RIGI-backed $550M gas pipeline project approved for TGS (NYSE: TGS)

Rhea-AI Filing Summary

Transportadora de Gas del Sur S.A. (tgs) reports that Argentina’s Ministry of Economy has approved its participation in the Incentive Regime for Large Investments (RIGI) for a major gas infrastructure project. The approved Single Project, called “Expansion of Section I of the Perito Francisco Pascasio Moreno Gas Pipeline,” will add incremental capacity of fourteen million cubic meters per day to this pipeline. The project covers construction, financing, operation and maintenance of the required infrastructure and involves a total planned investment of USD 550,000,000.

Positive

• RIGI-backed approval of major growth project: The Ministry of Economy approved TGS’s RIGI Single Project to expand the Perito Francisco Pascasio Moreno Gas Pipeline by 14 MMm³/d, supported by a planned investment of USD 550,000,000.

Negative

• None.

Insights

Latin America infrastructure & utilities analyst

RIGI approval clears a $550M, high-capacity gas pipeline expansion for TGS.

The Argentine Ministry of Economy approved Transportadora de Gas del Sur’s adherence to the Incentive Regime for Large Investments (RIGI) for a Single Project expanding Section I of the Perito Francisco Pascasio Moreno Gas Pipeline. The plan targets an additional fourteen million cubic meters per day of gas transport capacity.

The filing states a total investment of USD 550,000,000 for construction, financing, operation and maintenance of the required infrastructure. Being framed under RIGI suggests a structured regime for large-scale capital deployment, though the text does not detail specific tax or regulatory benefits.

The approval was granted by Resolution no. 676/2026 on May 12, 2026 and published in the Official Gazette. Future disclosures in company filings may provide timelines, funding structure and how this expansion influences volumes and profitability once the new capacity becomes operational.

Key Figures

Total project investment: USD 550,000,000 Incremental gas capacity: 14 MMm³/d Approval resolution number: Resolution no. 676/2026 +1 more

4 metrics

Total project investment USD 550,000,000 Planned cost for RIGI Single Project expansion

Incremental gas capacity 14 MMm³/d Additional capacity for Perito Francisco Pascasio Moreno Gas Pipeline

Approval resolution number Resolution no. 676/2026 Ministry of Economy approval of RIGI project on May 12, 2026

Form type Form 6-K Report of Foreign Issuer under Exchange Act

Key Terms

Incentive Regime for Large Investments (RIGI), Single Project, operation and maintenance (O&M), Official Gazette

4 terms

Incentive Regime for Large Investments (RIGI) financial

"approved the request to adhere to the Incentive Regime for Large Investments (RIGI) submitted by Transportadora"

Single Project financial

"as holder of the Single Project denominated “Expansion of Section I of the Perito Francisco Pascasio Moreno Gas Pipeline”"

operation and maintenance (O&M) technical

"construction, financing, operation and maintenance (O&M) of the infrastructure required to generate an incremental capacity"

Operation and maintenance (O&M) are the everyday activities needed to keep an asset—such as a factory, power plant, infrastructure project, or equipment—running safely and efficiently, including routine servicing, repairs, staffing, spare parts and monitoring. For investors, O&M matters because those ongoing costs and the quality of upkeep determine how reliably an asset produces revenue, how long it lasts, and how predictable cash flow and future capital needs will be—think of it like the difference between a well‑kept car and one that breaks down frequently.

Official Gazette regulatory

"Resolution no. 676/2026 issued by the Ministry of Economy -published in the Official Gazette on this date-"

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FAQ

What did Transportadora de Gas del Sur (TGS) announce in this Form 6-K?

TGS announced that Argentina’s Ministry of Economy approved its request to adhere to the Incentive Regime for Large Investments (RIGI) for a major gas pipeline expansion project, formalized through Resolution no. 676/2026 and published in the Official Gazette.

What is the RIGI project approved for TGS?

The approved RIGI project is a Single Project named “Expansion of Section I of the Perito Francisco Pascasio Moreno Gas Pipeline.” It is structured under Argentina’s Incentive Regime for Large Investments and is held by Transportadora de Gas del Sur S.A. Sucursal Dedicada 1, established specifically for RIGI.

How much will TGS invest in the approved gas pipeline expansion?

The filing states that the Single Project requires a total investment of USD 550,000,000. This amount covers construction, financing, operation and maintenance of the infrastructure needed to expand Section I of the Perito Francisco Pascasio Moreno Gas Pipeline under the RIGI framework.

How much additional gas capacity will the TGS project create?

The project aims to generate an incremental capacity of fourteen million cubic meters per day (14 MMm³/d). This increase applies to the Perito Francisco Pascasio Moreno Gas Pipeline, implying a significant expansion of transport capability once the new infrastructure is built and operating.

When was TGS’s RIGI project approved by the Ministry of Economy?

According to the disclosure, the Ministry of Economy approved the RIGI project on May 12, 2026, through Resolution no. 676/2026. The resolution was published in Argentina’s Official Gazette on the same date referenced in the company’s communication.

Who is the project holder for TGS under the RIGI regime?

The project holder is Transportadora de Gas del Sur S.A. Sucursal Dedicada 1, which TGS established pursuant to the RIGI framework. This branch entity is designated as holder of the Single Project for expanding Section I of the Perito Francisco Pascasio Moreno Gas Pipeline.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

_____________

FORM 6-K

Report of Foreign Issuer

Pursuant to Rule 13a-16 or 15d-16 of

the Securities and Exchange Act of 1934

For May 13, 2026

Commission file number: 1-13.396

Transportadora de Gas del Sur S.A.

Cecilia Grierson 355, Twenty sixth Floor

(1107), Capital Federal

Argentina

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F  X  Form 40-F

Indicate by check mark if registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): __

Indicate by check mark if registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): __

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to the Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes   No X

If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b):

City of Buenos Aires, May 13, 2026.

E-NOTA-20260513-62365

Messrs.

Comisión Nacional de Valores (Argentine Securities and Exchange Commission)

Bolsas y Mercados Argentinos S.A. (Argentine Stock Exchanges and Markets)

Bolsa de Comercio de Buenos Aires (Buenos Aires Stock Exchange)

Gerencia Técnica y de Valores Negociables (Technical and Negotiable Securities Management)

A3 Mercados S.A. (A3 Markets)

Re: Material Fact. Approval of RIGI project (Incentive Regime for Large Investments) submitted by tgs.

Dear Sirs,

I am writing to you in my capacity as Head of Market Relations of Transportadora de Gas del Sur S.A. (“tgs” or the “Company”), pursuant to the provisions of Comisión Nacional de Valores (Argentine Securities and Exchange Commission) and the regulations of Bolsa de Comercio de Buenos Aires (Buenos Aires Stock Exchange) and A3 Mercados S.A. (A3 Markets).

We hereby inform you that on May 12, 2026, by means of Resolution no. 676/2026 issued by the Ministry of Economy -published in the Official Gazette on this date- said Ministry approved the request to adhere to the Incentive Regime for Large Investments (RIGI) submitted by Transportadora de Gas del Sur S.A. Sucursal Dedicada 1 -established by tgs pursuant to RIGI- as holder of the Single Project denominated “Expansion of Section I of the Perito Francisco Pascasio Moreno Gas Pipeline”. The purpose of the Single Project is the construction, financing, operation and maintenance (O&M) of the infrastructure required to generate an incremental capacity of fourteen million cubic meters per day (14 MMm³/d) to the Perito Francisco Pascasio Moreno Gas Pipeline, which will require a total investment of USD 550,000,000 (US dollars five hundred and fifty million).

Yours sincerely.

Hernán Diego Flores Gómez

    Head of Market Relations

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Transportadora de Gas del Sur S.A.

By:	/s/Alejandro M. Basso
Name:	Alejandro M. Basso
Title:	Chief Financial Officer and Services Vice President

By:	/s/Hernán D. Flores Gómez
Name:	Hernán Diego Flores Gómez
Title:	Legal Affairs Vice President

Date: May 13, 2026.