Government approves eighth offshore petroleum development project; ExxonMobil to spend US$12.5B on project
Guyana approved ExxonMobil's Longtail Project, an offshore petroleum development with a $12.5B investment. The project, operated by ExxonMobil, Hess, and CNOOC, targets nine reservoirs in the Stabroek Block, with production expected to start before 2030. It will be Guyana's first Non-Associated Gas project, featuring a new FPSO vessel and supporting the country's gas industrial plans.
How this was made

The 30-second read
Why it matters
The approval introduces a $12.5 B capex project with 1.2 Bcf/d gas handling capacity, expanding the asset base of Exxon, Hess and CNOOC.
Market read
The project adds significant gas reserves and production capacity, likely supporting the share prices of the three partners and the broader offshore energy sector.
What to watch
Potential regulatory, environmental, or financing risks could affect project timelines and cost overruns.
Background
Guyana’s government approved its eighth offshore development, the Longtail Project, marking the country’s first non‑associated gas venture.
Ticker impact
ExxonMobil Guyana unit received government approval for the $12.5 B Longtail offshore gas project.
potential upside as investors price in new gas reserves and future production.
The project is a first non‑associated gas development for Guyana, with a 30‑year horizon and $12.5 B capex, representing material growth for Exxon’s offshore portfolio.
Market effects
strengthens the offshore oil & gas sector and highlights Guyana as a growing gas hub.
boosts investor sentiment toward Caribbean energy assets and related service providers.
adds to global gas supply outlook, supporting long‑term energy demand forecasts.
Counterpoint
The project's long lead time and capital intensity may delay near‑term earnings impact, limiting short‑term upside.
Key entities
- CompanyExxonMobil Guyana Limited
Operator of the Longtail project.
- CompanyHess Guyana Exploration Limited
Co‑venturer on the Longtail project.
- CompanyCNOOC Petroleum Guyana Limited
Co‑venturer on the Longtail project.

