America has a growing electricity problem.
The country needs more power. But generating more electricity is only part of the challenge.
That electricity also has to get where it is needed.
During the first half of 2026, congestion costs on PJM Interconnection—the largest power grid in the United States—surged to approximately $6 billion, according to PJM’s independent market monitor. That represented a 43% increase as overloaded transmission lines increasingly limited the movement of electricity across the system.
For electrical contractors, this is much more than an electricity-market story.
It points toward a potentially enormous construction opportunity involving transmission lines, substations, switchyards, transformers, protection systems and other high-voltage infrastructure.
The United States is rapidly adding data centers and other large electrical loads.
Now the infrastructure carrying all that electricity has to catch up.
What Is Happening to the PJM Power Grid?
PJM Interconnection operates the high-voltage electric grid serving approximately 67 million people.
Its territory stretches across all or portions of Delaware, Illinois, Indiana, Kentucky, Maryland, Michigan, New Jersey, North Carolina, Ohio, Pennsylvania, Tennessee, Virginia and West Virginia, along with Washington, D.C.
PJM coordinates approximately 88,000 miles of transmission lines across its territory.
That makes what is happening inside PJM especially important.
Problems appearing there could provide an early look at challenges other regions may eventually face.
According to Monitoring Analytics, transmission congestion costs reached approximately $6 billion during the first six months of 2026.
The year-over-year increase was approximately $3.9 billion.
For comparison, the increase in natural-gas fuel costs during the same period was about $2 billion. In other words, the additional cost associated with transmission constraints was greater than the increase associated with fuel.
That is a remarkable development.
Generating electricity is one thing.
Moving it across an increasingly constrained transmission network is becoming another major expense.
What Is Transmission Congestion?
Think of the electrical transmission system like a highway.
A highway may have plenty of cars available to make a trip. But if the road cannot handle the traffic, congestion develops.
The electric grid works in a similar way.
Power plants may be capable of generating electricity. However, transmission lines have operating limits.
When a transmission path becomes constrained, grid operators may not be able to use the lowest-cost available generation to serve customers in another area.
They may have to use more expensive generation closer to the load.
Those constraints create congestion costs.
As demand increases, the problem becomes more serious if transmission capacity does not increase with it.
And demand is increasing rapidly.
500-kV Transmission Constraints Are Sending a Warning
One of the most striking numbers in the latest PJM report involves its highest-voltage transmission network.
During the first half of 2025, PJM recorded 1,865 five-minute periods when 500-kV transmission lines hit or exceeded operating limits.
During the first half of 2026?
8,920.
Many of those violations occurred during a winter storm, according to Monitoring Analytics.
The increase illustrates how quickly conditions can deteriorate when extreme weather and rising electrical demand hit the grid simultaneously.
The economic consequences are also substantial.
PJM’s real-time wholesale cost to serve electricity demand increased from approximately $20.4 billion during the first half of 2025 to $29.4 billion during the first half of 2026.
Average real-time wholesale electricity prices increased from $51.75 per megawatt-hour to $72.54 per megawatt-hour.
The transmission system is becoming a critical part of the power-cost equation.
Data Centers Are Adding Enormous New Electrical Loads
There are several reasons electricity demand is increasing.
Manufacturing is expanding in some regions.
Electric vehicles add load.
Electrification adds load.
Heating and cooling demand continues to grow.
But one category stands above many others:
Data centers.
PJM has said forecast electricity demand from data centers and other large-load customers is growing faster than the ability to build enough new generation to serve those customers.
PJM’s planning data has projected that data-center growth could add as much as approximately 30 GW of electrical demand between 2025 and 2030.
Thirty gigawatts is 30,000 megawatts.
To put that into construction terms, these aren’t ordinary commercial electrical services.
A single large data center campus can require hundreds of megawatts.
That means utilities and developers must think beyond the building.
Where will the power come from?
Can the existing transmission system deliver it?
Does a new substation need to be constructed?
Do existing substations require expansion?
Are new transmission lines required?
Can existing lines be reconductored?
Are new transformers required?
Does additional generation need to be built?
Those questions increasingly determine whether a major project can proceed.
Northern Virginia Shows What Happens When Data Centers Concentrate
Northern Virginia is one of the most important data center markets in the world.
It is also one of the areas being hit hard by transmission congestion.
Reuters identified northern Virginia, metro Baltimore and Delaware among areas experiencing significant PJM congestion.
This matters because Northern Virginia demonstrates what can happen when enormous electrical loads become concentrated geographically.
Data centers may be located relatively close together.
Each requires large quantities of power.
The surrounding transmission network must support those loads.
Eventually, the problem moves upstream.
It is no longer simply about installing another transformer or expanding a local distribution feeder.
The regional transmission system itself may require reinforcement.
That creates a completely different scale of electrical construction.
PJM Is Already Planning Billions in Transmission Improvements
The construction response has already started.
PJM said its Board approved approximately $6 billion of transmission projects in February 2025 to address reliability needs created by accelerated load growth, changes in generation and shifting regional power flows.
And that was only one group of projects.
The Maryland Office of People’s Counsel reported that PJM subsequently approved approximately $11.8 billion of transmission projects in its 2025 Regional Transmission Expansion Plan, following $6.7 billion in its 2024 RTEP.
Those numbers should get the attention of electrical construction companies.
Transmission expansion creates work far beyond the transmission conductors themselves.
Projects can require:
- New transmission substations
- Existing substation expansions
- High-voltage breakers
- Power transformers
- Control houses
- Protection and relay systems
- SCADA systems
- Underground transmission
- Overhead transmission
- Structural steel
- Ground grids
- Station service
- Battery systems
- Fiber-optic communications
- Testing and commissioning
Large transmission programs can also create opportunities for civil contractors, equipment manufacturers, specialty subcontractors and engineering firms.
The Federal Government Says More Transmission Is Needed
This isn’t only a PJM issue.
The U.S. Department of Energy released its draft 2026 National Transmission Needs Study in July.
DOE concluded there is a pressing need for additional transmission infrastructure because of load growth from data centers, domestic manufacturing, large industrial loads and overall economic growth.
That is significant.
Electrical demand had remained relatively flat in many parts of the United States for years.
Utilities could plan around relatively predictable growth.
That environment is changing.
A single proposed data center campus can introduce an electrical load comparable to a small city.
Multiple campuses can transform the load forecast of an entire utility territory.
Utilities then have to determine how generation and transmission infrastructure will support them.
Extreme Weather Makes the Problem Even Harder
The grid must handle more than average demand.
It must survive peak conditions.
That became clear during the July 2026 heat wave.
PJM reached an all-time peak load of approximately 168 GW on July 2, according to Reuters.
During the event, PJM took emergency measures, ordered generators to maximize output and prepared additional actions to maintain reliability. Operating reserves fell sharply as demand climbed.
At one point, the cost of balancing electricity on the system reportedly reached as high as $28,000 per megawatt.
The grid made it through the event.
But the episode demonstrated why utilities cannot simply build enough infrastructure to meet an average day.
The electrical system must be capable of handling extreme conditions.
That requires capacity.
It requires redundancy.
And increasingly, it requires construction.
Electrical Contractors Should Watch the Transmission Market
For many commercial electrical contractors, transmission construction may seem like a completely different industry.
In some ways, it is.
High-voltage transmission and substation work requires specialized expertise, equipment, safety programs and trained personnel.
But the infrastructure expansion can create opportunities throughout the electrical construction market.
Consider what happens when a major data center campus is announced.
A utility may need to build a new transmission line.
That transmission line may feed a new substation.
The substation may require multiple power transformers.
The developer may then construct its own medium-voltage distribution system.
That system feeds multiple data center buildings.
Each building requires switchgear, generators, UPS systems, busway, cable, controls and monitoring.
One large load can create an entire chain of electrical construction projects.
Equipment Demand Could Become Another Major Challenge
Building billions of dollars in transmission infrastructure requires equipment.
Lots of it.
Large power transformers are already experiencing supply-chain pressure.
Switchgear remains critical.
High-voltage breakers, instrument transformers, relays, steel and conductors must all be manufactured and delivered.
That makes procurement increasingly important for electrical estimators and project managers.
On a large infrastructure project, the lowest equipment quotation may not necessarily be the best quotation.
Contractors increasingly need to evaluate:
Price.
Lead time.
Escalation.
Manufacturing capacity.
Approved manufacturers.
Delivery guarantees.
Schedule risk.
A transformer that costs less but arrives 18 months too late can become extremely expensive.
Technology Can Help, But Construction Is Still Needed
The industry is also looking for ways to get more capacity from existing transmission infrastructure.
Dynamic line ratings, advanced grid modeling and other grid-enhancing technologies can potentially allow operators to use existing lines more efficiently under certain conditions.
Reuters reported that technologies from companies working in this area could help reduce congestion without waiting for every new transmission project to be completed.
That could provide valuable short-term relief.
But software cannot eliminate the underlying physical problem.
If electricity demand continues growing by tens of gigawatts, additional physical infrastructure will still be required.
Lines.
Substations.
Transformers.
Switchgear.
Generation.
And the electrical workforce needed to install it.
The Grid Could Become One of Electrical Construction’s Biggest Markets
The most important part of the $6 billion PJM congestion story isn’t the $6 billion.
It is what the number represents.
America’s electrical demand is changing faster than much of the infrastructure built to serve it.
Data centers are accelerating that change.
Manufacturing is adding additional demand.
Extreme weather creates enormous peaks.
Meanwhile, major transmission projects can take years to permit, engineer and construct.
PJM itself says electricity demand from large-load customers is outpacing the ability to build enough generation to serve them.
The Department of Energy says the country has a pressing need for additional transmission infrastructure.
And PJM congestion costs reached approximately $6 billion in only six months.
Put those facts together and the direction becomes difficult to ignore.
The United States needs more power infrastructure.
A lot more.
For electrical contractors, estimators, project managers, engineers and equipment manufacturers, the next major construction boom may not simply be inside the data center.
It may be the massive electrical grid being built around it.
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