Mauritania and Senegal 2026: GTA first cargo, BP and Kosmos cash flow, and the MSGBC basin's 50 Tcf moment

GTA Phase 1: 2.5 mtpa, BP operatorship, and the FLNG configuration #

Greater Tortue Ahmeyim sits on the maritime border between Mauritania and Senegal, 120 kilometers offshore in water depths of 2,850 meters. The unitization agreement signed in February 2018 by the two governments allocates production 50 to 50 across the line. Phase 1 routes feed gas through a hub of subsea trees and umbilicals into an FPSO that strips condensate and water, then forwards the dry gas roughly 10 kilometers via pipeline to the Gimi FLNG, a converted Moss type LNG carrier hosted under a 20 year lease and operate contract by Golar LNG, now Cool Company and Seatrium aligned. Nameplate liquefaction is 2.5 million tonnes per annum (around 3.4 bcm of dry gas equivalent), of which roughly 2.45 mtpa is contracted to BP Gas Marketing for resale into European and Asian portfolios.

First gas was achieved on December 31, 2024, more than five years after the original 2019 sanction and three years after the first gas target of mid 2023, with slippage driven by Yantai CIMC Raffles yard delays on the Gimi FLNG, COVID era contractor mobilization, and a 2022 dispute with Senegalese authorities over local content. The first commissioning cargo loaded at the GTA hub on February 19, 2025, on the BP Pioneer (Kosmos Energy Q1 2025 release). Ramp to nameplate is targeted across 2025 and 2026, with full year 2026 guidance of around 2.3 mtpa from BP's February 2026 trading statement.

The wider basin: Yakaar Teranga, BirAllah, and 50 plus Tcf gross #

The MSGBC basin, named for Mauritania, Senegal, Gambia, Guinea Bissau, and Guinea Conakry, has been re rated since the Tortue and Ahmeyim discovery in 2015 from a frontier curiosity to a top three African gas province. Kosmos Energy's 2024 Form 10 K reports gross resource of around 15 Tcf at GTA, around 13 Tcf at BirAllah (the former Marsouin, Orca, and Bambo discovery cluster offshore Mauritania), and substantially larger volumes at Yakaar and Teranga in Senegal where BP took operatorship in a 2020 swap. The combined gross contingent and prospective resource for the basin exceeds 50 Tcf, broadly in line with the IEA Africa Energy Outlook 2024 estimate.

The portfolio split is asymmetric. GTA splits revenue equally between Mauritania and Senegal under the 2018 unitization. BirAllah is wholly Mauritanian. Yakaar Teranga is wholly Senegalese, and the Faye and Sonko government has signaled that the next phase of Yakaar should prioritize gas to power for the Senelec grid before LNG export. Kosmos Energy disclosed in its 2024 Capital Markets Day that BirAllah Phase 1 development concept is sized for 2.5 to 5.0 mtpa LNG with FID in 2026 or 2027, leveraging some Phase 1 GTA infrastructure to compress capex below USD 1,000 per tonne of LNG capacity, against an industry average of USD 1,200 to USD 1,400.

The Senegalese macro: 8.4 percent in 2024, 9.9 percent forecast for 2025 #

The IMF Article IV consultation for Senegal, concluded in December 2024, reported real GDP growth of 8.4 percent in 2024 and projected 9.9 percent for 2025, with 6.0 percent thereafter. The hydrocarbon contribution is direct: Sangomar oil came onstream in June 2024 with a 100,000 barrel per day plateau (Woodside Q3 2024 quarterly report), and GTA gas added a smaller but material accretion in late 2024. The current account, which had averaged a deficit of 13 to 17 percent of GDP between 2018 and 2023 on the back of GTA capex imports, is forecast to narrow to 7.4 percent of GDP in 2025 and to flip toward balance by 2027 on hydrocarbon exports.

Fiscal results have been less clean. The IMF disclosed in November 2024 that the previous Sall government had understated debt by an amount equivalent to roughly 7 percent of GDP, lifting the public debt ratio to around 84 percent of GDP at end 2023, well above the WAEMU convergence ceiling of 70 percent. The Faye and Sonko government, elected in March 2024 with a first round 54 percent share for President Bassirou Diomaye Faye, has paused IMF program disbursements pending audit and renegotiation. S and P downgraded Senegal to B minus in October 2024 and Moody's to B3 in December 2024. The hydrocarbon revenue ramp, projected by the IMF at around 2.5 percent of GDP in 2026 and 4 to 5 percent of GDP at the GTA and Sangomar plateau, is the central condition for a return to investment grade trajectory through 2030.

Mauritania: hydrocarbons, iron ore, gold, and the AfDB grid integration #

Mauritania's macro is more conservative and more diversified than the Senegalese pivot suggests. The IMF Article IV of June 2024 reported real GDP growth of 6.5 percent in 2023, 4.6 percent in 2024 (provisional), and a 5.1 percent forecast for 2025, with the GTA contribution running close to the Senegalese figure on a per capita basis (Mauritania has 4.9 million people against Senegal's 18 million). Hydrocarbons are not the only export story. Kinross Gold's Tasiast mine produced 622,000 ounces in 2024 (Kinross Gold 2024 Annual Report), and SNIM, the state owned iron ore company, shipped roughly 13.5 million tonnes in 2024 against a peak of 13.0 million tonnes a decade earlier (SNIM annual report 2024).

The grid story is the AfDB and World Bank financed expansion of the West African Power Pool, with a 225 kV interconnector between Mauritania and Senegal forming the spine of the Organization for the Development of the Senegal River (OMVS) integration, and a 1,677 kilometer 225 kV Mauritania, Mali, Senegal loop completed in segments through 2024 and 2025. The AfDB approved a USD 302 million package in 2024 for the Mauritania Mali line and a complementary USD 320 million Senegal River Basin Multipurpose Water Resources Development Project second phase. GTA gas to power, channeled through a planned 225 MW combined cycle plant at Saint Louis on the Senegalese side and a 180 MW unit on the Mauritanian side, is the demand anchor that converts the export project into a regional grid story.

Senegal's downstream complement is the Senegal Society of Refining (SAR), the country's only refinery, which has run at around 1.2 million tonnes per year of crude throughput (Petrosen and SAR data, 2024). SAR has commissioned a USD 110 million debottlenecking program in 2024 to lift capacity toward 1.5 million tonnes and to enable use of GTA condensate as a domestic feed slate, reducing imported product dependence.

Geopolitics: AES Sahel pressure, ECOWAS swing, and the Wagner overhang #

The MSGBC basin sits on the Atlantic edge of a region under acute pressure. The Alliance of Sahel States (AES), a confederation of Mali, Burkina Faso, and Niger formalized in July 2024, has expelled French forces, withdrawn from ECOWAS effective January 2025, and turned formally toward Russian Africa Corps (the post Prigozhin successor to Wagner Group) for security assistance. Mauritania has shared a 2,237 kilometer border with Mali since independence. The country has held to a non aligned posture under President Mohamed Ould Ghazouani, reelected in June 2024 with 56 percent of the vote, but has absorbed an estimated 165,000 Malian refugees as of UNHCR's December 2024 update at the Mbera camp.

Senegal's Faye and Sonko government has positioned itself as a constructive bridge inside ECOWAS, opposing the Sahel withdrawal but seeking dialogue. The implication for offshore gas is real but contained. GTA, BirAllah, and Yakaar are 100 to 200 kilometers offshore in deep water and have no plausible kinetic exposure. The risks are political and contractual: contract review, fiscal renegotiation, local content escalation, and disruption to the joint regulator (the Inter State Cooperation Commission established by the 2018 unitization). The US State Department's March 2025 country reports identify regulatory and judicial unpredictability as the binding investor risk, not security. The Africa Finance Corporation, AfreximBank, and Standard Chartered have all retained financing exposure to Phase 2 GTA on that read.

2026 outlook: ramp, FID, and the cash flow pivot #

Three near term decisions structure the next 18 months. First, GTA Phase 1 ramp from 2.3 mtpa actual in 2026 toward 2.45 mtpa contracted in 2027, with around 95 percent of cargoes lifted by BP Gas Marketing under the long term offtake. At a TTF benchmark of USD 11 per million British thermal units, gross revenue at plateau approximates USD 1.5 billion per year, of which Mauritania and Senegal capture together around USD 250 to USD 350 million in royalty, profit gas, and tax through 2027 (rising materially with Phase 2). Second, BirAllah FID in 2026 or 2027, which would commit USD 5 to USD 8 billion of incremental capex by Kosmos Energy and BP and lift basin LNG capacity toward 5 to 7 mtpa by 2030. Third, Senegalese contract review outcomes, where the Faye and Sonko government has set a target of 30 percent local content and increased domestic gas allocation, against the production sharing contract terms inherited from 2017.

The corporate cash flow pivot is concentrated. Kosmos Energy guided in its Q1 2025 release for free cash flow of USD 350 to USD 500 million in 2025 at USD 75 Brent and USD 11 TTF, against negative free cash flow in the GTA build years. BP, where MSGBC is a smaller share of group, captures a structural margin uplift on the trading book through BP Gas Marketing offtake. The Africa LNG league table shifts: Nigeria LNG at 22 mtpa, Mozambique Coral South plus Coral Norte at 7 mtpa by 2028, MSGBC GTA at 2.5 mtpa rising toward 5 to 7 mtpa, Egypt Idku and Damietta around 12 mtpa subject to feedstock. MSGBC enters the Africa top three by sanctioned capacity through 2030.

The strategic implication for buyers is to treat MSGBC as a structurally lower cost addition to the Atlantic LNG supply stack, with breakeven in the USD 6 to USD 7 per million British thermal units range against North American greenfield at USD 8 to USD 10. Political risk is real and manageable: contract review will lift fiscal terms toward 50 to 55 percent government take from the current 45 percent without breaking commercial logic, and AfDB and World Bank grid financing locks in domestic gas to power demand that floors the project against export market shocks. For Senegalese sovereign credit, the path back to single B plus and BB minus runs through Phase 2 sanction and current account turnaround by 2027. For Mauritania, green hydrogen optionality at the AMAN and Nour projects under H2 Aman with CWP Global and Chariot, both in FEED, extends the basin story into the 2030s.

Sources #

• BP plc 2024 Annual Report and Form 20 F, GTA disclosures
• Kosmos Energy 2024 Form 10 K and Q1 2025 earnings release
• Petrosen, Senegal national oil company, project disclosures
• SMHPM, Societe Mauritanienne des Hydrocarbures, sector disclosures
• IMF Article IV consultation, Senegal, December 2024
• IMF Article IV consultation, Mauritania, June 2024
• World Bank Senegal Country Partnership Framework and macro updates
• World Bank Mauritania Country Partnership Framework
• African Development Bank, Mauritania Mali Senegal interconnector and OMVS projects
• AfreximBank, African energy sector financing disclosures
• IEA Africa Energy Outlook 2024 and Gas Market Report Q1 2025
• OPEC Monthly Oil Market Report, country supply tables
• Woodside Energy quarterly reports, Sangomar production
• Kinross Gold 2024 Annual Report, Tasiast mine production
• SNIM, Societe Nationale Industrielle et Miniere, annual report 2024
• US State Department, Mauritania and Senegal investment climate statements 2024 and 2025
• Reuters Dakar and Nouakchott bureau coverage of GTA milestones, 2024 and 2025
• Golar LNG and Cool Company disclosures on Gimi FLNG