Electrical capacity refers to the maximum electrical load, measured in amps and volts, that a building's electrical service can safely deliver. This determines whether a facility can support a tenant's equipment, three-phase power needs, lighting, and HVAC simultaneously without exceeding safe capacity or requiring costly utility upgrades.
Understanding amps and volts together
Electrical capacity is typically expressed as a combination of amperage (current) and voltage, since power (watts) is the product of the two. A building's electrical service is rated for maximum safe amperage at a given voltage, and tenants need to calculate their total equipment load against this rating, not just check for the presence of adequate-sounding numbers.
Available capacity on paper doesn't always mean available capacity in practice — aging transformers, panels, or wiring infrastructure can underperform their rated capacity, making a professional electrical assessment worthwhile before signing a lease contingent on specific equipment needs.
What to watch for before committing
Total load calculation
Calculate your full equipment load, including lighting and HVAC, against the building's actual available capacity, not just headline figures.
Aging infrastructure performance
Verify aging transformers, panels, and wiring can actually deliver rated capacity, since infrastructure can underperform paper specifications over time.
Upgrade cost and timeline if insufficient
Get a firm cost and timeline estimate from the utility and an electrical contractor if additional capacity is needed.
Shared electrical infrastructure
In multi-tenant buildings, confirm whether electrical capacity is dedicated to your suite or shared with neighboring tenants.
Future capacity needs
If you anticipate adding equipment or automation later, negotiate for spare capacity or confirm upgrade feasibility in advance.
Utility provider coordination
Understand your local utility's process and timeline for capacity upgrades, since this varies significantly by region and provider.
When you need to know this
- Automation and conveyor systems — confirming sufficient capacity for equipment with substantial power draw
- Manufacturing operations — verifying electrical service supports heavy machinery load requirements
- Cold storage and refrigeration — ensuring adequate capacity for compressor and refrigeration equipment
- Evaluating older or converted buildings — confirming existing electrical infrastructure matches modern equipment needs
Frequently asked questions
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