu Group (China). The question the report must answer: does Butler Works have sufficient capacity to supply all these new transformer plants simultaneously, given that imports face Section 232 tariffs? If not, the transformer bottleneck does not actually ease by 2028; it merely shifts from transformer assembly capacity to GOES steel capacity.

The severity of the transformer crisis has prompted federal intervention. In April 2026, the President signed a Defense Production Act Section 303 determination classifying grid infrastructure, including transformers, high-voltage transmission components, and electrical core steel, as essential to national defense. The determination explicitly cited “dangerously limited” domestic capacity and overreliance on imported equipment. The DOE has 90 days to report to Congress on implementation, but specific projects and funding levels have not yet been identified ¹⁹. Meanwhile, operators are finding creative workarounds: Crusoe Energy, building OpenAI’s 1.2 GW Stargate campus in Abilene, Texas, has resorted to refurbishing transformers from shuttered power plants as a stopgap while new manufacturing capacity ramps ²⁰.

Grid interconnection queue (SEVERE): Even with transformers in hand, connecting a new data center to the grid requires approval from the regional transmission organization. PJM’s interconnection queue has 190 GW of pending requests. Processing times of 3-5 years are common. This forces hyperscalers to pursue behind-the-meter generation (natural gas, fuel cells) as bridge solutions, which adds cost and complexity. The grid queue is a regulatory and engineering bottleneck, not a capital one: money cannot accelerate the process (see Chapter 13). JPMorgan (March 2026, Sarah Kapnick) framed the aging US grid as a “national security risk,” projecting approximately $1 trillion in US grid investment over the coming decade ($5.8 trillion globally from 2026-2035), split between transmission (37%) and distribution (63%). The report noted that concentration of critical AI compute load in data centers creates single points of failure that did not exist when the grid was designed ¹⁸.

Switchgear availability (MODERATE-HIGH): Medium-voltage switchgear is required at every data center facility entry point. Powell Industries’ surge in orders (first $75M+ DC megaproject) and Hitachi Energy’s expansion of high-voltage switchgear manufacturing in Pennsylvania indicate that switchgear demand is outstripping supply. Lead times for custom MV switchgear are 40-60 weeks. This is less severe than transformers but still a constraint for projects on aggressive timelines ¹³¹⁴.

UPS scalability for high-density racks (MODERATE): Traditional UPS systems were designed for 10-20 kW racks. AI racks consume 100-500 kW. UPS systems must scale to multi-megawatt capacities while maintaining 99%+ efficiency. Schneider’s Galaxy VXL (scalable to 5 MW) and Vertiv’s OneCore modular platform address this, but deployment at scale is still early. The transition from lead-acid to lithium-ion batteries in UPS systems also introduces supply chain dependencies on the same lithium/battery markets serving EVs ⁹¹⁰.

48V/HVDC transition (MODERATE, emerging): The industry is migrating from 12V to 48V rack-level power distribution, and from AC to HVDC (high-voltage direct current) at the facility level. Schneider’s collaboration with NVIDIA on an 800 VDC sidecar module signals the direction. This transition improves efficiency (fewer conversion stages = less power loss) but requires new power delivery hardware throughout the stack. Companies positioned in 48V/HVDC (Schneider, Vertiv, Delta Electronics) have an advantage; legacy AC-focused suppliers face obsolescence risk ¹⁰.

14.6 Risks

Transformer supply improves faster than expected: Wood Mackenzie projects the power transformer shortfall could fall from 30% in 2025 ³ to 5% by 2030 ¹. If capacity expansions from Hitachi, Siemens, Eaton, and others come online on schedule, the bottleneck eases considerably. A 2028-2030 equilibrium would mean transformer delays shave only 1-2 years from project timelines rather than 3-4. This is the base case, not an upside scenario.

Behind-the-meter generation bypasses the grid: If hyperscalers increasingly build their own on-site generation (natural gas, fuel cells, SMRs), the demand on the grid and on transformers/switchgear is reduced. Bloom Energy’s fuel cell deal with AEP (100 MW, option to 1 GW) ² exemplifies this trend. Behind-the-meter reduces reliance on grid interconnection and large power transformers, potentially making these bottlenecks less binding. The risk transfers to fuel supply and permitting instead.

Power delivery silicon commoditization: Monolithic Power Systems (MPWR) dominates GPU voltage regulators today, but Infineon, Renesas, and Texas Instruments are all investing in high-current power delivery for AI servers. If GPU power delivery silicon becomes a competitive market with multiple qualified suppliers, MPWR’s pricing power diminishes. This is a 2-3 year risk as next-generation GPU platforms redesign their power delivery architectures ¹⁰.

Rate shock and political backlash: If residential electricity rates continue to rise due to data center load (Carnegie Mellon: +8% average US bill by 2030, +25% in high-demand markets) ³, political pressure to limit data center power consumption could intensify. Moratoria on data center construction, special power surcharges, or requirements for self-generation could slow the buildout and reduce demand for grid equipment. Several US states and European jurisdictions are already considering such measures.

First principles check: Why are transformers the bottleneck and not something easier to manufacture? Because large power transformers are among the most complex pieces of industrial equipment in existence. A single unit weighs 100-400 tons, contains thousands of liters of insulating oil, uses grain-oriented electrical steel (GOES) that is produced by only a few mills globally, and must be custom-designed for each installation’s voltage, frequency, and thermal requirements. They cannot be mass-produced on an assembly line. Each unit is essentially a one-off engineering project. This fundamental manufacturing constraint means that even with billions in investment, capacity increases are slow and incremental.