ESTATE-SCALE ELECTRICAL INFRASTRUCTURE
400A, 600A, 800A and 1000A+ service for large homes and estates.
When a custom residence outgrows ordinary residential panel work, service planning becomes an engineering and utility-coordination project. Regent5 evaluates calculated demand, future capacity, utility availability, switchgear, transformers, underground service and resilient-power integration as one system.
BEYOND A PANEL REPLACEMENT
Large estates can require infrastructure that looks more like a central plant than a typical house.
Multiple EV chargers, heat pumps, pools and spas, electric outdoor heaters, elevators, large kitchens, guest houses, server and network rooms, lighting systems, battery storage, generators and future electrification can materially change service demand. The correct service size is determined by project-specific load calculations, diversity, utility conditions and engineering—not square footage alone.
320A / 400A
A common next step above 200A, but still subject to utility capacity, metering, transformer and service-route requirements.
600A
Often requires larger service equipment, distribution planning and more deliberate electrical-room and utility coordination.
800A
Estate-scale service where switchboards, CT metering where applicable, transformer capacity and site logistics can become central design issues.
1000A+
High-capacity infrastructure for unusually demanding residences, compounds or multi-building properties, always dependent on serving-utility engineering and approval.
HOW REGENT5 APPROACHES SIZING
Design the service around the property’s actual load strategy.
Load study
Review HVAC, cooking, EV charging, pools, spas, heaters, lighting, automation, guest structures, elevators, specialty rooms and future electrification.
Utility feasibility
Confirm what the serving utility can support at the property and whether transformer, voltage, phase, route or other distribution work may be required.
Distribution strategy
Coordinate service equipment, switchboards, distribution panels, surge protection, transfer equipment, batteries, generator interfaces and monitoring.
SINGLE-PHASE OR THREE-PHASE
Amperage is only one part of the service decision.
A large residence may remain single-phase or may warrant evaluation of three-phase service depending on available utility distribution and project loads. Regent5 can coordinate the technical evaluation, but no specific phase, voltage or capacity should be assumed available until the serving utility confirms it.
WHAT GETS COORDINATED
Metering, switchgear, transformers, trenching and resilient power all affect the final design.
LOCAL UTILITY REALITY
The serving utility changes the pathway.
For most target Bay Area markets Regent5 coordinates with PG&E. Palo Alto is different: City of Palo Alto Utilities operates the electric utility, so Palo Alto projects should be planned against CPAU service requirements rather than being described as PG&E electric upgrades. Woodside projects may also trigger underground feeder requirements when an upgrade alters the utility-pole-to-service feeder, making trench and conduit planning especially important.
PLAN CAPACITY EARLY
Do not wait until permit or utility review to discover the estate needs a larger service.
Regent5 can support homeowners, architects, builders and owner’s representatives with preliminary load studies, utility coordination, service-sizing strategy and integrated electrical planning.
Start a service-capacity review
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