The electricity existed.

The customers wanted it.

But moving enough power from one part of the grid to another became increasingly expensive.

In the first half of 2026, PJM grid congestion costs reached $6 billion, according to its independent market monitor. That was 43% higher than a year earlier.

8,920 Transmission Constraints

PJM serves around 67 million people across a large part of the eastern United States.

During the first six months of 2026, its 500 kV transmission system hit or exceeded operating limits during 8,920 five-minute periods.

A year earlier, that number was only 1,865.

Severe weather contributed to some of the congestion, while Northern Virginia—home to one of the world’s largest concentrations of data centers—was among the areas experiencing growing transmission pressure.

More Generation Does Not Automatically Mean More Usable Power

Building another power plant does not solve every electricity problem.

Power still has to travel through transmission lines, substations, transformers, switchgear and distribution networks before it reaches the final load.

If one section of that chain cannot handle the required power flow, electricity may be available somewhere on the system while becoming difficult—or expensive—to deliver somewhere else.

Generating electricity is only part of the job. The grid must also be able to transmit, transform and distribute it.

The Same Principle Applies to a Factory

An industrial project is obviously much smaller than PJM.

But the engineering logic is similar.

A factory may have enough power available from the utility but still be unable to expand production if its transformer, Mv Switchgear, cables or downstream distribution system cannot support the additional load.

A larger transformer alone cannot solve an undersized switchgear or cable problem.

Likewise, new production equipment should not simply be connected without checking load growth, short-circuit levels, protection requirements and future expansion.

Why PJM Grid Congestion Cost $6 Billion

PJM’s real-time wholesale electricity cost increased from about $20.4 billion in the first half of 2025 to $29.4 billion in the same period of 2026.

Transmission-related price adjustments rose from around $2.1 billion to $6 billion.

PJM’s market monitor argues that some congestion costs have also been influenced by the way transmission limits are calculated, while PJM disputes parts of that analysis.

Whatever the market debate, the broader engineering issue remains: rapidly growing electricity demand is putting increasing pressure on the infrastructure between generation and the customer.