Equipment & procurement

Start with the design basis, then test each equipment path against it.

Review equipment against the project.

Vela reads the project's requirements first, then checks orders, supplier records and public listings against that basis. Missing information stays missing. A candidate stays listed for engineer review until the team confirms what it needs to.

Find transformer paths for phase one.

For TX-01, Vela reads NAC-EQ-118 Rev 05, NAC-E-105 Rev 06 and PO-24017, then the public listings from CTG Power Systems, Sunbelt Solomon and Maddox. Samir Shah reviews the comparison.

Which listed transformers could work for the 40 MW phase, and what would we need to confirm?

Northstar 300 MW AI CampusShared project

Overview

Procurement · First 40 MW energized 6 Nov 2026

Phase: Procurement
Capacity: 40 MW of 300 MW
Utility: Oncor
ISO: ERCOT
Energization: 6 Nov 2026

Needs your attention

Ranked by what is holding the schedule, newest evidence first.

1 blocking

TX-01 supplier basis is one revision behindDue in 2d
Meridian Transformer Works is still working to NAC-E-105 Rev 05; Rev 06 changed the tap range and vector-group note.
SG-01 rating needs engineer reviewDue in 5d
ONC-FS-104 Rev 04 states a 40 kA switchgear minimum; SG-01 is recorded at 31.5 kA.
NAC-ENG-1040 is on the energization pathDue in 8d
The revised Oncor study still has to be reconciled with the electrical design before commissioning work closes.

Project trajectory

The gate sequence, and what the schedule has actually done.

01TX-01 on siteNAC-PROC-22106 Nov 2026+24d vs target
02Install TX-01 and SG-01NAC-CON-3320Dec 2026
03First 40 MW energizedNAC-MIL-5000Q1 2027

Which listed transformers could work for the 40 MW phase, and what would we need to confirm?

Worked for 16s

Searched project memory for TX-01search1.7sNAC-EQ-118 · Rev 05PO-24017NAC-PROC-2210Sources3 cited, 11 consulted
Opened ctgpowersystems.com2.0s
ctgpowersystems.com/inventory/tte-138-345-138-kv-power-transformer-69-92-115-mva
Read impedance on CTG Power Systemsread1.5s
Spawned 2 subagents in parallel2.2sSunbelt SolomonUnit ratings: Not on the pageMaddoxUnit listing: Quote only
Compared published values to TX-01read1.7s
Closed Maddox0.9s

I'll compare the TX-01 design basis with the published transformer pages, and keep any missing value open for engineer review.

CTG lists a TTE 138/34.5/13.8 kV, 69/92/115 MVA unit. Voltage is close to the TX-01 basis, but impedance is not on the page. Sunbelt Solomon and Maddox do not publish enough unit data for the same comparison.

Exact action needs approvalPaused

Samir Shah reviews whether the CTG listing stays under engineering review for the 40 MW phase

Review item: CTG listed TTE unit against the TX-01 basis
Open check: Impedance, vector group, tap arrangement
Source basis: NAC-EQ-118 Rev 05, NAC-E-105 Rev 06
Also notified: Elena Torres, to request supplier data if it stays under review

RejectApprove exact action

Ask anything…

Vela may make mistakes. Verify all outputs.

Equipment has to match the project.

Vela already holds what the project decided about TX-01: the datasheet, the one-line, the protection study, the date it is needed. Its agents open reseller sites in cloud browsers and read each listing against that.

1Vela opens TX-01 and recalls what the project decided about it.
2Cloud agents open reseller sites and read every listing.
3A listed rating is checked against the load in the basis.
4A unit with no on-load tap changer is set aside.
5A different impedance reaches the protection study, so Vela flags it.
6What it read, where, and what to ask stays on TX-01.

TX-01 · 138/34.5 kV, 75/100 MVA

Voltage and terminalsTTE, 69/92/115 MVA, new: 138 / 34.5 kV with a 13.8 kV tertiaryBasis 138 / 34.5 kV, NAC-EQ-118 Rev 05Tertiary is not in the design. Engineer reviewAsked the seller whether the tertiary can stay unloaded
A second resellerSunbelt Solomon, ready to ship: substations listed as a category, no unit ratings on the pageBasis 138/34.5 kV, 75/100 MVA, NAC-EQ-118 Rev 05Nothing on the page to compareQuote request drafted for a person to review
Rating and coolingTTE, 69/92/115 MVA, new: ONAN / ONAF1 / ONAF2Basis 75 MVA ONAN, 100 MVA ONAF, NAC-EQ-118 Rev 05Base stage is 6 MVA under. Engineer reviewKept for review, with the load case attached
Ratio and tapsWaukesha, 30 to 56 MVA, built 2003: five de-energized taps, 131.1 to 144.9 kVBasis on-load taps ±10%, NAC-E-105 Rev 06No on-load tap changer. Outside basisSet aside, and the reason kept on TX-01
ImpedanceWaukesha, 30 to 56 MVA, built 2003: 9.69%Basis 9.25%, NAC-E-214 Rev 030.44 points higher. Protection study flaggedOpened a question on NAC-E-214 for the engineer
Vector groupTTE, 69/92/115 MVA, new: YNyn0+dBasis Dyn1, NAC-E-105 Rev 06Differs from the basis. Engineer reviewOpened a question on NAC-E-105 for the engineer

Design basisNAC-EQ-118 · Rev 05
Public listings read2 kept for review, 1 set asideCTG Power Systems, public inventory, 20 Sep 2026
Questions for the sellerNameplate, test report, outlineDrafted for review
TX-01 on site, 6 Nov 2026NAC-PROC-2210

CTG Power SystemsSunbelt SolomonCloud browser

about:blankctgpowersystems.com/inventory/substation-transformerssunbeltsolomon.com/ready-to-shipctgpowersystems.com/inventory/substation-transformersctgpowersystems.com/inventory/substation-transformersctgpowersystems.com/inventory/substation-transformersctgpowersystems.com/inventory/substation-transformers

Cloud browser started
Loaded the basis for TX-01 from the project
Public pages only, nothing signed in
Opening reseller inventory

TTE 138/34.5/13.8 kV, 69/92/115 MVA

Voltage: 138 / 34.5 / 13.8 kV
Rating: 69 / 92 / 115 MVA
Condition: New

Basis 138 / 34.5 kV, NAC-EQ-118 Rev 05

Tertiary is not in the design. Engineer review

Asked the seller whether the tertiary can stay unloaded

Ready to ship: substations

Inventory: Listed as a category
Unit ratings: Not on the page
To ask: Quote form

Basis 138/34.5 kV, 75/100 MVA, NAC-EQ-118 Rev 05

Nothing on the page to compare

Quote request drafted for a person to review

TTE 138/34.5/13.8 kV, 69/92/115 MVA

Rating: 69 / 92 / 115 MVA
Cooling: ONAN / ONAF1 / ONAF2
Condition: New

Basis 75 MVA ONAN, 100 MVA ONAF, NAC-EQ-118 Rev 05

Base stage is 6 MVA under. Engineer review

Kept for review, with the load case attached

Waukesha 138GrdY/34.5GrdY, 30 to 56 MVA

Built: 2003
Taps: Five de-energized, 131.1 to 144.9 kV
BIL: 650 / 200 kV

Basis on-load taps ±10%, NAC-E-105 Rev 06

No on-load tap changer. Outside basis

Set aside, and the reason kept on TX-01

Waukesha 138GrdY/34.5GrdY, 30 to 56 MVA

Built: 2003
BIL: 650 / 200 kV
Impedance: 9.69%

Basis 9.25%, NAC-E-214 Rev 03

0.44 points higher. Protection study flagged

Opened a question on NAC-E-214 for the engineer

TTE 138/34.5/13.8 kV, 69/92/115 MVA

Voltage: 138 / 34.5 / 13.8 kV
Rating: 69 / 92 / 115 MVA
Vector group: YNyn0+d

Basis Dyn1, NAC-E-105 Rev 06

Differs from the basis. Engineer review

Opened a question on NAC-E-105 for the engineer

Illustrative TX-01 model and design basis. Geometry is representative, not a manufacturer's arrangement. Candidate values are from CTG Power Systems, public inventory, and the Sunbelt Solomon ready-to-ship page, both public and read 20 Sep 2026. Vela has no affiliation with either. A listing is not confirmed availability.