A mobile substation buyer for complete units and whole lots
We buy single mobile substations or whole lots, any brand, whether they are working, out of service or failed. That includes new surplus equipment that never entered service and retired units that no longer fit an owner's operating plans. Tell us what is included with each package and what, if anything, has been removed.
Our yard and office are at 6402 McGrew St, Houston, TX 77087, and we buy statewide. Utility and co-op staff, facility owners, electrical contractors and project managers can call or text (951) 403-5738 or email Industrial832@gmail.com. You can also send your equipment details for an offer.
A complete package needs more than a transformer nameplate to describe it accurately. Include the trailer, switching equipment, controls, cooling equipment and loose accessories in your photos. If you have several units, label the photos by unit so each rating and condition can be matched to the right equipment.
Mobile substations sizes we buy
How to identify a mobile substation
A mobile substation typically combines a trailer mounted transformer with high- and low-side breakers or switches. The high side receives the incoming higher voltage; the low side supplies the lower outgoing voltage. These packages are used for emergency restoration and planned outages, allowing temporary service while permanent equipment is unavailable.
The trailer and integrated electrical equipment distinguish a mobile package from a conventional stationary installation. A transformer being shipped on a flatbed is not necessarily a mobile substation. Look for a dedicated trailer, installed switching equipment, control cabinets and connections arranged for temporary deployment.
A stationary substation transformer may have a similar electrical rating without the mobile package. A unit substation generally combines a transformer with connected switching or distribution equipment but is not necessarily trailer-mounted. If the equipment's identity is unclear, send overall photos and the nameplates rather than trying to classify it yourself.
Mobile substation sizes and voltage arrangements
Mobile substations commonly offered in this category range from 5 MVA to 50 MVA. MVA means megavolt-amperes, a measure of transformer apparent-power capacity; 1 MVA equals 1,000 kVA, or kilovolt-amperes. We buy units throughout that range, including 7.5 MVA mobile transformer equipment, 10 MVA transformers and 20 MVA transformers.
Dual or multiple high-side voltages, such as 69 kV and 138 kV, are important features to document. Multiple low-side voltages also matter because they describe the service configurations the package can support. Send every listed voltage combination, not just the voltage used during the unit's most recent deployment.
Photograph the transformer plate and separate plates on breakers, switches and other major components. Include impedance, the nameplate value describing electrical opposition that affects voltage regulation and fault current. If capacity changes with cooling mode, include those ratings too; ONAN means oil-natural, air-natural cooling, while ONAF adds forced-air cooling with fans.
New surplus, used, retired and failed equipment
A used mobile substation does not need to be operating when you contact us. We buy working equipment, retired packages and failed units. Explain whether the unit was removed during a planned replacement, held as a reserve, left over from a project or taken out of service after a fault.
Utilities and co-ops retire or replace mobile equipment on their own schedules. Large industrial sites may sell after a service change, plant shutdown or replacement project. Contractors and project owners may also have surplus packages after temporary power requirements end. Those circumstances help explain the equipment's history without substituting for its actual condition.
We coordinate purchases across Texas, including Amarillo, Laredo, Houston, Dallas, San Antonio, Austin, Fort Worth and Corpus Christi. Whether the package is at a utility yard, industrial site or contractor storage area, provide its current location and who controls release of the equipment. Identify any components that belong to someone else or are excluded from the sale.
What drives the offer on your mobile substation
The offer depends on the equipment and the practical details of moving it. Rating, voltage flexibility, age, brand and condition all help describe the package. The available records and included accessories also matter. Our guide to used transformer value explains why equipment details are more useful than a general description.
Send existing electrical test reports and maintenance records, including DGA if available. DGA means dissolved gas analysis, an oil test used to help assess internal transformer condition. Also provide documented PCB status; PCBs are polychlorinated biphenyls, substances historically associated with some electrical insulating fluids. Report what the records show rather than guessing from age.
List included breakers, switches, control cabinets, cooling fans, cables, bushings and spare parts. Note damage, leaks, missing components or known operating problems. Quantity, location and load-out access affect the offer too: a complete unit parked near an accessible gate presents different freight considerations than one stored behind other equipment.
Exactly what to send for a quote
Start with clear nameplate photos, overall photos, quantity, location and condition. A readable plate lets us assess the actual ratings instead of relying on a description such as big mobile unit. Use the transformer nameplate reading guide if you need help locating the useful fields.
For a more complete equipment assessment, send the following information together. If a record or measurement is unavailable, identify the gap and send what you have.
- Equipment identification: transformer and major component nameplates, brand, year if listed, MVA ratings, primary and secondary voltages, impedance and available cooling ratings.
- Package photos: all sides, trailer, axles, tires, hitch or coupling, switching equipment, controls, connection points and any visible damage or leaks.
- Condition and records: operating status, reason for retirement, known failures, missing accessories, existing test reports, maintenance history and documented PCB status.
- Transportation details: available weight and dimensions, axle ratings, trailer condition, DOT inspection history and whether the unit has been moved recently. DOT refers to Department of Transportation.
- Sale and site details: unit count, exact pickup address, included and excluded items, site contact, gate restrictions, access limitations and available load-out support.
Pickup and freight for trailer-mounted equipment
Mobile substations are built to be road-legal, but that does not establish that a particular retired unit is ready to tow today. Axle ratings, tires, brakes, trailer condition and inspection history matter. Provide available transport records so the freight plan reflects the package's present condition, not just its original design.
Disconnection and de-energizing stay with the seller or the seller's qualified electrical contractor. We coordinate trucking, pickup and load-out with the seller. Describe the route from the storage position to the exit, including tight turns, soft ground, overhead restrictions and any obstacles that could affect movement.
We confirm the price, how payment is made and the pickup arrangements in writing before loading starts. The agreed plan should identify the equipment being released, its location and how load-out will be handled. Do not assume that the installed trailer removes the need to check dimensions, weight and access.
Start with the equipment you have
To sell a mobile substation, send the package details before arranging a move. A few clear photos and an accurate condition summary give us a practical starting point. For multiple units, a simple inventory paired with labeled photos helps keep the equipment information organized.
As a portable substation buyer based in Houston, Texas Transformer Buyers evaluates equipment from sellers anywhere in Texas. Call or text (951) 403-5738, or email Industrial832@gmail.com with your nameplate photos and site information. Once we have reviewed the details, we respond with an offer.
Frequently asked questions
Will you buy a mobile substation with blown fuses or missing elbows?
We buy failed and incomplete equipment as well as working units. Identify blown fuses, missing elbows or other missing connections and send close-up photos. Elbows are separable insulated cable connectors used on some equipment; tell us which connection parts are included rather than assuming the package is complete.
Can I get an offer without test reports?
Yes. Send the nameplates, overall photos, quantity, location and known condition, and tell us that test reports are unavailable. Existing reports help describe the equipment, but you can start the offer process without them. Include any maintenance records or documented oil information you do have.
How heavy is a mobile substation?
Weight varies with transformer rating, trailer design, switching equipment and accessories. Use documented package weight, drawings or transport records when available; transformer weight alone may not describe the entire load. Send overall dimensions and axle information as well so freight planning is based on the actual package.
Does the trailer have to be ready to tow?
Tell us its actual condition before pickup is planned. A damaged trailer or uncertain inspection history needs to be considered when coordinating freight and load-out. Send photos of the tires, axles and coupling, plus available inspection records, rather than assuming it can travel as it sits.
Can you buy just one retired unit from a utility yard?
Yes. We buy single units and whole lots, including retired equipment. Send the unit's ratings, photos, location and condition, and identify the accessories included in the sale. Also describe yard access and the site contact responsible for coordinating release and load-out.