Sidersa Argentine Steel Project — long steel products
New long-steel plant — the first steel mill built in the country in over 50 years according to the official portal — with state-of-the-art technology, lower CO2 emissions and circular-economy-based production. Theoretical capacity: 360,000 t/yr (norm summary). Official portal: 3,800 jobs (direct and indirect).
How to supply it
what we have for a supplier, and how to request it
What we have on this project for a supplier
Who decides the purchase, who you invoice and where a new supplier registers.
Which lines each phase buys and when the window opens for each one.
Who they are, what each one does and how to sell to them.
All of this is surveyed and verified against its source. Crossed with what you sell —which of them your products suit, how to reach it and when— it is in your company report. Request the report
We cross what you manufacture or do against the 2 phases of this project and tell you which ones you fit into and when each one buys. Two pages, with the evidence behind them.
Where my company can get inThe project
what it is, the route, the owners, the works and the contractors
Who owns it
SIDERSA ACERIA S.D.E. (VPU, CUIT 33-71879284-9) verif Jul 22, 2025 ↗
The works, milestone by milestone
Overall construction progress is around 25%, with the structure of the plant buildings close to 70%, the civil works on foundations and footings at about 30% and some 650 people a day on site. Danieli's equipment starts arriving from Italy.
Sidersa presents its supplier strategy to some 60 industrialists from the region, at the Asociación Industrial Metalúrgica, and names for the first time the eight firms that bid the civil works and were already on site. Construction progress declared that day is 15%. In the same presentation it announces it will apply to the provincial strategic investment regime.
The ENRE authorises the transmission capacity access that Transener requested on Sidersa's behalf, to connect the new melting and rolling plant to the Sistema Argentino de Interconexión. It is approved once the objection window opened by Resolución ENRE 297/2025 expires unopposed.
Resolución 1028/2025 of the Ministerio de Economía is published in the Boletín Oficial, approving accession to the RIGI: USD 286,278,000 of total investment in eligible assets, 360,000 t/yr of theoretical capacity and thirty-six months of construction counted from June 2025. It is the first industrial project approved under the regime.
The RIGI accession date set by article 2 of Resolución 1028/2025: it is what starts the two-year clock of article 50 of the implementing decree, with a first deadline of 30 May 2027.
The Secretaría de Energía authorises Sidersa to build the 4.4 km underground 132 kV line to the Ramallo substation and grants it a fifteen-year concession. In the same act it establishes that, once the term is up, the installations pass into TRANSBA's concession.
The Secretaría de Energía authorises Sidersa S.A. to enter the wholesale electricity market as a Large Major User, for its site at Mendoza and Estanislao del Campo s/n, San Nicolás de los Arroyos. It is the first act tying the new plant to the grid: two years before the RIGI.
What it leaves in Buenos Aires
jobs, works, taxes, promises and the outlook
How many jobs it creates
700 workers on site in August 2026, with an expected peak of between 900 and 1,000, mostly local labour people on site (own staff plus contractors); this is the headcount at that moment and the declared peak, not an average over the 36 months prob Aug 1, 2026 ↗
around 300 direct employees and some 3,000 indirect jobs permanent jobs once the plant is running: 300 direct and 3,000 indirect, declared separately prob Aug 1, 2026 ↗
The works that stay behind
The infrastructure that stays standing once the works end, with its size and its source.
Underground high-voltage line between the plant and the Ramallo substation
Powerat 132 kV, underground
The province's transmission system: the act establishes that fifteen years after the resolution the installations pass into the concession of TRANSBA, the province of Buenos Aires trunk distribution carrier. The company builds, operates and maintains it at its own cost, and after that the line stops being its own.
Verbatim from article 1 of Resolución 12/2025: authorisation is granted «to build a private-use line of ONE HUNDRED AND THIRTY-TWO (132 kV), of the underground type, FOUR POINT FOUR KILOMETRES (4.4 km) long, from the future SIDERSA Substation (ET), to be installed near the town of San Nicolás… to the Ramallo substation, in the jurisdiction of… TRANSENER SOCIEDAD ANÓNIMA… at its exclusive cost and for its own needs». Article 2: the concession runs fifteen years from the act, i.e. to 20 January 2040. Article 3, verbatim: «Once the term set in Article 2 of this act has elapsed, the installations covered by this resolution shall be operated, under the regulatory and tariff regime in force, under the concession of COMPAÑÍA DE TRANSPORTE DE ENERGÍA ELÉCTRICA POR DISTRIBUCIÓN TRONCAL DE LA PROVINCIA DE BUENOS AIRES (TRANSBA S.A.)».
Sidersa's new substation, on the outskirts of San Nicolás
PowerThe same fate as the line: after fifteen years it passes into TRANSBA's concession. In the meantime it is the substation connecting the plant to the national grid.
Verbatim from the recitals of Resolución 12/2025: «the SIDERSA S.A. Substation to be built will use GIS 132 kV technology and will be equipped with two power transformers, TR1 132/13.2 kV 50/65 MVA and TR2 132/13.2 kV 25/30 MVA».
New line bay at Transener's Ramallo substation
PowerTransener: the bay is built inside a high-voltage transmission substation that does not belong to Sidersa, to the carrier's specifications. It stays there from day one.
Verbatim from the recitals of Resolución 12/2025: «a new line bay will be built at the Ramallo substation at 132 kV, which will include all the switching, protection, control, metering and communications equipment required in line with TRANSENER S.A.'s specifications». Access to transmission capacity was authorised by the ENRE on 26 August 2025, at Transener's request and on Sidersa's application, to connect the plant to the Sistema Argentino de Interconexión.
The steel mill and the long-products rolling mill
Productivetonnes a year of theoretical capacity in plain and ribbed bar and wire rod, on four plots valued at USD 2,313,752
San Nicolás and the country's metalworking chain: it is installed long-steel capacity that today is partly covered by imports and, according to the official portal, the first steel mill built in Argentina in more than fifty years. When construction ends, what stays is a working plant, with its permanent demand for refractories, maintenance, gases, scrap and logistics.
Theoretical capacity of 360,000 t/yr «from the fourth year after start-up», and the four plots at USD 2,313,752, counted within the 15% cap of article 174. Feedstock: 99.5% scrap.
- What it already pays in taxes and royalties — We have not broken down this project’s local fiscal contribution: the primary source that sets each item still has to be opened, and an act of the State is not published on press backing.
- Who promised what — We have not surveyed the public promises about this project. A dated, verifiable commitment with its source closes them.
What could stall it
risks and how to track them
- What could stall it — We have not documented this project’s risks. An identifiable vector with its source closes them.
- How to tell whether it is advancing — We have not defined this project’s indicators: what observable fact marks its progress still has to be identified.
How we verified this
the act, the gaps and the sources
The RIGI act, in detail
EX-2024-136346034- -APN-SCEYM#MEC verif Jul 22, 2025 ↗
May 30, 2025 verif Jul 22, 2025 ↗
The act’s articles, in detail
1 facts on the commitment
SIDERSA ACERÍA S.D.E., tax ID 33-71879284-9. verif Jul 22, 2025 ↗
What we could not confirm
There are 4 in this project. Each says why it could not be confirmed and what it would take to close it.
H-01How many of today’s 700 workers are from San Nicolás and its area+
The company states the works are «mostly local labour» but does not publish the percentage, and the act does not require it: the commitment in Resolución 1028/2025 is about suppliers, not payroll.
H-02Which work front each of the eight contractors takes, and for how much+
The only source that names them is the presentation the company gave to the region's industrialists: it gives the list and the fact that they bid the civil works, and nothing more. There is no act, contract or tender document published, and the works are private, so there is no Boletín Oficial to open. The same article says «seven firms» and lists eight.
H-03Whether Sidersa was admitted into the Buenos Aires provincial strategic investment regime+
It is what decides whether the 50% floor on purchases from Buenos Aires province suppliers applies instead of the 20% national one. In March 2026 the company said it would apply; the act admitting it does not appear on the province's official legal database. We searched for it twice, separately, and neither search found it.
H-04How many firms are registered in the Registro de Desarrollo de Proveedores Bonaerenses+
The roll is not public: the register's page explains how to sign up and what paperwork it asks for, but publishes neither the list nor the number of registrants. Without that number you cannot measure the gap between what the 50% floor will demand and what registered supply can cover, which is exactly the question that matters to an SME.
We look at what your company does and tell you whether we see a sign that it fits this market, with the evidence behind it. If we do not see one, we say so too and name the condition that would change it. One page as a dated PDF, within 48 working hours.
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