New data centers are being built across North America at an incredible pace, and the scale of these projects continues to grow. It’s not unusual to see multiple facilities under construction at the same time, each one requiring large power transformers to support continuous operation once they come online.

For transformer manufacturers, the challenge is not only producing more units, but also producing them for multiple projects, all at once, and making sure they perform consistently once installed. As data center demand increases, so does the need for large power transformers and, by extension, the transformer cores that go into them.

Before a transformer ever takes shape, material has to be processed, laminations have to be prepared, and cores have to be built. What’s changing in transformer core preparation isn’t the process itself; it’s how tightly it has to be managed when:

• Multiple cores are being prepared for the same project
• Production is happening across overlapping timelines
• There’s less opportunity to correct issues later

That shift is showing up in a few specific ways.

1.    Greater Emphasis on Coil-to-Coil Consistency

One of the more noticeable shifts in transformer core preparation is the increased emphasis on consistency between coils of material. Even when laminations are produced from different coils of grain-oriented electrical steel, they are expected to come together as part of a single core and perform the same once assembled.

As demand increases, that expectation intensifies. It’s not just about how each coil performs on its own. It’s also about how material from different runs fits together as part of the same build.

In practice, that means:

• Selecting material with consistency in mind
• Sequencing coils intentionally to maintain uniformity across runs
• Evaluating output based on batches, not just within them

Achieving that requires more attention to how material is selected and processed as part of a larger group rather than as individual inputs.

2.    More Focus on Protecting Material Between Steps

An increase in demand means materials move through the preparation process more quickly. This also places more importance on what happens between operations. Laminations are cut, staged, and transferred multiple times before they ever become part of a transformer core. At higher volumes, those transitions happen more frequently and with less time in between, making it important to ensure that the material condition is maintained at every step.

Those transitions are where small inconsistencies can be introduced if they aren’t controlled. That’s why more attention is going into:

• How laminations are stacked immediately after cutting
• How they are stored between operations
• How they are moved across the facility
• The cleanliness of the facility as a whole

These steps have always existed. What’s changed is how structured they’ve become. The goal is to make sure every lamination arrives at the next stage in the same condition it left the previous one.

3.    Coordination Between Teams Matters More

Transformer core preparation sits between several stages of production, connecting material supply, lamination cutting, staging, and final core assembly. Now, these stages are increasingly happening in parallel rather than in a simple, linear sequence. Multiple teams may be working at the same time to prepare laminations for different cores tied to the same data center project, which makes coordination more critical than it has been in the past.

Timing between steps needs to align so that the material is available when it is needed. Additionally, processes must remain consistent across different parts of the operation to maintain data center reliability. This level of coordination helps ensure that cores are prepared in a way that supports uniformity across an entire project.

Where Corefficient Fits In

Corefficient operates at the stage where these factors come together. Preparing electrical steel laminations, managing how material moves through the process, and maintaining consistency across each step are all part of supporting transformer manufacturers as demand continues to increase.

There’s no doubt that the growth of data centers won’t slow down any time soon. The expectations placed on power infrastructure will continue to rise along with it. For transformer core preparation, this means a continued focus on how processes are managed at scale, with greater emphasis on consistency, coordination, and control.

By the time a transformer is installed and energized, the opportunity to influence its performance has already passed. Today, reliability is expected from the start, which means the work done during core preparation carries more importance than ever.