Pampa Energía's $1.5 billion development push at a single Vaca Muerta block has multiplied the company's crude output 4.5-fold in twelve months, transforming what was primarily a thermal power generator into an integrated oil producer — a shift documented in the 20-F annual report, the filing required of U.S.-listed foreign issuers, that Pampa Energía, a diversified Argentine energy company, submitted to the U.S. Securities and Exchange Commission.
The filing captures one of the more compressed corporate transformations in Vaca Muerta's recent history: a block that had two producing wells at the close of 2024 and averaged 17,100 bbl/d from 28 wells by year-end 2025. Proved shale reserves now represent 69% of Pampa's total. A company that defined itself for over a decade by thermal generation and gas supply contracts has begun to resemble, in its numbers and its strategy, something different.
Whether that trajectory holds will depend on factors the annual report cannot yet resolve — among them the pace of permanent infrastructure commissioning at the block, the durability of the new wholesale electricity framework, and the outcome of a stake sale in Citelec, the holding company that controls Transener, Argentina's main high-voltage transmission operator, now days from its bid deadline.
Reserves: One Block, a 352% Jump
Pampa closed 2025 with total proved reserves of 296 million barrels of oil equivalent (BOE), up 28% from 231 million BOE a year earlier.
The driver was Rincón de Aranda, which added 43.7 million new certified barrels — a 352% increase — according to a reserve certification by GaffneyCline, the Baker Hughes-owned independent petroleum consultancy. Sierra Chata contributed another 28 million BOE, up 41%. In aggregate, proved shale reserves grew 54% to 204 million BOE. The reserve replacement ratio reached 3.2x production for the period, and reserve life extended from 8.6 to 10.2 years.
The Block That Concentrates the Investment
Capital allocation tells the story more plainly than any strategy presentation. Pampa directed $1.039 billion toward its oil and gas segment in 2025 — nearly triple the $354 million invested the prior year. In the fourth quarter alone, 75% of that capex went to Rincón de Aranda.
Total development capex for the block exceeds $1.5 billion, the largest single-asset commitment in Pampa's history, with a projected plateau of 45,000 bbl/d by 2027.
The portfolio shift is equally visible in what Pampa divested. Total producing wells fell from 688 to 470 between December 2024 and December 2025, reflecting the October 2025 sale of the El Tordillo and La Tapera-Puesto Quiroga conventional blocks in Chubut province's San Jorge Gulf Basin. Mature conventional output exits; shale enters. The portfolio contracts; production expands.
On lifting costs, volume dilution is already apparent. Cost per BOE fell 8% in the fourth quarter to $8.0, even as Aranda continues to carry temporary processing facility costs. For the full year, the figure rose 14% to $7.2/BOE — but the quarterly trend is declining as permanent infrastructure approaches commissioning.
Self-Supplying Gas to Its Own Plants
If the first leg of the transformation was Aranda crude, the second activated November 1, 2025, when Resolution 400/2025 issued by Argentina's Secretariat of Energy took effect.
The framework normalized Argentina's wholesale electricity market, introduced marginal pricing for spot dispatch, and decentralized fuel procurement: CAMESSA, the Argentine wholesale electricity market administrator, no longer centrally purchases gas on behalf of thermal generators. Generators now self-supply.
Pampa acted quickly. In December 2025, following CAMESSA's approval of a pass-through of up to 4.9 MMm³/d from Plan Gas — Argentina's government gas supply program — across Rounds 1 and 3, the company redirected its own gas production toward its two most efficient combined-cycle plants: Central Térmica Loma La Lata and Central Térmica Genelba. Self-supply represented 10% of Pampa's gas production in December 2025 and rose to 29% in January 2026.
Under marginal pricing, a combined-cycle plant that self-supplies gas captures the spread between its own fuel cost and the system's marginal clearing price. For a company producing gas in Vaca Muerta at competitive costs and operating plants with high capacity factors, vertical integration generates a margin superior to what Pampa earned selling gas to CAMESSA at regulated prices and collecting power revenues at administered tariffs.
The fourth quarter already reflects the effect. Gross generation margin rose to $26.6/MWh, up 16% year-on-year. Adjusted EBITDA in the generation segment reached $111 million, 28% above the fourth quarter of 2024. Thermal availability improved to 93.2%.
The Financials of the New Model
At the consolidated level, Pampa recorded revenue of $507 million in the fourth quarter (+16%) and adjusted EBITDA of $230 million (+26%). Net income attributable to shareholders was $161 million, up 52% year-on-year. For the full year, adjusted EBITDA exceeded $1 billion for the first time.
Net debt closed at $801 million at year-end, down from $874 million at the close of September. In November, the company placed a Series 26 bond of $450 million with a 2037 bullet maturity and a 7.75% coupon — the first long-dated bond issued by an Argentine private company in over a decade. The transaction nearly doubled the group's average debt maturity to approximately eight years.
A note on realization prices: crude realization was $60.9/bbl in the fourth quarter, net of export duties and discounts. Without the hedging instruments active since April 2025, that figure would have been $53.4/bbl. The $7.5/bbl hedging contribution is material in an environment where Brent is under pressure. Exports represented 48% of volumes sold, up from 41% a year earlier.
What Comes Next: Upstream RIGI and the Citelec Variable
Two developments outside the earnings results set the forward trajectory.
Argentina's Large Investment Incentive Regime (RIGI) was extended by Executive Decree 105/2026 — an executive decree, a legislative instrument Argentina's executive branch can issue without Congressional approval — published in the Official Gazette on February 19. The extension runs through July 8, 2027 and incorporates hydrocarbon production from new onshore developments, with a minimum investment threshold of $600 million for upstream projects. Pampa developed Aranda under the RIGI's midstream provisions; the upstream extension allows the company to accelerate development of the block's northern zone and advance the ramp-up toward its production plateau.
The second variable is Citelec. ENARSA, Argentina's state-owned energy company, is selling a 50% stake in Citelec, with bids due within days. Pampa holds the remaining 50%, making it a passive but material participant in the outcome. Transener's adjusted EBITDA attributable to Pampa's stake was $19 million in the fourth quarter, up from $11 million a year earlier, driven by a cumulative tariff adjustment of 93.5% in 2025 that outpaced both inflation and currency depreciation.
Twelve months ago, Pampa Energía was defined by its thermal plants and gas contracts. A single block in Vaca Muerta changed its production profile; one regulatory resolution opened the door to monetizing its gas inside its own value chain.