Power and Substation Planning for Data Centers in San Juan, Texas

Most data center schedules in the Rio Grande Valley will be set by the electric utility, not by the contractor, and a project in San Juan is no exception. We build the shell, the generator and cooling yards and the on-site substation work, and we begin with the interconnection request because a late answer on capacity can move the opening date by months. The request states the load, the phasing and the voltage, and it goes to the utility before the land is purchased.

The city is 8 miles south of Edinburg and 5 miles east of McAllen; Pharr borders it to the west and Alamo to the east. That position matters to a buyer because the same transmission and distribution network serves several of the neighboring cities, and the utility can compare a request in San Juan with others nearby. We prepare a one-line diagram, a load ramp and a site plan so the utility has what it needs to study the request.

This page explains the permits, the industries, the delivery schedule, the cost drivers and the scope we would plan for a San Juan project.

A large electrical load brings several approvals. The utility reviews the service request and the substation design, the local building department reviews the construction permit, and the fire marshal reviews generator fuel storage and life safety. We build a permit matrix that lists each reviewer, the documents they need and the date the approval must be in hand.

Substation work adds its own steps. Pad grading, grounding grid, foundations and fence must follow the utility standard, and the utility often inspects before it will energize. Our utility substation site work package is written to those standards, and we schedule the electrical trade partners and the utility crews in the same plan.

Utilities and power developers need construction partners who understand interconnection. We plan and build yards that step down voltage, on battery storage next to a data hall and on service entrances that tie a campus to the grid. The utilities and power developers page describes what we coordinate.

Colocation and enterprise operators care about the same date for a different reason: a lease or a product launch depends on it. We give them a power timeline with named milestones, such as the study result, the deposit, the long-lead equipment release and the energization test.

We lay out the schedule as two tracks that must meet. One track is the utility: studies, agreements, equipment delivery and its own construction. The other is ours: grading, foundations, shell, electrical rooms and cooling. The meeting point is the day the building can accept power, and we work back from it.

If the utility can provide only part of the load at first, we phase the building so that the first hall opens on the early capacity. Later halls are rough-ready, with their pads, conduits and pipe stubs in place, so energization of the next block does not require demolition.

The largest items are usually electrical gear and the interconnection itself, followed by cooling plant and the shell. Utility contributions in aid of construction, substation equipment and transformer lead time can outweigh the building cost. We show those items on their own lines in the estimate so an owner can see which are firm quotes and which are allowances.

Site conditions affect the number as well. The city covers about 11.64 square miles at an elevation near 105 feet, so drainage depends on gentle slopes and on detention capacity. We include stormwater and detention in the early budget, because the pond can take more land than expected.

Two interstate exits, at Veterans Boulevard and FM 1426, serve San Juan, and the center of town sits south of the interstate and east of US 281. Equipment from the Gulf ports and from the rest of the state can move along the interstate, and the exits give a short last leg to most parcels.

The big stack interchange joining Interstate 2 with I-69C and US 281 is in neighboring Pharr, and in August 2019 a contract started to give each of its four direct connectors a second lane. Work on interchanges changes lane closures and detours, so we check current traffic control plans before scheduling an oversize move, and we compare the route with options through Pharr and McAllen.

The shell is the part of the project the owner can see, and we build it so that interior fit-out can proceed in stages. Our data center shell and core scope covers foundations, the slab, walls and roof, the electrical and mechanical rooms and the loading area. Tilt wall, precast or steel framing can suit the site, and we compare them on schedule and on the available trade partners.

We supervise the concrete, steel erection and roofing partners, and we inspect each stage against the drawings before the next trade starts. Flatness, waterproofing and roof penetrations are checked early, since a leak above an electrical room is costly.

A San Juan project draws labor and suppliers from nearby cities. Trades, rental equipment and inspectors are drawn from the whole central Valley, so we set one coordination calendar that covers sites in San Juan and in Edinburg. We also compare power and fiber options across the cities for an owner who is still deciding between sites.

The same applies to fiber. Because the utility and the carriers cross city lines, a parcel just across a boundary can have a different timeline. We ask for the study result by parcel before recommending one, and we keep a record of each answer so the choice can be explained to lenders, tenants and the board.

Share the megawatts you need, the dates that matter and any parcel in mind. We will outline the interconnection steps and the construction schedule that fits them. See also the planning notes on long-lead equipment procurement.

How soon should I submit an interconnection request in San Juan?

As soon as you know the approximate load and the parcel. The utility study sets the schedule for the whole project, so an early request protects your opening date even if the building design is not final.

Can the first hall open before the full power is available?

Yes, if the utility can deliver part of the load first. We phase the electrical and cooling plant so the first hall runs on the early capacity and later halls are prepared but not energized.

Who pays for a new substation?

It depends on the utility rules and the agreement. Some costs are paid by the customer, some are refunded over time and some belong to the utility. We help you read the terms and carry the numbers in the budget.

Do roadway projects nearby affect deliveries?

They can. Lane closures and detours near interchanges change when an oversize load can move. We review current plans and book the route and escorts for the delivery window.