<h1>Greater Tortue Ahmeyim Gas Project (Senegal,Mauritania)</h1>
<p>The Greater Tortue Ahmeyim Gas Project is a cross-border offshore gas and LNG development located on the maritime boundary between Senegal and Mauritania. Operated by BP,the project began first gas flow in early January 2025,achieved first LNG in February 2025,and loaded its first LNG cargo in April 2025. The discovery dates to 2014 (project records) or 2015 (Kosmos Energy),and the final investment decision for Phase 1 was taken in December 2018. The partnership includes BP (56% interest),Kosmos Energy (27%),Petrosen (10%),and Société Mauritanienne des Hydrocarbures et de Patrimoine Minier (7%). Phase 1 comprises deepwater subsea production,an FPSO,a floating LNG facility,and a nearshore hub terminal.</p>

<h2>Quick Facts</h2>
<table>
<tbody>
<tr><th>Item</th><th>Detail</th></tr>
<tr><td>Project Name</td><td>Greater Tortue Ahmeyim Gas Project</td></tr>
<tr><td>Country</td><td>Senegal; Mauritania</td></tr>
<tr><td>Fuel Type</td><td>Gas</td></tr>
<tr><td>Production Type</td><td>Conventional</td></tr>
<tr><td>Status</td><td>Operating</td></tr>
<tr><td>Status Year</td><td>2025</td></tr>
<tr><td>Operator</td><td>BP</td></tr>
<tr><td>Owner(s)</td><td>BP PLC 56%; Kosmos Energy Ltd 27%; Societé des Pétroles du Sénégal (Petrosen) 10%; Société Mauritanienne des Hydrocarbures et de Patrimoine Minier 7%</td></tr>
<tr><td>Discovery Year</td><td>2014</td></tr>
<tr><td>Final Investment Decision Year</td><td>2018</td></tr>
<tr><td>Production Start Year</td><td>2025</td></tr>
<tr><td>Onshore/Offshore</td><td>Offshore</td></tr>
<tr><td>Basin</td><td>Mauritania-Senegal deep-water gas basin</td></tr>
<tr><td>Block(s)</td><td>C-8 (Mauritania); Saint-Louis Offshore Profond (Senegal)</td></tr>
</tbody>
</table>

<h2>Location and Basin</h2>
<p>Greater Tortue Ahmeyim lies offshore Senegal and Mauritania in the Atlantic Ocean,near the maritime border. The development covers the C-8 block offshore Mauritania and the Saint-Louis Offshore Profond block in Senegal. Geologically it belongs to the Mauritania-Senegal deep-water gas basin. Water depths reach up to 2,850 metres. The nearshore hub and floating LNG facility are positioned closer to shore while the subsea wells are in deepwater.</p>

<h2>Ownership and Operatorship</h2>
<p>BP operates the project with a 56% interest. Kosmos Energy holds 27%,Petrosen (Senegal) holds 10%,and SMHPM (Mauritania) holds 7%. BP Gas Marketing was selected as buyer for Phase 1 LNG offtake. In October 2024 an arbitration ruling confirmed BP as sole buyer of Kosmos Energy’s LNG volumes under the sales agreement.</p>

<h2>Development History</h2>
<p>The Greater Tortue Ahmeyim gas accumulation was discovered by Kosmos Energy in 2014 (project records) or 2015 (Kosmos description). The final investment decision for Phase 1 was announced in December 2018 after agreement among BP,Kosmos,Petrosen,and SMHPM. Initial schedules targeted earlier start-up but the project faced delays during offshore construction,integration,and commissioning. First gas flowed from wells to the FPSO on 31 December 2024. First LNG production followed in February 2025,and the first LNG cargo was loaded in April 2025,marking the start of LNG exports.</p>

<h2>Infrastructure and Facilities</h2>
<p>Phase 1 infrastructure includes a deepwater subsea production system,an FPSO for gas and condensate processing,and a floating LNG facility. The FLNG vessel,Gimi supplied by Golar LNG,has a nameplate capacity of 2.7 million tonnes per annum (mtpa). Average design capacity is reported at 2.5 mtpa; expected output is around 2.3 mtpa. A nearshore hub terminal protected by a concrete caisson breakwater supports LNG carrier loading. Condensate is recovered at the FPSO.</p>

<h2>Production and Reserves</h2>
<p>First gas reached the FPSO at end‑2024,first LNG was produced in February 2025,and the first LNG cargo (approximately 174,000 cubic metres) was loaded in April 2025. Production is in ramp‑up. Global Energy Monitor reports total gas reserves of 566,000 million cubic metres (2021 data) and recoverable reserves of 424,755 million cubic metres (2022 data). Partner sources refer to total recoverable gas of around 15 trillion cubic feet. Phase 1 designed LNG capacity is 2.3–2.7 mtpa depending on the definition. A stabilized long‑term production plateau has not been publicly confirmed.</p>

<h2>Recent Developments</h2>
<p>During commissioning in March 2025,a low‑rate subsea gas bubble leak was detected at well GTA A02. BP stated the environmental impact was negligible and operations continued; Mauritania’s environment ministry said it was investigating. The first LNG cargo in April 2025 made Mauritania and Senegal LNG‑exporting countries. The October 2024 arbitration ruling confirmed BP as sole buyer of Kosmos’ LNG volumes from Phase 1.</p>

<h2>Related Topics</h2>
<ul>
<li>Greater Tortue Ahmeyim LNG Phase 1</li>
<li>BP offshore Senegal and Mauritania</li>
<li>Kosmos Energy Greater Tortue</li>
<li>Petrosen upstream projects</li>
<li>SMHPM Mauritania hydrocarbons</li>
<li>West Africa LNG exports</li>
<li>Floating LNG technology</li>
<li>Deepwater subsea gas developments</li>
<li>FPSO gas processing</li>
<li>Cross-border offshore unitization</li>
<li>Senegal oil and gas industry</li>
<li>Mauritania oil and gas industry</li>
<li>Saint-Louis Offshore Profond block</li>
<li>C-8 offshore Mauritania block</li>
</ul>

<h2>Sources</h2>
<ul>
<li><a href="https://www.gem.wiki/Greater_Tortue_Ahmeyim_Gas_Project_%28Senegal%2C_Mauritania%29" target="_blank">Global Energy Monitor: Greater Tortue Ahmeyim Gas Project (Senegal,Mauritania)</a></li>
<li><a href="https://www.gem.wiki/Greater_Tortue_Ahmeyim_FLNG_Terminal" target="_blank">Global Energy Monitor: Greater Tortue Ahmeyim FLNG Terminal</a></li>
<li><a href="https://www.bp.com/en/global/corporate/news-and-insights/press-releases/bp-flows-first-gas-at-greater-tortue-ahmeyim-lng-project.html" target="_blank">BP: First Gas at Greater Tortue Ahmeyim LNG Project</a></li>
<li><a href="https://www.bp.com/en/global/corporate/news-and-insights/press-releases/bp-completes-loading-first-cargo-from-greater-tortue-ahmeyim-lng-project.html" target="_blank">BP: First LNG Cargo from Greater Tortue Ahmeyim LNG Project</a></li>
<li><a href="https://www.bp.com/en_sn/senegal/home/where-we-operate.html" target="_blank">BP Senegal: Where We Operate</a></li>
<li><a href="https://www.kosmosenergy.com/greater-tortue/" target="_blank">Kosmos Energy: Greater Tortue</a></li>
<li><a href="https://investors.kosmosenergy.com/news-releases/news-release-details/kosmos-energy-announces-final-investment-decision-phase-1" target="_blank">Kosmos Energy: Final Investment Decision for Greater Tortue Ahmeyim Phase 1</a></li>
<li><a href="https://investors.kosmosenergy.com/news-releases/news-release-details/kosmos-energy-announces-first-lng-greater-tortue-ahmeyim-project" target="_blank">Kosmos Energy: First LNG at Greater Tortue Ahmeyim</a></li>
<li><a href="https://investors.kosmosenergy.com/news-releases/news-release-details/kosmos-energy-ltd-first-lng-cargo-greater-tortue-ahmeyim-project" target="_blank">Kosmos Energy: First LNG Cargo at Greater Tortue Ahmeyim</a></li>
<li><a href="https://www.reuters.com/business/energy/arbitration-rules-favour-bp-sole-buyer-kosmos-energys-senegal-lng-project-2024-10-08/" target="_blank">Reuters: Arbitration Ruling on Greater Tortue Ahmeyim LNG Sales</a></li>
<li><a href="https://www.reuters.com/business/energy/bp-says-gas-bubbles-discovered-senegal-mauritania-gta-project-2025-03-05/" target="_blank">Reuters: Gas Bubbles Detected at Greater Tortue Ahmeyim During Commissioning</a></li>
<li><a href="https://www.offshore-technology.com/projects/greater-tortue-ahmeyim-gta-lng-project-mauritania-and-senegal/" target="_blank">Offshore Technology: Greater Tortue Ahmeyim LNG Project</a></li>
<li><a href="https://www.nsenergybusiness.com/projects/greater-tortue-ahmeyim-lng-project/" target="_blank">NS Energy: Greater Tortue Ahmeyim LNG Project</a></li>
<li><a href="https://www.bp.com/content/dam/bp/country-sites/en_mr/mauritania/home/pdf/esia/esia_gta1_c_en_1906_vol1.pdf" target="_blank">BP: Greater Tortue Ahmeyim Phase 1 Environmental and Social Impact Assessment</a></li>
</ul>

IEPTC reference profile for Greater Tortue Ahmeyim Gas in Senegal,Mauritania,covering asset type,location,development status,and upstream industry context.

Greater Tortue Ahmeyim Gas Project (Senegal,Mauritania)

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Greater Tortue Ahmeyim Gas Project (Senegal,Mauritania)

Greater Tortue Ahmeyim Gas Project (Senegal,Mauritania)

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