For years, transformer shortages have been discussed as a problem at the industry level, largely caused by long lead times, constrained manufacturing capacity, material availability, and growing demand. In 2026, that focus of that conversation changed.

The federal government has now formally identified transformers, electrical steel, and other critical grid infrastructure as essential to U.S. national defense. That has pushed the transformer supply chain well beyond something only utilities are focused on, making it a national priority.

The reason is pretty straightforward. The U.S. simply cannot build the power infrastructure it needs without also strengthening the manufacturing supply chain behind the transformer.

Transformers Are Now a National Security Issue

On April 20, 2026, the White House issued a Presidential Determination under the Defense Production Act addressing U.S. grid infrastructure and supply chain capacity. The determination identified transformers, electrical steel, substations, transmission components, and other grid equipment as industrial resources essential to national defense. It also pointed directly to several vulnerabilities the industry has known about and been dealing with for years, including:

• limited domestic manufacturing capacity
• long production lead times
• dependence on imported equipment, and
• supply chain exposure

Transformers sit at a critical point in almost every major conversation about U.S. electricity infrastructure. Large power transformers are particularly important. DOE has previously estimated that more than 90% of electricity consumed in the United States passes through a high-voltage transformer at some point. These same units are also highly engineered, difficult to transport, and expensive to replace.

Electricity Demand Is Growing Again

The urgency is increasing because the United States has entered a very different electricity-demand environment. After nearly two decades of relatively flat electricity demand, DOE reports that U.S. load growth has increased at close to 3% annually since 2023.

Few industries reflect that challenge more clearly than data centers. Power availability is becoming one of the defining factors in where and how quickly new data center capacity can be developed. A site may have available land and network connectivity, but without the electrical infrastructure, construction alone isn’t enough to bring a facility online.

That puts transformers directly on the critical path. Large data center developments can require new substations, transmission upgrades, and significant transformer capacity. The same is true for new factories and other large industrial projects.

For transformer manufacturers, that creates demand from two directions. They have to replace and modernize equipment already on the grid, and they also have to supply transformers for entirely new infrastructure. That’s a difficult equation when production capacity and key materials are already constrained.

The Bottleneck Starts Before Final Transformer Assembly

Increasing U.S. transformer output is not as simple as adding another final assembly line. A transformer depends on electrical steel, transformer cores, windings, insulation, tanks, bushings, and numerous other components.

Electrical steel is especially important. Grain-oriented electrical steel, or GOES, is engineered specifically for applications where magnetic efficiency matters and is a fundamental material used in transformer cores.

Transformer cores themselves add another critical manufacturing step. Producing a large power transformer core requires processing electrical steel and assembling those laminations into a core designed to meet the transformer’s electrical and mechanical requirements.

From a supply-chain perspective, if transformer manufacturers increase assembly capacity but upstream suppliers cannot provide enough material, cores, or other critical components, finished transformer production still can’t increase at the pace the market requires.

The U.S. Is Investing in Domestic Transformer Capacity

Federal policy is increasingly reflecting that reality. In August 2026, the DOE announced plans for a program worth up to $375 million to strengthen the domestic supply chain for distribution and power transformers, transformer materials and components, and other critical grid equipment.

The broader goal is to expand U.S. manufacturing capacity, reduce supply-chain vulnerabilities, and improve access to the equipment needed to support the expected grid growth. Although one federal program won’t solve the transformer shortage, it does signal how important transformer manufacturing has become to the country’s larger energy and economic priorities.

What This Means for Large Power Transformer Manufacturers

For transformer OEMs, utilities, and other companies planning future power infrastructure, supply chain strategy is increasingly becoming part of capacity planning. Long lead times mean you can’t source critical components late in a project.

For large power transformer cores in particular, that means considering more than whether a supplier can simply manufacture a core. Experience with large, complex designs matters. So do electrical steel processing capabilities, specialized equipment, production capacity, and the ability to scale alongside transformer manufacturers.

Building Capacity for What Comes Next

The transformer shortage wasn’t created by one issue, and it won’t be solved by one investment. Demand will continue to rise, the grid will continue to age, and the data center boom and large industrial projects will require new infrastructure. Key materials and components will still pass through a relatively concentrated supply chain.

What has changed is the level of attention those challenges are receiving. Transformer manufacturing is now being viewed as infrastructure supporting economic growth, energy reliability, and, importantly, national security. For the companies supplying that industry, the challenge is making sure capacity grows at the same pace as demand.

At Corefficient, that means we’re continuing to invest in the people, equipment, and processes required to support large power transformer manufacturers. Because strengthening the U.S. transformer supply chain ultimately requires strengthening every link that makes transformer production possible.