UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS

AS OF JUNE 30, 2025

AND FOR THE SIX AND THREE-MONTH PERIODS THEN ENDED

PRESENTED ON COMPARATIVE BASIS

(In millions of U.S. dollar (“US$”))

GLOSSARY OF TERMS

The following are not technical definitions, but they are helpful for the reader’s understanding of some terms used in the notes to the Unaudited Consolidated Condensed Interim Financial Statements of the Company.

GLOSSARY OF TERMS: (Continuation)

GLOSSARY OF TERMS: (Continuation)

UNAUDITED CONSOLIDATED CONDENSED INTERIM STATEMENT OF

COMPREHENSIVE INCOME

For the six and three-month periods ended June 30, 2025, presented on comparative basis.

(In millions of US$ – unless otherwise stated)

UNAUDITED CONSOLIDATED CONDENSED INTERIM

STATEMENT OF COMPREHENSIVE INCOME (Continuation)

For the six and three-month periods ended June 30, 2025, presented on comparative basis.

(In millions of US$ – unless otherwise stated)

The accompanying notes are an integral part of these Unaudited Consolidated Condensed Interim Financial Statements.

UNAUDITED CONSOLIDATED CONDENSED INTERIM STATEMENT

OF FINANCIAL POSITION

As of June 30, 2025, presented on comparative basis.

(In millions of US$ – unless otherwise stated)

UNAUDITED CONSOLIDATED CONDENSED INTERIM STATEMENT

OF FINANCIAL POSITION (Continuation)

As of June 30, 2025, presented on comparative basis.

(In millions of US$ – unless otherwise stated)

The accompanying notes are an integral part of these Unaudited Consolidated Condensed Interim Financial Statements.

UNAUDITED CONSOLIDATED CONDENSED INTERIM STATEMENT OF CHANGES IN EQUITY

For the six-month period ended June 30, 2025, presented on comparative basis.

(In millions of US$ – unless otherwise stated)

The accompanying notes are an integral part of these Unaudited Consolidated Condensed Interim Financial Statements.

UNAUDITED CONSOLIDATED CONDENSED INTERIM STATEMENT OF CASH FLOWS

For the six-month period ended June 30, 2025, presented on comparative basis.

(In millions of US$ – unless otherwise stated)

The accompanying notes are an integral part of these Unaudited Consolidated Condensed Interim Financial Statements.

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 1: GENERAL INFORMATION

1.1 General information of the Company

The Company’s principal executive office is located in Maipú 1, Autonomous City of Buenos Aires in Argentina, which participates in the energy sector, mainly in the production of oil and gas and power generation.

In the oil and gas segment, the Company develops an important activity in gas and oil exploration and production, reaching a production level in the six-month period ended June 30, 2025 of 12.4 million m3/day of natural gas and 5.4 thousand bbl/day of oil in 11 productive areas and 2 exploratory areas in Argentina. Its main production blocks are located in the Provinces of Neuquén and Río Negro.

In the generation segment, the Company, directly and through its subsidiaries and joint ventures, has a 5,472 MW installed capacity as of June 30, 2025, which represents approximately 13% of Argentina’s installed capacity, and being one of the largest independent generators in the country.

In the petrochemicals segment, the Company operates 2 high-complexity plants in Argentina producing styrene, synthetic rubber and polystyrene, with a share ranging between 89% and 98%, in the domestic market.

Finally, through the holding, transportation and others segment, the Company participates in the electricity transmission and gas transportation businesses. In the transmission business, the Company jointly controls Citelec, which has a controlling interest in Transener, a company engaged in the operation and maintenance of a 22,349 km high-voltage electricity transmission network in Argentina with an 86% share in the Argentine electricity transmission market. In the gas transportation business, the Company jointly controls CIESA, which has a controlling interest in TGS, a company holding a concession for the transportation of natural gas with 9,248 km of gas pipelines in the center, west and south of Argentina, and which is also engaged in the processing and sale of natural gas liquids through the Cerri Complex, located in Bahía Blanca, in the Province of Buenos Aires, in addition to shale gas transportation and conditioning at Vaca Muerta. Additionally, the segment includes advisory services provided to related companies.

1.2 Economic context in which the Company operates

The Company operates in a complex economic context which main variables are experiencing volatility as a result of political and economic events both domestically and internationally.

As part of the economic stabilization plan, on April 11, 2025 the Government announced measures to ease the exchange rate regime and strengthen the monetary system. These measures were promoted to achieve the priority objective of reducing inflation, boosting economic activity, increasing monetary predictability and building up freely available reserves to support the Government’s economic program. This program is financially backed by a new US$ 20 billion funding facility agreed with the International Monetary Fund, among other agreements. Together, these agreements could potentially contribute to a US$ 23.1 billion increase in BCRA’s net reserves during 2025. As a result, inflation has slowed, with monthly figures below 2% in May and June 2025, and the local primary fiscal surplus has been maintained.

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 1: (Continuation)

The context of volatility and uncertainty continues as of the date of issuance of these Consolidated Condensed Interim Financial Statements, and it is not possible to predict the macroeconomic and financial situation’s evolution in Argentina or internationally, or any new measures to be announced.

The Company’s Management permanently monitors the evolution of the variables affecting its business to define its course of action and identify potential impacts on its assets and financial position.

The Company’s Consolidated Condensed Interim Financial Statements should be read in light of these circumstances.

NOTE 2: REGULATORY FRAMEWORK 

2.1 Oil and Gas

2.1.1 Gas market

2.1.1.1 Natural Gas for the residential segment and CNG

SE Resolutions No. 602/24, No. 25/25, No. 111/25, No. 139/25, No. 176/25, No. 228/25 and No. 288/25 established the PIST price to be passed on to end users pursuant to the agreements entered into under GasAr Plan for gas consumptions as from the months of January through July 2025, respectively, and on the tariff schemes published by ENARGAS’ effective date.

2.1.1.2 Compensation for subsidized natural gas consumption

ENARGAS Resolution No. 125/25 restructures the compensation system for natural gas consumption subsidies to natural gas distribution companies, modifying the entity receiving such compensation. The new mechanism, effective as from February 1, 2025, establishes that compensation will be collected directly by natural gas producers and deducted from the invoices issued by producers to distributors.

As of the date of issuance of these Consolidated Condensed Interim Financial Statements, the enactment of clarifying regulations is still pending.

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

 
NOTE 2: (Continuation)

2.1.1.3 LNG exports

SE Resolution No. 145/25 approved the LNG export procedure, establishing that, under Law No. 27,742, a firm LNG export authorization will be granted to allow holders the right to export the authorized volumes without interruptions, restrictions or redirections over the term of the authorization.

2.2 Generation

In line with the objective of ensuring free contracting in the MAT established by Law No. 27,742, on January 28, 2025, SE Resolution No. 21/25 was published establishing different modifications regulating dispatch and operation at the WEM’s MAT. The main modifications include:

- Generators, self-generators and co-generators of conventional thermal, hydraulic and nuclear sources commissioned as from January 1, 2025 are exempted from the suspension of contracting within the MAT;

- The presentation or renewal of Energy Plus contracts is limited until October 31, 2025, after the expiration of such contracts the Energy Plus market will no longer be in effect;

- The dispatch scheme set by SE Resolution No. 354/20 is abrogated, effective as from February 1, 2025, and no alternative dispatch scheme is established contemplating the obligations under ENARSA’s supply contract with Bolivia and contracts within the GasAr Plan’s framework;

- As from March 1, 2025, the recognition of fuel costs is authorized according to reference prices and the values declared and accepted in the Production Cost Statement plus freight, natural gas transportation and distribution costs, and taxes and fees.

- CAMMESA will continue centralizing fuel supply for contracts entered into under specific schemes (SE Resolutions No. 220/07, No. 21/16 and No. 287/17);

- generators remunerated under the spot scheme will be able to manage their own fuel, with CAMMESA remaining as the supplier of last resort; and

- new values are established for the cost of non-supplied energy, effective as from February 1, 2025, under the following tiers: (i) US$ 350 /MWh up to 5%; (ii) US$ 750 /MWh up to 10%, and (iii) US$ 1,500 /MWh for more than 10%.

CAMMESA published the proposal with guidelines contemplating various changes to the WEM structure and remuneration schemes for generation, submitted by the SE pursuant to Note NO-2025-09628437-APN-SE#MEC, and received comments from the Associations representing WEM agents. The reports requested by the SE are pending issuance and will be considered for the passing of transitional WEM adjustment regulations.

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 2: (Continuation)

On its part, SE Note NO-2025-35216647-APN-SE#MEC dated April 4, 2025 establishes guidelines for the gas dispatch priority scheme for thermal generation in the WEM. Tenders by generators opting into managing their own fuel supply will be considered firm and, in case of non-compliance, will be subject to a Deliver or Pay penalty equivalent to 70% of the unavailable volume’s reference price.

The new reference price equals 90% of the weighted average price per natural gas basin in the PIST using Round 4.2 prices for the Neuquina Basin and the Norte Basin and Round 4.1 prices for the Austral Basin.

Reference prices for liquid fuels are set for each generator based on international indicators, including a premium covering associated financial and logistical costs, and prices for liquid fuels and natural gas from neighboring countries are recognized at the exchange rate effective on the last business day before the transaction due date, associated with the consumption recognized in the respective economic transaction.

Based on the above-mentioned modifications, CAMMESA made several calls to generating agents for natural gas supply tenders for generation at higher prices.

On May 30, 2025, through Executive Order No. 370/25, the National Government extended the national emergency for the electricity generation, transmission, and distribution segments, and for the natural gas transportation and distribution segments, until July 9, 2026.

On July 7, 2025, through Executive Orders No. 450/25 and No. 452/25, Laws No. 15,336 and No. 24,065 were amended, and the ENRGE was established to replace and unify the ENARGAS and the ENRE, respectively, under the guidelines established in the Bases Law (Law No. 27,742).

Executive Order No. 450/25 establishes a 24-month transition period during which the SE must issue regulations aiming to, among other things:

The following amendments to Laws No. 15,336 and No. 24,065 are noteworthy:

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

 
NOTE 2: (Continuation)

In addition, the SE is empowered to authorize the execution of expansions to the transmission system within an existing concession, after consulting with CAMMESA, and may finance it with FNEE resources. Alternatively, the grid may be expanded on the initiative and at the risk of the party carrying out the expansion, which will be granted priority for the use of the transmission capacity, assignable to third parties.

2.2.2 BESS (Battery Energy Storage Systems) call for tenders

In February 2025, SE Resolution No. 67/2025 launched a national and international call for tenders for up-to-500 MW energy storage projects in the AMBA aiming to improve the electricity grid’s reliability.

The contracts to be executed between distributors and generators will have a maximum 15-year term and provide for a remuneration for power capacity (up to US$ 15,000/MW-month) and energy supplied (US$ 10/MWh), with CAMMESA acting as guarantor of last resort. The commissioning’s target date is scheduled for January 2027.

On July 15, 2025, 27 tenders were submitted for a total 1,347 MW power capacity. Pampa presented a 50-MW project. The award is scheduled for August 29, 2025.

2.2.3 Remuneration at the spot market

SE Resolutions No. 603/24, No. 27/25, No. 113/25, No. 143/25, No. 177/25, No. 227/25, No. 280/25 and No. 331/25, updated the remuneration values for spot generation, providing for 4%, 4%, 1.5%, 1.5%, 2%, 1.5%, 1% and 0.4% increases from the January-August 2025’s economic transactions, respectively. Likewise, the maximum spot price in the WEM was updated to $ 13,487/MWh as from April 2025.

2.3 Gas Transportation

TGS’s Tariff situation

TGS received monthly tariff updates for the January-March 2025 period; to this effect, ENARGAS published transitional tariff charts with 2.5%, 1.5% and 1.7% increases, respectively.

On April 30, 2025, ENARGAS Resolution No. 256/25 established the FTR conditions for the 2025-2030 period. This resolution establishes, among other things, the capital base as of December 31, 2024 and a real after-tax WACC discount rate of 7.18%, used to determine the initial tariff scheme, which includes a 3.67% weighted average tariff update to be implemented in thirty one equal and consecutive monthly installments beginning in May 2025. Likewise, the approval of the monthly tariff update methodology based on price indexes (CPI and IPIM) is postponed.

It also establishes the investment plan for a total of $279,108 million (at June 2024 currency), subject to ENARGAS’ control and the regulated operating expenses for the 2025-2030 five-year period.

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 2: (Continuation)

Later, through Executive Order No. 371/25, the SE was appointed as the enforcement authority for introducing contractual or tariff modifications. In this regard, SE Resolution No. 241/25 dated June 4, 2025 provided that the periodic transportation tariff update would be monthly, replacing the previous semi-annual scheme. On June 5, 2025, TGS expressed its consent to this resolution, and the tariff schemes were approved through ENARGAS Resolutions No. 350/25, No. 421/25 and No. 539/25, incorporating monthly 2.81%, 0.62% and 1.63% updates in addition to the application of the FTR increases.

License Extension

On July 24, 2025, Executive Order No. 495/25 was published, whereby the PEN extended the license granted to TGS for an additional 20-year period as from December 28, 2027, ratifying the “License Extension Memorandum of Understanding” entered into on July 11, 2025 between the MECON and TGS.

2.4 Transmission

Transener and Transba tariff situation

The ENRE determined the hourly remuneration values, establishing 4%, 4%, 2%, and 4% increases against effective values for the January-April 2025 period for Transener S.A. and Transba S.A.

On April 3, 2025, ENRE Resolution No. 236/25 amended the high-voltage and main electricity distribution utility concessionaires’ return rate defined by ENRE Resolution No. 28/25 dated January 10, 2025 from 6.10% to 6.48% after taxes.

On April 30, 2025, the tariff scheme resulting from the Five-Year Tariff Review process was approved and the ENRE established 42.89% and 10.30% increases against April 2025’s effective tariffs for Transener S.A. and Transba S.A., respectively. Similarly, the ENRE determined the remuneration for independent transmission companies, including Transener S.A., for the operation of the Choele Choel – Pto. Madryn Interconnection and the Fourth Line, and Transba S.A., for the operation of Transportista Independiente de Buenos Aires (TIBA)’s facilities, establishing a tariff equivalent to 77.92%, 100% and 99.73%, respectively, of Transener S.A.’s tariff.

In all cases, the increases apply as follows: 20% as from May 1, 2025, and the remaining 80% on a monthly basis over the June-December 2025 period. Likewise, a monthly tariff update mechanism based on the CPI and IPIM price indexes is provided for.

Consequently, the ENRE established the following increases:

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 2: (Continuation)

On June 17, 2025, Transener and Transba filed with ENRE motions of reconsideration against the resolutions issued on April 30, 2025 for Transener S.A., Transba S.A. and TIBA, requesting the ENRE to suspend the requirement to submit the investment plans for the May 2025-April 2030 period until the ENRE issues a ruling on said motions. In the case of the Choele Choel – Puerto Madryn Interconnection, as no motion was filed, the investment plan was submitted for the ENRE’s approval on June 30, 2025.

2.5 Regulations on access to the MLC

On April 11, 2025, the BCRA issued Communication “A” 8,226 easing several restrictions to access the MLC, including the following:

It is worth highlighting that the detailed information does not list all possibly applicable exchange regulations; for more information on Argentina’s exchange rate policies, please visit the Central Bank’s website: "www.bcra.gov.ar"

2.6 Tax regulations

Export Increase Program

On April 14, 2025, PEN Executive Order No. 269/25 repealed PEN Executive Order No. 28/23, reestablishing, as of that date, the payment and settlement in the MLC of 100% of export values.

NOTE 3: BASIS OF PREPARATION

These Consolidated Condensed Interim Financial Statements for the six-month period ended June 30, 2025 have been prepared pursuant to the provisions of IAS 34, “Interim Financial Information” as issued by the IASB, are expressed in millions of US dollars and were approved for their issuance by the Company’s Board of Directors on August 6, 2025.

The information included in the Consolidated Condensed Interim Financial Statements is recorded and presented in US dollars, which is the Company’s functional currency.

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 3: (Continuation)

This consolidated condensed interim financial information had been prepared under the historical cost convention, modified by the measurement of financial assets at fair value through profit or loss and they should be read together with the Consolidated Financial Statements as of December 31, 2024, which have been prepared under IFRS Accounting Standards as issued by the IASB.

These Consolidated Condensed Interim Financial Statements for the six-month period ended June 30, 2025 have not been audited. The Company’s management estimates they include all the necessary adjustments to state fairly the results of operations for the period. The results for the six-month period ended June 30, 2025, does not necessarily reflect in proportion the Company’s results for the complete year.

The accounting policies have been consistently applied to all entities within the Group.

Comparative information

The information as of December 31, 2024, disclosed for comparative purposes, arises from the Consolidated Financial Statements as of that date.

Additionally, certain non-significant reclassifications have been made to the Consolidated Financial Statements´ figures to keep the consistency in the presentation with the current period figures.

NOTE 4: ACCOUNTING POLICIES

The accounting policies applied in these Consolidated Condensed Interim Financial Statements are consistent with those used in the Consolidated Financial Statements for the last fiscal year, which ended on December 31, 2024.

4.1 New accounting standards, amendments and interpretations issued by the IASB effective as of December 31, 2025 and adopted by the Company

The Company has applied the following standards and / or amendments for the first time as of January 1, 2025:

The application of the detailed standards and amendments did not have any impact on the results of the operations or the financial position of the Company.

4.2 New accounting standards, amendments and interpretations issued by the IASB not yet effective and not early adopted by the Company

Pursuant to CNV General Resolution No. 972/23, early application of IFRS accounting standards and/or amendments thereto is not permitted unless specifically permitted at the time of adoption.

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 4: (Continuation)

As of June 30, 2025, the Company has not early applied the following standards and/or amendments:

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 5: GROUP STRUCTURE

Unless otherwise indicated, the country is also the principal place where the subsidiary carries out its activities.

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 5: (Continuation)

The following table presents the main activity and the financial information used for valuation and percentages of participation in associates and joint ventures; unless otherwise indicated, the share capital consists of millions of common shares with one vote per share:

⁽¹⁾ On April 24, 2025, SE Resolution No. 165/25 granted SESA the LNG Free Export Authorization certificate for 11.72 million m3/d of gas over a 30-year period between July 1, 2027 and June 30, 2057. Additionally, on May 5, 2025, MECON Resolution No. 559/25 approved SESA’s application to opt into the RIGI.

⁽²⁾ On March 21, 2025, MECON Resolution No. 302/25 approved VMOS’s application to opt into the RIGI.

⁽³⁾ The Company holds a 50% interest in CIESA, a company that holds a 53.83% interest in TGS’s capital stock; therefore, the Company has a 26.91% interest in TGS.

As of June 30, 2025, TGS’s common shares and ADR traded on the BCBA and NYSE were listed at $ 6,260.00 and US$ 25.90, respectively, giving Pampa’s holding an approximate market value of US$ 1,049 million ($ 1,268,253 million).

⁽⁴⁾ The Company has a 50% interest in Citelec, a company that holds a 52.65% interest in Transener’s capital stock; therefore, the Company has a 26.33% indirect interest in Transener. As of June 30, 2025, Transener’s common share price listed at the BCBA was $ 2,065.00, conferring Pampa’s indirect holding an approximate market value of US$ 225 million ($ 241,730 million).

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 5: (Continuation)

The detail of the balances of investments in associates and joint ventures is as follows:

The following table shows the breakdown of the result from investments in associates and joint ventures:

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 5: (Continuation)

The evolution of investments in associates and joint ventures is as follows:

Pursuant to the terms and conditions of the concession authorization agreement, OCP caused OCPSA to establish two guarantees, one operational and one environmental, each in the amount of US$ 50 million (including surety bonds provided by the Group as shareholder in the amount of US$ 84 million disclosed within non-current guarantee deposits), which would remain in effect for the term of the agreement and until 90 days after its termination on November 30, 2024. Therefore, the guarantees were scheduled to expire on March 1, 2025, since no claim that may be considered covered within their scope would have been initiated by that date. However, Citibank Ecuador informed OCP that, in its understanding, the guarantees had not expired because OCPSA had not complied with certain required formalities. On its part, OCP has formally notified Citibank Ecuador that its position is incorrect, explaining the reasons for that interpretation. As of the date of issuance of these Consolidated Condensed Interim Financial Statements, OCP has not received a response to this notification.

OCP has also requested the Ecuadorian Government to notify Citibank Ecuador of the guarantees’ expiration, having received no response as of the date of issuance of these Consolidated Condensed Interim Financial Statements.

OCP understands that there is no legal basis for claims under the operational guarantee (to be initiated only in case of a capacity deficiency pursuant to the concession authorization agreement) or under the environmental guarantee (to be initiated only in the event of termination of the concession authorization agreement due to the lack of payment of environmental compensations). In this regard, the guarantees should be terminated and rendered null and void, all in accordance with their terms and conditions.

OCP is taking all necessary actions to terminate the guarantees pursuant to the terms of the concession authorization agreement. On April 11, 2025, OCP filed an arbitration proceeding before the ICSID seeking the effective release of the guarantees and compensation for the damages sustained as a result of the failure to release them; and, subsidiarily, to receive from Ecuador the amount of the guarantees plus interest and damages resulting from Ecuador’s actions. As of the date of issuance of these Consolidated Condensed Interim Financial Statements, the Arbitration Court that will hear the arbitration has been constituted.

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 5: (Continuation)

On March 7, 2025, heavy rains, unprecedented in the last 100 years, were recorded in the city of Bahía Blanca and adjacent areas, causing flooding in all urban areas and their surroundings.

This event caused the Saladillo García stream to overflow, flooding the Cerri Complex and, consequently, halting the production of liquids and partially affecting natural gas transportation services. It is worth highlighting that the external electricity distribution system and the electricity generation and distribution facilities were also affected.

The natural gas transportation service was gradually restored in full, with no significant impact on TGS’s revenues. However, liquid production at the Cerri Complex was interrupted from March 7, 2025 to early May 2025.

In the six-month period ended June 30, 2025, TGS recorded a $ 33,573 million loss for event-related expenses and the impairment of materials and other property, plant and equipment. Even though the Cerri Complex is operating under normal conditions, as of the date of issuance of these Consolidated Condensed Interim Financial Statements, the final cost of the event has not yet been assessed by TGS.

Furthermore, TGS is undertaking preliminary coverage negotiations with insurance companies; therefore, the insurance proceeds’ amount and timing have not been determined as of the date of issuance of these Consolidated Condensed Interim Financial Statements.

Tender for Perito Moreno Gas Pipeline (GPM) Expansion

On May 22, 2025, ENARSA launched a tender to expand the GPM, aiming to increase natural gas transportation capacity from Vaca Muerta by 14 million cubic meters per day. On July 28, 2025, TGS submitted a tender, and the award is scheduled for October 13, 2025.

On July 8, 2025, VMOS entered into a syndicated international loan agreement for a total amount of US$ 2 billion with a 5-year term and an interest rate equivalent to SOFR Term plus a 5.50% margin, intended to finance the construction of the Vaca Muerta Oil Sur pipeline. The project requires a total estimated investment of US$ 3 billion and includes a loading and unloading terminal equipped with interconnected mooring buoys, a tank farm, and other associated accessory facilities for exporting oil and liquids through carriers. Likewise, VMOS amended the transportation agreements entered into with its shareholders to align its terms with the financing structure.

As security for the obligations assumed in the loan: (i) VMOS has assigned in guarantee to the banks its collection rights under the transportation contracts entered into with the initial shippers (YPF, Vista, Pampa, PAE, Pluspetrol, Chevron, Shell, Tecpetrol and GyP); (ii) each initial shipper entered into a direct agreement with the banks; and (iii) VMOS’s Class A shareholders (including Pampa) have granted a fiduciary assignment of their shares as collateral for the financing, which shall remain in effect until the completion of the project.

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 5: (Continuation)

Disbursements may be requested by VMOS on a monthly basis until the earlier of the project completion date or July 31, 2027.

Under the terms of the syndicated loan agreement, VMOS has undertaken certain customary affirmative and negative covenants for this type of transaction.

In addition, the revenues generated from VMOS’ export operations will be credited to an offshore bank account structure, which is managed by a bank acting as collateral agent. Furthermore, a local tariff guarantee trust has been established, under which a branch of Citibank, N.A. acting as trustee, will manage both the local revenues received by VMOS and any funds transferred from abroad.

5.2 Oil and gas participations

Assets and liabilities as of June 30, 2025 and December 31, 2024 and the production cost of the Joint Operations and Consortiums in which the Company participates corresponding to the six-month periods ended June 30, 2025 and 2024 are detailed below:

It is worth highlighting that the information presented does not include charges recorded by the Company as a member of the Joint Operations and Consortiums.

Extension of the evaluation period for the Parva Negra Este area

Through Provincial Executive Order No. 550/25, issued on May 17, 2025, the Province of Neuquen approved a 2-year extension of the evaluation period for the Parva Negra Este area from April 3, 2025 to April 2, 2027.

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 6: RISKS

6.1 Critical accounting estimates and judgments

The preparation of these Consolidated Condensed Interim Financial Statements requires the Company’s Management to make future estimates and assessments, to apply critical judgment and to establish assumptions affecting the application of accounting policies and the amounts of disclosed assets and liabilities, and income and expenses.

Those estimates and judgments are evaluated on a continuous basis and are based on past experiences and other reasonable factors under the existing circumstances. Actual future results might differ from the estimates and evaluations made at the date of preparation of these Consolidated Condensed Interim Financial Statements.

In the preparation of these Consolidated Condensed Interim Financial Statements, management judgements on applying the Company’s accounting policies and sources of information used for the respective estimates are the same as those applied in the Consolidated Financial Statements for the fiscal year ended December 31, 2024.

6.2 Financial risk management

The Company’s activities are subject to several financial risks: market risk (including the exchange rate risk, the interest rate risk and price risk), credit risk and liquidity risk.

No significant changes have arisen in risk management policies since last fiscal year.

NOTE 7: SEGMENT INFORMATION

The Company is a fully integrated power company in Argentina, which participates mainly in the production of oil and gas and power generation.

Through its own activities, subsidiaries and share holdings in joint ventures, and based on the business nature, customer portfolio and risks involved, the following business segments have been identified:

Oil and Gas, principally consisting of the Company’s interests in oil and gas areas, the activities of Pampa Energía S.A. - Sucursal Dedicada Midstream RDA and direct and indirect interest in SESA and PECSA.

Generation, principally consisting of the Company’s direct and indirect interests in HINISA, HIDISA, VAR, CTB, TMB, TJSM and through its own electricity generation activities through thermal plants CTG, CPB, Piquirenda, CTLL, CTGEBA, Ecoenergía, CTPP, CTIW, the HPPL hydroelectric complex and PEPE II, PEPE III, PEPE IV and PEPE VI wind farms.

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 7: (Continuation)

Petrochemicals, comprising of the Company’s own styrenics operations and the catalytic reformer plant operations conducted in local plants.

Holding, Transportation and Others, principally consisting of our stake in joint businesses CITELEC, CIESA and their respective subsidiaries holding the concession over high-voltage electricity transmission and gas transportation, respectively, the direct and indirect interests in VMOS and OCP, holding activities, and other investment activities.

The Company manages its operating segment based on its individual net result in U.S. dollars.

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 7: (Continuation)

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 7: (Continuation)

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 7: (Continuation)

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 7: (Continuation)

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 8: REVENUE

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 9: COST OF SALES

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 10: OTHER ITEMS OF THE STATEMENT OF COMPREHENSIVE INCOME

10.1 Selling expenses

10.2 Administrative expenses

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 10: (Continuation)

10.3 Other operating income and expenses

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 10: (Continuation)

10.4 Financial results

⁽¹⁾ Net of US$ 1 million and US$ 7 million borrowing costs capitalized in property, plant and equipment corresponding to the six-month period ended June 30, 2025 and 2024, respectively.

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 10: (Continuation)

10.5 Income tax

The breakdown of income tax charge is:

Below is a reconciliation between income tax expense and the amount resulting from application of the tax rate on the profit before taxes:

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 11: NON-FINANCIAL ASSETS AND LIABILITIES

11.1 Property, plant and equipment

⁽¹⁾ Includes US$ 1 million and US$ 7 million of borrowing costs capitalized for the six-month period ended June 30, 2025 and 2024, respectively.

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 11: (Continuation)

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 11: (Continuation)

11.2 Intangible assets

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 11: (Continuation)

11.3 Deferred tax assets and liabilities

The composition of the deferred tax assets and liabilities is as follows:

Deferred tax assets and liabilities are offset only when there is a legally enforceable right to offset tax assets and liabilities; and when deferred income tax charges are associated with the same fiscal authority. Therefore, they are disclosed in the Consolidated Condensed Interim Statement of Financial Position:

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 11: (Continuation)

11.4 Inventories

11.5 Provisions

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 11: (Continuation)

The evolution of provisions is shown below:

Provision for legal proceedings

In the ongoing files before the National Tax Court regarding gasoline exports, where the tax entity challenges the tariff heading assigned by Petrobras Argentina S.A. during the years 2008-2014, eight additional favorable rulings were passed during the period. Out of the total thirteen rulings in favor of the Company, twelve were sustained by the Tax Authority, therefore becoming final and conclusive. In the remaining case, the term for the Tax Authority to submit an appeal is still pending. Attending to the above-mentioned detailed progress, the Company believes that there are grounds to consider that the associated provision is not probable and, consequently, has recorded, during the period a US$ 44 million recovery, including accrued interest.

In the appeal for partial annulment filed by the Company against the Final Award issued in the international arbitration proceeding initiated by POSA, the latter answered the service of notice, and on July 15, 2025, a hearing was held before the National Chamber of Appeals in Commercial Matters.

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 11: (Continuation)

11.6 Income tax and minimum notional income tax provision

NOTE 12: FINANCIAL ASSETS AND LIABILITIES

12.1 Financial assets at amortized cost

Due to the short-term nature of investments at amortized cost, their book value is not considered to differ from their fair value.

NOTES TO THE UNAUDITED CONSOLIDATED CONDENSED INTERIM FINANCIAL STATEMENTS (Continuation) For the six-month period ended June 30, 2025, presented on comparative basis. (In millions of US$ – unless otherwise stated)

NOTE 12: (Continuation)

12.2 Financial assets at fair value through profit and loss