Delta Star
US maker of power transformers, mobile substations and unitized substations up to 345 kV, built in Lynchburg, Virginia, San Carlos, California and Quebec. A MacLean Power Systems company with a data center line.
Facts
Source per value- Segment Power when the maker publishes power, GSU, HVDC, autotransformer or reactor products or a rating above 20 MVA; Distribution when it publishes distribution, pad-mount, pole-mount, network or dry-type products; both when it publishes each. Derived from Transformer types and Largest rating.
- Power 2
- Transformer types Product types the maker lists, separated by semicolons: power, GSU, autotransformer, HVDC, shunt reactor, substation, distribution, pad-mount, pole-mount, network, dry-type (cast resin, VPI), mobile, rectifier/industrial, renewable and data center lines.
- power; substation; mobile; data center 3
- Largest rating MVA Largest verified published rating in the cited product or regional scope, in MVA. Product range identifies base, forced-cooling, phase-shifter throughput or group-history claims; these rating bases are not interchangeable. Planned future ranges are described separately.
- 200 2
- Smallest rating kVA Smallest published rating, in kVA. Shows how far down the distribution range a maker goes.
- Not published
- Product range The kVA/MVA range as the maker states it, by product line.
- Power transformers to 200 MVA without LTC (170 MVA with LTC); mobile transformers to 133 MVA; unitized substations 2-100 MVA 2
- Highest voltage kV Highest voltage class the maker publishes or has delivered, in kV (AC system voltage; HVDC noted under Voltage classes).
- 345 2
- Voltage classes Voltage classes and BIL as the source states them, by product or plant.
- high side 15-345 kV; Delta Star North to 315 kV class 1
- Plants Transformer manufacturing locations, city and country. Planned plants carry their target date. Location lists identify verified sites and may not cover every factory in a global group.
- Lynchburg, Virginia, United States; San Carlos, California, United States; Saint-Jean-sur-Richelieu, Quebec, Canada 1
- Plant countries Countries with verified operating transformer manufacturing in the cited scope; not necessarily the complete global footprint. Component and service-only sites do not establish new-unit manufacturing.
- United States; Canada 1
- US plant Yes when an operating US transformer plant is verified; No when the source shows the maker's plants and none is in the US. Empty means not verified.
- Yes 1
- EU plant Yes when an operating transformer plant in an EU-27 country is verified (the UK, Norway, Switzerland and Turkey do not count). Empty means not verified.
- Not published
- Capacity expansion Announced transformer capacity expansions: amount in the original currency, place, announcement date, target date and output change. US and EU projects first.
- Delta Iron Works, an 80,000 sq ft tank fabrication shop on the Lynchburg, Virginia campus, opened 2025 1
- Largest US/EU expansion $M Largest single announced US or EU transformer capacity investment, in US$ millions, where the source states a dollar amount. Euro amounts stay in Capacity expansion unconverted.
- Not published
- Expansion region Where the announced capacity expansions are: US, EU, both, or only elsewhere (Other).
- US 1
- Certifications and standards Quality certifications, listings and design standards the source names (ISO 9001, IEEE C57, IEC 60076, EU Ecodesign Tier 2, utility approvals).
- Not published
- Data center offer Yes when the maker markets transformers for data centers or has disclosed a data center transformer order. Empty means not found.
- Yes 4
- Data center product or order The named data center line, or the disclosed order with value and date.
- Power transformers, unitized substations and mobile substations for data centers 4
- Parent or owner Parent company or owner where the source states one.
- MacLean Power Systems 1
- HQ country Country of the maker's headquarters.
- United States 1
- HQ region Region of the maker's headquarters.
- North America 1
- Legacy brands and names Sourced former names and acquired transformer businesses, retained on the current maker row to avoid duplicate supplier counts.
- Not published
Sources
- Delta Star: Manufacturing facilities accessed 2026-11-11
- Delta Star: Unitized substations spec sheet accessed 2026-11-11
- Delta Star: Mobile transformers accessed 2026-11-11
- Delta Star: Data centers accessed 2026-11-11
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