AI · HPC · colocation · bitcoin mining
J&J supplies transformers and generation equipment for AI, hyperscale and colocation data-center projects. Start with your required net MW, utility and distribution voltages, redundancy plan, power factor, operating duty and energization date. Compare GSU and substation transformer records alongside diesel generators, natural gas generators and turbine packages; package rating and frequency must match the actual site design. Tommy coordinates specifications, pricing and current written availability.
J&J Transformers LLC · Sugar Land, Texas · Serving projects nationwide
Tommy Marco · tommy@jjtransformers.com
Current transformer listings
Start with the public ratings below. Call or email Tommy for current availability, pricing, photos and the technical package. Each unit needs project-specific engineering review and remains subject to prior sale.
For hyperscale data centers, utilities and EPC teams, J&J reviews high-MVA and high-kV transformer requirements with phased quantities and current equipment records. Include downstream padmounts and dry types from 500 kVA upward, medium-voltage switchgear and breaker schedules when you need a coordinated electrical equipment quote. Large power-transformer delivery is confirmed against the actual unit and release scope.
Identify the utility-side transformer group separately from campus distribution and onsite-generation GSUs. For several units, send the MVA and voltage schedule, acceptable condition, redundancy arrangement and required arrival date for each phase.
Separate utility energization, distribution transformers, standby power, prime/bridge generation and interconnection equipment. A generator fleet's nameplate MW is not the same as dependable net site capacity. Reconcile auxiliary loads, site derating, maintenance, fuel, permitting, frequency and redundancy with the responsible project team before assigning equipment to an energization phase.
Calculate MVA from electrical load and power factor, estimate three-phase current at your voltage, and email the assumptions with your equipment requirement.
J&J helps data-center owners, EPCs and procurement teams find utility-side substation transformers and campus distribution equipment. Onsite generation can also require a GSU. The project's one-line and engineering requirements determine the equipment fit.
| Power-path stage | Typical equipment | Key inputs |
|---|---|---|
| Grid interconnection | Utility yard, substation power transformer, breakers, relays, metering | POI voltage, utility criteria, MVA, fault duty, BIL, impedance, protection |
| Onsite generation | Engines or turbines, electrical generators, GSUs, auxiliaries, controls | Net MW, duty, fuel, emissions, generator MVA/voltage, operating mode |
| Campus MV | MV switchgear, bus, feeders, sectionalizing and grounding | 13.8/34.5 kV or project voltage, topology, N/N+1/2N, fault/arc studies |
| Load blocks | Pad-mounted or dry-type transformers and LV gear | kVA, secondary voltage, harmonics, impedance, efficiency, sound, fire/location |
| Continuity | Standby generators, UPS, storage, black-start and transfer controls | Critical load, ride-through, start sequence, runtime, redundancy and maintenance |
Separate the first transformer delivery from the complete campus requirement. List the MVA and quantity needed for each substation phase, then the kVA and quantities for downstream pad-mounted units. A delivery date and an energization date are separate project milestones.
They are not selected by MW alone. Convert the approved load basis to MVA, then define whether the figure is IT or total-facility load, power factor, redundancy, utilization, load blocks, UPS topology, harmonics, motors, future growth, fault duty, impedance, losses, ambient, altitude, spares, and maintenance isolation.
For illustration only, 100 MW at 0.90 power factor equals 111.1 MVA before redundancy, design margin, growth, auxiliary load, or transformer derating. That arithmetic does not choose the count or size. The one-line determines whether capacity is concentrated in main substation units or divided among campus and building blocks.
A utility-interconnected campus receives power through an approved point of interconnection and campus transformation. Behind-the-meter generation produces power on the customer side of the revenue meter and may operate grid-parallel, islanded, or in another approved mode. Many campuses use both; neither path eliminates permitting, protection, reliability, fuel, or study work.
| Topic | Grid interconnection | Behind the meter |
|---|---|---|
| Capacity source | Utility or market system | Customer-side engines, turbines or other generation |
| Transformer focus | Substation/interconnection and campus distribution | Generator step-up, auxiliaries and campus distribution |
| Approvals | Utility/interconnection, studies, land and construction | Air, fuel, AHJ, operating mode, interconnection if parallel, construction |
| Schedule risk | Network upgrades, transformer/breaker supply, utility milestones | Equipment completeness, permits, gas/fuel, BOP, commissioning |
Freeze voltage levels, MVA/load blocks, frequency, grounding, fault duty, BIL, impedance targets, protection zones, generator and utility interfaces, cable/bus terminals, controls/communications, footprint, access, ambient/altitude, sound, cooling, fire/environment rules, tests, document schedule, and energization milestones before treating a quote as comparable.
Yes. J&J accepts one coordinated request while keeping each OEM, serial/model, battery limit, warranty provider, price, availability, freight basis, and risk visible. A package is not represented as single-manufacturer equipment unless that relationship and scope are documented.
Availability is subject to prior sale, technical review, and written confirmation by J&J Transformers LLC.
Review original photos and confirmed equipment details from J&J's completed transformer sales. These historical units have sold; current requirements are reviewed against the equipment offered today.
Keep the utility transformer, downstream distribution blocks and any onsite-generation connection distinct in the one-line. Group padmounts by complete configuration and state switchgear voltage, bus current, fault duty and lineup scope. Compare technical interfaces and delivery phases across the package before placing equipment orders.
For new manufacturing, J&J can quote Eaton pad-mounted and dry-type transformers up to 10 MVA / 10,000 kVA, medium-voltage switchgear, switchboards, breakers, busway, unit and prefabricated substations, and UPS systems. The 9-week total delivery window covers all listed OEM equipment through arrival at your site. Freight, import clearance and applicable import duties are included in the confirmed delivered quotation; the firm order schedule is confirmed in writing.
J&J quotes dry-type transformers, main-tie-main switchboards, 800 amp distribution busway and UPS equipment as defined project requirements. Send the approved one-line, route drawings and load/runtime requirements together, with quantities and delivery phases for each equipment family.
Specify the incoming utility or plant-bus voltage, the required output bus, continuous MVA and normal/contingency arrangement. Include the one-line, grounding, protection, installation interfaces and required site date. Generation or collector duty does not itself approve a candidate for supplying a project load in step-down operation.
For this project, define utility service, step-down substations, campus distribution, standby generation and UPS interfaces. Send the one-line and a schedule of transformer, generator, turbine, switchgear, breaker or UPS requirements rather than combining unlike equipment under a single MW figure.
Written quotes and supporting records control unit-specific ratings, availability, condition, price, and delivery.
J&J supplies large substation transformers and pad-mounted transformers for project requirements. Email each equipment group with its MVA or kVA, voltages, quantity and delivery phase. Availability is confirmed separately for the proposed units.
MW and MVA are different quantities. Transformer selection depends on the defined facility load, power factor, redundancy, operating margin and project conditions. The project engineer determines the required MVA and number of transformers.
Yes. Include the required winding connections, grounding and tertiary requirements. J&J can screen public listings and additional equipment options against that specification; each proposed unit requires engineering review.
Call Tommy Marco at 346-276-9540 or email tommy@jjtransformers.com. Specifications, reports, photos and pricing are shared directly after contact, according to the records available for the proposed unit. Availability remains subject to prior sale and written confirmation.
Requirements may include interconnection and distribution transformers, switchgear, generators, controls, protection, UPS/storage and onsite-generation equipment.
J&J accepts coordinated package RFQs while identifying each equipment source, technical interface, commercial boundary and warranty provider.
It is the project’s complete path to permitted, commissioned, reliable electrical capacity by the required date.
From the approved load basis, power factor, redundancy, block size, harmonics, growth, losses, impedance, fault duty, site and utility requirements.
Potentially, after permits, fuel, emissions, operating mode, protection, distribution, reliability, commissioning and interconnection issues are resolved.
They describe capacity/topology philosophies. The owner and engineer must define the exact failure and maintenance cases.
Yes. Send initial and planned MW, transformer kVA or MVA, voltages, load-block quantities, site and required date. J&J can search beyond public listings; the project engineer must approve the candidate for its actual load and operating duty.
One-line, MW by phase, load basis, voltage levels, redundancy, site, first-power/energization dates, fuel and known utility constraints.
J&J is presented as a power-equipment supplier, not the project engineer of record. Licensed project professionals approve the design.
Availability is subject to prior sale, technical review, and written confirmation by J&J Transformers LLC.
