Catalog No. SY-LPT-500-500-230
EHV interconnect LPT - 500 MVA · 500/230 kV
Extra-high-voltage interconnect class stepping a 500 kV corridor to 230 kV. The longest clocks and heaviest hauls in the catalog family.
32-48 weeks ARO · Target, subject to confirmation.
- IEEE C57
- IEC
- BABA interest
- Interconnect ready
- ISO 9001
- UL
Compliance targets for the quotation. Exact standard parts are confirmed on the RFQ; badges are never presented as live factory certificates.
Core ratings
Nameplate band
500 MVA · 500 / 230 kV · 60 Hz
Listing lead time
32-48 weeks ARO. Target, subject to confirmation.
Market lead-time signal
WoodMac survey via ACP (Q2 2025): large/HV power TF avg ~128 weeks - survey/IR planning signal, not a Switchyard Supply quote; Nikkei (Mar 2026) quoting Hitachi Energy: waits >30 months - press/interview signal, not a Switchyard Supply quote
Working capital
Interest can be flagged on the quote form. Partner-reviewed, subject to underwriting.
Where an EHV class appears
A 500/230 kV unit interconnects two transmission voltages rather than feeding campus MV directly. Very large campuses and multi-site corridors see this class when the serving utility upgrades the surrounding grid as part of the interconnection agreement. The buyer of record is often the utility or a joint project entity, and the RFQ usually rides a broader interconnection scope.
Supply base is thinnest at EHV
US government reporting has flagged that import dependence rises with voltage class, and DOE's 2012 LPT study noted domestic reliance on imports is greatest for EHV units rated 345 kV and above. Fewer factories can wind, assemble, and test at 500 kV, and the test-bay schedule at those plants is itself a constraint. That is why EHV shapes carry the longest market clocks: DOE-linked hydropower addendum reporting has framed EHV units at up to about five years.
The haul plan decides feasibility
Tanks in this class sit near the top of the roughly 150 to 400 ton LPT shipping-weight range described in DOE's 2024 resilience report. Route feasibility, rail access, Schnabel car booking, and bridge ratings should be surveyed before the purchase order, because a unit that cannot reach the pad is not a procurement win. GAO's 2023 review noted transport for some moves runs to hundreds of thousands of dollars.
RFQ fields for this shape
Lock MVA per cooling stage, the 500/230 kV pair, autotransformer or two-winding construction per the study, BIL for both windings, %Z, OLTC and tap range, and the standards path. Name FAT witness rights and the shipping instrumentation in the contract. The catalog ARO band is a target confirmed on quotation and never a guaranteed OEM ship date.
Full catalog card · Lead-times guide · FAT guide · Financing