A data center can be built faster than the grid that powers it.
The server building may take a few years. New transmission lines, substations, transformers, and grid connections can take much longer.
The International Energy Agency says cables can take two to three years to procure. Large power transformers can take up to four years. Some direct-current cables can take more than five years.
These delays create demand for manufacturers and contractors. They do not guarantee investor returns.
Scarcity creates opportunity only when a company has the capacity and labor to deliver.
This article follows the grid value chain from transformers and cables to the crews that install them.
Why the Grid Is Slower Than the Data Center
A data center is one large load. The grid is a connected system.
Adding one campus may require:
- a new utility connection
- one or more substations
- large power transformers
- switchgear and protection systems
- high-voltage cables or transmission lines
- engineering studies and permits
- construction and commissioning crews
Many of these products are not standard items waiting on a warehouse shelf.
Large transformers are engineered for a specific voltage, capacity, site, and grid requirement. They use specialized steel, copper, insulation, bushings, and testing equipment.
High-voltage cables also require specialized factories. Subsea and direct-current projects may need dedicated vessels and installation teams.
Construction creates another bottleneck. A utility needs engineers, lineworkers, electricians, operators, and project managers.
Five Companies at Different Points in the Bottleneck
GE Vernova: Grid Equipment and Power Systems
GE Vernova sells generation and electrification equipment. Its grid businesses include transformers, substations, switchgear, HVDC systems, grid software, and services.
In the second quarter of 2026, the company reported total backlog of $176 billion. Data center orders in Electrification exceeded $5 billion during the first half of the year. That was more than twice its total for 2025.
The strong signal is not backlog alone. GE Vernova also reported revenue growth, margin expansion, and strong free cash flow.
Investors should still separate data center demand from the company’s much broader power and grid order book.
Siemens Energy: Transformers, Switchgear, and HVDC
Siemens Energy’s Grid Technologies business supplies transformers, switchgear, grid access systems, and HVDC projects.
In its second fiscal quarter of 2026, Grid Technologies received €7.0 billion of orders and generated €3.1 billion of revenue.
Book-to-bill was 2.28. The segment’s backlog reached €49 billion. Siemens Energy said transformer orders grew strongly, especially in the United States.
The company raised its Grid Technologies outlook to 25%–27% comparable revenue growth and an 18%–20% profit margin before special items for fiscal 2026.
This shows what investors want to see: orders, revenue, margin, and cash improving together.
Hitachi Energy: A Large Backlog Needs a Large Factory Program
Hitachi Energy is a business of Hitachi Ltd. It is not a separately listed global stock.
The company supplies transformers, high-voltage switchgear, grid automation, power-quality systems, and HVDC.
Hitachi said its Energy business expects backlog to remain around 2.5 to 3 times annual revenue. Hitachi Energy’s backlog grew from about $11 billion in 2020 to about $60 billion in 2025.
The company is responding with more than $9 billion of investment across 2024–2027 and more than 40 factory expansion projects.
It also reported data center order growth of more than 150% in fiscal 2025.
This is a useful case study. A record backlog creates visibility, but the investment thesis depends on factory output, delivery time, and execution.
Prysmian: Power Cables and the Digital Connection
Prysmian sells high-voltage power cables, building cables, submarine systems, fiber, and optical cables.
Data centers need both types of connection: electricity and data.
In July 2026, Prysmian announced a long-term optical-cable agreement with Molex worth up to €5.5 billion. The agreement included a €550 million upfront payment.
Prysmian also plans to spend €1.25 billion through 2031 and more than double its U.S. fiber capacity.
The upfront payment matters. It shows that a customer is helping support the capacity needed to meet long-term demand.
The risk is timing. New factories cost money before they generate revenue.
Quanta Services: The Skilled-Labor Bottleneck
Equipment reaches the grid through engineering and construction.
Quanta Services designs, builds, upgrades, and maintains transmission lines, substations, generation connections, and other energy infrastructure.
At the end of March 2026, Quanta reported remaining performance obligations of $26.2 billion and total backlog of $48.5 billion.
The company also reported quarterly revenue of $7.87 billion and free cash flow of $184 million.
Quanta’s definition of total backlog includes remaining performance obligations and estimated work under master service agreements. It is therefore broader than a simple list of fixed contracts.
Its main competitive asset is not a factory. It is its network of skilled workers, engineering capabilities, and operating companies.
The Capacity Test
A large backlog shows demand. It does not prove that the company can deliver.
-
What is being expanded?
Look for a real factory, production line, cable plant, vessel, or workforce program. -
How much capacity will be added?
“Expanding capacity” is weaker than “doubling output” or “adding 5 GW per year.” -
When will the capacity open?
A factory completed in 2028 does not solve a 2026 delivery problem. -
Is the expansion backed by orders?
Customer contracts, reservation fees, or upfront payments reduce demand uncertainty. -
Can suppliers support it?
Steel, copper, insulation, components, and specialized machinery can remain bottlenecks. -
Is labor available?
A new building needs engineers, technicians, and trained craft workers. -
Are prices protecting margins?
Strong demand has little value if inflation and fixed-price contracts absorb the gain. -
Is delivery improving?
Watch revenue growth, on-time delivery, working capital, margins, and cash flow.
Announced capacity is a plan. Operating capacity is an asset.
How to Check Capacity and Lead Times Yourself
Step 1: Open the Official Investor Documents
Use the company’s Investor Relations page. Open the latest earnings release, presentation, annual report, and earnings-call transcript.
Step 2: Search the Right Words
Search for:
capacity,
expansion,
factory,
lead time,
delivery,
on-time,
backlog conversion,
reservation fee,
advance payment,
and skilled labor.
Step 3: Record the Details
| Company | Bottleneck | Backlog signal | Capacity response | What to verify next |
|---|---|---|---|---|
| GE Vernova | Grid equipment and generation | $176B total backlog; data center Electrification orders above $5B YTD | Manufacturing expansion across power and electrification | Segment delivery, margins, and free cash flow |
| Siemens Energy | Transformers, switchgear, and HVDC | Grid Technologies backlog €49B; book-to-bill 2.28 | Product and project execution programs | Revenue growth, profit margin, and advance payments |
| Hitachi Energy | Transformers and grid integration | Backlog about 2.5–3× revenue; about $60B in FY2025 | More than $9B and 40+ factory projects | Output growth, lead-time reduction, and parent-company returns |
| Prysmian | Power and fiber cables | Long-term agreements including up to €5.5B with Molex | €1.25B plan; U.S. fiber capacity to more than double | Factory timing, utilization, and incremental margins |
| Quanta Services | Engineering and skilled construction | $26.2B RPO; $48.5B total backlog | Workforce, acquisitions, and operating-company network | Project margins, labor availability, and backlog definition |
Step 4: Separate Announcements From Operations
Record four dates:
- announcement date
- construction start
- expected completion
- commercial production
A ribbon-cutting is not always the same as full production.
Step 5: Follow Delivery, Not Only Capacity
After the expansion opens, check:
- revenue growth
- backlog conversion
- profit margins
- working capital
- free cash flow
- on-time delivery commentary
What a Healthy Pattern Looks Like
- orders and backlog rise across several customers
- capacity expansion has a clear amount and completion date
- customers provide contracts, deposits, or reservation fees
- revenue rises as new capacity becomes available
- margins remain stable or improve
- cash generation follows delivery
What Should Make Investors Cautious
- capacity announcements have no measurable output target
- completion dates repeatedly move later
- backlog rises while lead times become longer
- factory spending grows faster than expected revenue
- labor or component shortages prevent delivery
- margins fall as the company processes older contracts
The Main Idea
Transformers, cables, and skilled crews are becoming part of the AI infrastructure story.
Their scarcity can create pricing power and long order books.
But a bottleneck is not automatically a profitable business.
Orders show demand. Backlog shows unfinished work. Capacity and labor determine delivery. Margins and cash determine investor value.
Related Articles
- How to Read AI Data Center Equipment Companies
- Who Gets Paid When AI Data Centers Are Built?
- The Hidden Bottleneck of the Electric Age
Sources
- IEA: Building the Future Transmission Grid
- GE Vernova Q2 2026 financial results
- Siemens Energy Q2 FY2026 earnings release
- Hitachi Investor Day 2026: Energy Business Strategy
- Prysmian data center agreements and capacity expansion
- Quanta Services Q1 2026 results
The companies are representative examples, not a ranking or investment recommendation. Backlog and capacity definitions differ by company. Financial data checked in July 2026.