Why Electrical Capacity Can Make or Break Your Industrial Deal

Whether you’re an owner preparing to lease a warehouse or a tenant looking to expand your operation, electrical capacity is one of the most overlooked—and underestimated—factors in industrial real estate. But it’s also one of the most common deal killers.

Let’s talk about why understanding power matters, even if you’re not an electrician.

The Hidden Delay No One Plans For

Most owners and tenants assume a power upgrade is straightforward until they start looking into it.

That’s when the questions come up:

“Can we upgrade the panel?”
“Will we need to check the conduit or service conductors?”
“Is there enough capacity from the transformer, or would Edison need to get involved?”

What felt like a quick yes can suddenly turn into a 3-9 month process — and by that time, your tenant might be looking elsewhere.

Why Owners Get Stuck Waiting

Most people aren’t trained to recognize electrical limitations. That means they rely entirely on a contractor or electrician to confirm if a building can handle a tenant’s needs.

But here’s the issue:

• Electricians prioritize big installation jobs

• Basic checks (like identifying conduit size or transformer capacity) get delayed

• Your listing sits longer while you wait for answers that could’ve been known upfront

power needs are changing

Industrial users today are more power-hungry than ever:

• Cold storage tenants with 24/7 refrigeration

• EV and battery companies requiring dedicated power infrastructure

• Robotics, automation, and vertical racking systems that spike energy use

And if your building was built in the '80s or '90s for warehousing, your electrical infrastructure may no longer be a fit for these users without upgrades.

What Does “Expandable Power” Really Mean in a Listing?

When a property is marketed as having “expandable power,” it sounds promising but the term is often vague and misunderstood.

What most buyers or tenants assume:

“Great! We can just swap the panel and get more power.”

Here’s what actually determines whether power is truly expandable:

1. Transformer Capacity
   Is the utility-owned transformer sized to deliver more power?
   If not, an upgrade may require coordination with Edison, which can take months.

2. Service Conductors & Conduit
   Are the wires and conduit feeding the panel large enough to carry additional amperage?
   Even a new panel won’t help if the feeder lines are undersized.

3. Panel Rating and Bus Bar
   Is the existing panel capable of handling more amps, or would it need to be replaced entirely?
   If the panel can be swapped, that’s great — but only if the upstream infrastructure allows for it.

Always verify what “expandable” really means — it’s not just about the panel.

three key factors that Determine Your Electrical Capacity

1. Panel Rating (Amps)
   Think of this as your ceiling. A 600A panel is rated for a maximum load up to 600 amps, but under most code conditions, continuous loads are limited to below the full rating. The panel rating alone does not confirm usable capacity.

2. Transformer Size (kVA)
   This tells you how much power is being delivered to the site by the utility. It’s the size of your water tank. The kVA rating determines the total apparent power available at the site. The actual usable amperage depends on both the transformer’s kVA rating and the system voltage.

3. Voltage
   Most industrial buildings run on 480V/277V 3-phase power, which is efficient but must be matched with equipment and panel specs.

Ultimately, confirming electrical capacity requires a load calculation performed by a qualified electrician or engineer. Nameplate ratings alone do not determine available capacity.

What You Can Do (Even If You’re Not Technical)

• Take a photo of the panel label (it shows amperage)

• Locate the on-site transformer and note the kVA rating, but confirm with the serving utility whether that capacity is fully allocated, shared, or expandable.

• If the property has multiple units, check whether the transformer is shared.

• Check conduit size. Larger conduit may indicate the system was designed with expansion in mind, but conduit size alone does not confirm available capacity. Conductor size, load calculations, and utility limits ultimately determine what’s possible.

Bottom Line

Understanding electrical capacity is not just an engineering issue—it’s a leasing issue.

Knowing what your building can (and can’t) support gives you a faster response time, more leverage in negotiations, and a smoother experience for tenants.

Power should be verified before finalizing lease terms or closing, especially for manufacturing or power-intensive operations.

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Originally published March 28, 2025. Updated February 2026 to clarify transformer sizing, load calculations, and expansion considerations.