High Voltage Contractors in Wisconsin.
Substations, transformers, and medium-voltage systems for utilities and facilities that cannot afford downtime.
WIL-Surge Electric is a high voltage contractor for public and private utilities and for facilities that cannot afford downtime. We design-build and maintain high voltage systems, including substations, transformers, medium-voltage switchgear, and distribution, with licensed, in-house crews.
Substations & Transformers
As a substation electrical contractor, our licensed crews construct and service substations, transformers, and medium-voltage switchgear. Substation work includes grounding, relay testing, and utility interconnection, so a station is built, protected, and tied to the grid the way the design intends.
Transformers step power down from utility service to the voltages a facility uses. We set, connect, and service them as part of the same scope, keeping the substation and the distribution system downstream under one accountable team.
Medium Voltage Systems
Campuses, plants, and large public facilities often distribute power at medium voltage before stepping it down building by building. As a medium voltage contractor, we build and maintain that distribution, from switchgear to feeders, for facilities where a lost circuit means lost operations.
Distributing at medium voltage lets power travel longer distances on smaller conductors with less loss. Many campus systems add a loop or a second feed so a building can be switched to another source when one cable or transformer needs service, which keeps maintenance from turning into a shutdown for the whole site.
Utility coordination is part of the work. We coordinate with public and private utilities on interconnection, outages, and power delivery infrastructure, so the handoff between the utility and your system is planned instead of improvised.
Design-Build & Maintenance
We design-build high voltage systems for new facilities and maintain the systems already in service. Downstream, our power distribution crews install the switchgear, distribution equipment, and standby power that carry that capacity through the building.
Design-build keeps high voltage decisions connected to the rest of the project. Station layout, transformer sizing, and feeder routing are planned with the loads downstream in view, so the equipment at the service matches what the facility actually uses. For systems already in service, upgrades are planned around the equipment that is there, its age and condition, and the outages the operation can tolerate.
Medium-voltage cable work deserves particular care. Terminations and splices have to be made cleanly and correctly, because a flaw at one connection can take down an entire feeder. Cable routes, whether underground or overhead, are planned to protect the cable and to leave access for future maintenance.
Safety Around High Voltage
High voltage work leaves no room for shortcuts. Our crews train to NFPA 70E, and we perform NFPA 70E arc flash studies, labeling, and mitigation planning for owners' facilities. See how our safety program protects crews and the people around them.
At higher voltages, safe work starts with planning. Switching is performed from written procedures, equipment is verified de-energized and grounded before anyone works on it, and the boundaries around energized parts are set before a job begins. Accurate one-line diagrams and current labeling make every one of those steps more reliable.
Planning a High Voltage Project
High voltage projects run on longer timelines than most electrical work, so planning starts early. Utility service requests, interconnection reviews, and equipment procurement can each take months, and large transformers and medium-voltage switchgear often carry some of the longest lead times on a project. Ordering decisions made during design protect the construction schedule later.
The site matters as much as the equipment. Substations and pad-mounted transformers need a suitable foundation, a grounding system designed for the installation, cable routes to the loads they serve, and access for delivery trucks and cranes. Owners should also think about growth: planned expansions, added process loads, EV charging, or battery storage can change how much capacity a new station or service should be built to handle.
For existing facilities, outage windows are often the tightest constraint. Planning when and how long power can be down, and what has to stay running in the meantime, shapes the sequence of the entire job. Temporary power, backup sources, and staged cutovers are all tools for keeping critical operations running through the work.
Testing, Energization & Long-Term Reliability
Before a high voltage system is energized, it is tested. Grounding is verified, protective relays are tested so they trip when they should, and cables and equipment are checked for installation damage that would otherwise surface as a failure under load. Energization then follows a planned switching sequence coordinated with the utility where the interconnection requires it.
Once a system is in service, maintenance keeps it dependable. Periodic inspections, cleaning, connection checks, and relay testing catch wear before it becomes an outage, and records from each visit show how equipment is trending over time. For utilities and facilities that cannot afford downtime, a planned maintenance approach costs far less than an unplanned failure of a transformer or switchgear lineup.
High Voltage Projects
West Allis DPW Facility
Complete electrical construction for the 310,000+ ft² West Allis DPW campus, including main service and distribution, repair- and wash-bay wiring, and high-efficiency lighting for office, IT, and site infrastructure.
See more of our work in our projects portfolio, explore our commercial electrical services, or see the utilities and power delivery markets we serve.
Plan your high voltage project.
Preconstruction support, budgeting, and design-build expertise, from a partner who self-performs the work.