Power is the one utility an industrial owner cannot improvise later. Once a slab is poured and a yard is paved, adding a conduit means cutting concrete, and a second chance at a duct bank under a truck court costs several times the first. We install underground electrical systems so that capacity, spare conduits and future routes are decided before the first trench opens, not after the first change request.
A duct bank is a group of conduits laid in a trench, spaced and supported, then encased in concrete or buried in controlled backfill. It carries primary and secondary feeders from the utility to transformers, switchgear, motor control centers and distribution panels, and it often shares a corridor with communications and fiber conduits. We build these runs for small plants, shops, hangars and service buildings, and for larger expansions with heavier loads.
We work alongside licensed electrical contractors and the serving utility. Our role is the civil side of electrical: the trench, the pipe, the concrete, the pads, the vaults and the records.
Most of the surprises we see are not electrical at all. They are a trench that crosses a gas line nobody marked, a pad that sits on soft fill, or a duct that sags between supports and traps water. Careful layout, bedding and compaction prevent those problems, and they are things a civil crew can control.
What we coordinate closely
We excavate to depth and line, set bedding, install conduit with spacers, pour or place encasement concrete with the required color and strength, compact backfill, and set pull boxes, handholes and transformer pads. Crews are trained to keep conduit clean, capped and swabbed, so that cable pulls go smoothly on the first try.
We leave the energized work and cable installation to the licensed electrical contractor, but we coordinate the sequence so conduit, pull boxes and pads are ready when they arrive. Mandrel tests prove each conduit run is open, and a pull string stays in each one for the electrician. That tidy handoff is what most owners notice first.
Spare duct is capped with a visible marker, and the position of every pull box is tied to survey control, so a later electrician can find it without a metal detector. We hand over a marked-up drawing and a set of photos, indexed by station, for the closeout binder.
Elements of the underground electrical package
The package usually starts at the utility connection point, which may be a pole, a pad-mounted transformer or a vault. From there, ducts run to the main service equipment, to subpanels, to yard lighting poles, to gate operators and security equipment, and to any outbuildings. Where the site includes a rail spur or a yard with trailer plug-ins, additional runs are routed to those locations.
We include spares in the design wherever possible. An extra two or four conduits cost little during construction and save very large amounts when the next machine or charger is added. Pull boxes are sized for the cable and bend radius, and we place them where they will not be driven over by loaded trucks unless they are rated for it.
Power and the northern New Mexico supply line
Electrical demand across the region comes from many directions, and the lab supply chain is one of them. Los Alamos National Laboratory is the largest employer of Espanola residents at over 12% of employment, so shops and suppliers in Espanola, Pojoaque and Santa Fe often serve equipment-heavy work with real electrical loads. A small business near the Santa Fe Regional Airport or in the Agua Fria area may find its electrical service is sized for retail use and has to be upgraded for light industrial loads.
Utility lead times for transformers and service upgrades are often the longest item in the schedule. We start those requests on day one, and the duct bank design follows the utility's standard sections, so the work is ready when its equipment arrives.
North of the city, the pattern changes. The interchange at Pojoaque on US 84/285 connects to NM 502, the main access route to the laboratory, and businesses along that corridor tend to be small, specialized and power-hungry. Long runs in rocky or sloping ground are common, and we plan equipment and a rock allowance accordingly.
What drives the price
Length and depth are the first cost factors, followed by crossings. Crossing a road, an arroyo, a drainage channel or another utility adds complexity, particularly if the crossing needs boring instead of open trench. Concrete encasement adds cost compared with direct burial, but is often required for primary conductors, under pavement or where future excavation is likely.
Voltage matters, since medium-voltage ducts require larger bends and special handling. Rock changes everything, because trenching through rock is slow. We carry an allowance when soil reports suggest it and report quantities as the work proceeds. Choosing the shortest safe route usually saves more than any change to the materials.
Utility charges belong in the budget too. Line extensions, transformer fees, and any contribution to utility capacity can be a large share of the electrical cost, and they are separate from our work. We ask for those figures early and show them beside the construction cost so that you see the whole price.
Codes, coordination and records
The state's electrical code is the 2020 New Mexico Electrical Code, adopting the 2020 National Electrical Code as amended, and it applies to burial depths, conduit types, marking tape and pull box construction. We follow the plan's depths and verify them with measurements before we cover. Permits for electrical work are issued under the new rule, as the transition period ended in September 2023.
Coordination with the site utilities package is critical, because water, sewer and storm lines compete for the same corridor. We resolve crossings on the combined plan. For yards that will also carry lighting and security, see yard lighting and electrical site work, and for owners with long equipment orders, our long-lead procurement management service tracks the gear that will land on these pads.
Where the building houses sensitive equipment, such as in a data center support building or an instrument lab, we discuss redundant feeds and separate routes for primary and backup power. Two ducts in the same trench protect against a utility failure but not against a backhoe, and the better answer is often two physically separate routes.
Tell us what the site needs to power
Share your expected loads, the utility service point and the building location. We will outline a duct bank layout, a price range and the utility steps that set the schedule.
Common Questions
Why concrete-encase the duct bank?
Encasement protects conduit from heavy loads, future digging and settlement. It is typically required under paved areas and for primary conductors. The extra cost buys long-term reliability and easier future work.
How many spare conduits should we install?
A common rule is to add spares of the same size as the largest feeder or at least a few communication-sized conduits. We discuss your growth plans, then recommend a number. Adding spares during the initial trench is far cheaper than opening pavement later.
Who coordinates with the electric utility?
We handle the civil coordination, such as trench routes, pad locations and inspection, and your electrical contractor or engineer handles load letters and billing. We keep both informed so decisions do not stall.
Can you bore under roads and drainage channels?
Yes, we use horizontal boring subcontractors for crossings where open trenching is not allowed or not practical. Bore pits and receiving pits must be planned, and we show them on the sequence.
How do you protect the conduit before the cable arrives?
Open ends are capped, runs are proved with a mandrel and left with pull strings. We also photograph and survey before backfill. These steps reduce problems during cable pulling and protect the warranty.
Does the work connect to industrial demand in the region?
Yes. Suppliers to advanced manufacturing and utilities and power customers often need reliable, high-capacity service. We tailor the duct bank to those demands.