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And more equipment at launch.
These tiles show a representative cross-section of what Refound carries. The full searchable catalog will list every spec variant, manufacturer, and form factor at launch.
Refound · Categories
Power transformers, in stock now.
Utility-scale GSU, MPT, auto-transformers, and substation power transformers from 13.8 kV to 345 kV. Verified condition, real test data, North American inventory.
OEM lead times today routinely exceed 128 weeks for power transformers and 144 weeks for generator step-up units, per public US power-sector reporting through 2025. Refound moves verified secondary-market units in 30 days.
Sub-categories
What you can buy on Refound
Generator step-up (GSU)
Pad-mounted and station-class GSUs, 5 MVA to 350 MVA, voltage classes through 345 kV. Used in solar, wind, and BESS interconnect.
Browse on marketplace →
Main power transformers (MPT)
Substation MPTs, 10 MVA to 300 MVA, ONAN/ONAF/OFAF cooling, on-load tap changers (OLTC) ±10% standard. Both delta-wye and zigzag configurations.
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Auto-transformers
Inter-tie autos, 50 MVA to 400 MVA, 138/69 kV through 345/138 kV common configurations. With and without tertiary windings.
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Pad-mount distribution transformers
50 kVA to 5 MVA, single-phase and three-phase, common dead-front and live-front configurations. Repower and DG-interconnect inventory.
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Search by spec
Specifications buyers filter on
Refound's spec-faceted search lets you narrow listings by every spec that matters to your engineering team. We don't make you sort by manufacturer.
| Filter | Range available |
|---|---|
| Voltage class HV | 13.8 · 34.5 · 69 · 115 · 138 · 161 · 230 · 345 kV |
| Voltage class LV | 4.16 · 12.47 · 13.8 · 34.5 · 69 · 115 kV |
| MVA rating | 5 MVA to 400 MVA (per cooling stage: ONAN / ONAF / OFAF) |
| BIL (HV / LV) | 110 kV to 1300 kV BIL HV; 60 kV to 200 kV BIL LV |
| Vector group | Yyn0 · Yd1 · Dyn1 · Dyn11 · YNyn0 · YNd1 (and others) |
| Cooling class | ONAN · ONAN/ONAF · ONAN/ONAF/OFAF · OFWF |
| Tap changer | DETC ±5%, ±2.5% · OLTC ±10% in 32 × 5/8% steps · No taps |
| Oil type | Mineral · FR3 (natural ester) · Silicone · Dry-type |
| Year built | 1990 onward (PCB-cleared); newer-than filters available |
| In-service hours | Range slider; energization date provenance required |
| Location | Filter by ZIP radius (50 / 100 / 250 / 500 / nationwide) |
Why secondary market
Why buy used utility-scale transformers
The OEM transformer market is structurally broken. Public US power-sector reporting puts new generator step-up lead times around 144 weeks, with the largest substation power transformers backed up well past 100 weeks. North American supply deficits are widely documented across industry publications. Project timelines that can't tolerate those lead times have three options: scrap the project, redesign around different voltage classes, or source verified secondary-market units.
Refound's transformer inventory comes from three professional supply channels: IPP fleet rotation (independent power producers cycling units out of operating portfolios as they upgrade or repower; equipment well within useful life), decommissioned project surplus (units from solar, wind, and substation projects that retired early due to interconnection changes, repowering decisions, or asset divestitures), and canceled-project inventory (units ordered for projects that didn't reach NTP due to financing, permitting, or tariff dynamics).
Every unit on Refound passes through the 3rd Party Verified program before earning the badge.
And there's a circular-grid argument that's hard to ignore: a single 100 MVA GSU carries thousands of tons of embedded steel, copper, and processed mineral oil. Re-energizing that unit for another 20-30 years of service is the most material reuse you can do in this industry. The emissions math, the critical-mineral conservation, and the avoided new-build delay all stack the same direction. Toward sourcing verified secondary-market units when they're available.
Free guide
Refound buying guides
How to evaluate a used 100 MVA GSU
A procurement engineer's checklist. What to demand from the seller before bidding, how to read DGA results, what insulation resistance values mean for remaining life, and the nameplate red flags that should stop the deal.
Free to read online or save as a PDF for offline reference.
FAQs
Transformer FAQs
How does Refound verify the test data isn't fabricated? +
3rd Party Verified inspections require date-stamped EXIF photos of the test instruments in use plus inspector signature. Random audits re-test 5% of completed inspections. Buyer-disputed listings trigger investigation and potential badge revocation.
What if the unit fails commissioning at my site? +
3rd Party Verified is a snapshot inspection at the time of listing. It documents condition then, not a continuing warranty. Refound facilitates dispute mediation between buyer and seller; refer to TOS for full terms. We strongly recommend on-site inspection upgrade for any unit you intend to re-energize without rebuild.
Are PCB-contaminated transformers allowed on Refound? +
Units with > 50 ppm PCB content must be marked and listed accordingly per 40 CFR 761. Units > 500 ppm without proper marking are disqualifying findings and cannot earn the 3rd Party Verified badge.
How does freight work for a 200-ton transformer? +
Listings include physical location ZIP, weight, and dimensions. Refound integrates inline freight quotes for standard heavy-haul. For >50-ton items, we coordinate with regional rigging contractors. Quote within 48 hours of inquiry.
Can I get a unit with a brand-new manufacturer warranty? +
Most secondary-market units ship as-is or with seller-provided refurb warranty (typically 12-24 months). Some OEM excess inventory units (never installed) carry full original OEM warranty. These are tagged "Factory New" in search.
Stop waiting on the OEM queue.
Refound has the inventory in stock. Browse current listings or set a saved search and we'll alert you the moment a matching unit hits the platform.