Environmental Impact Assessment

for the Tweneboa, Enyenra, Ntomme (T.E.N.) development project

Tullow Ghana Limited (TGL) has interests in two oil concession blocks offshore Ghana, namely Deepwater Tano (DWT) and West Cape Three Points.  In 2009 to 2010, TGL and its Partners (Kosmos Energy LLC, Anadarko Petroleum Corporation, Ghana National Petroleum Company and Sabre Oil and Gas) developed the Jubilee oil field located approximately 60 km offshore Ghana (Figure 1).  Oil production started in December 2010 through the Kwame Nkrumah Floating Production Storage and Offloading (FPSO) vessel.

Further exploration and appraisal drilling in the DWT block during 2009 and 2010 resulted in the discovery of the Tweneboa, Enyenra and Ntomme (T.E.N.) fields.  The fields are situated approximately 60 km offshore, 30 km to the west of the Jubilee Field and lie in water depths ranging between 1,000 m and 1,800 m (see Figure 1).  TGL and the DWT Partners (Kosmos Energy LLC, Anadarko Petroleum Corporation, Ghana National Petroleum Company) are now proposing to develop the T.E.N. fields.  TGL is the designated operator for the DWT block and will lead the project design, execution and operation phases of the proposed development.

Environmental Impact Assessment

Under the Ghana Environmental Assessment Regulations (LI 1652 1999), Tullow and Partners are required to submit an Environmental Impact Statement (EIS) describing the project and providing an assessment of the potential impacts from the proposals and the proposed measures to be taken to manage these impacts.

EIA documentation is available here to be downloaded in a series of PDF documents.

Figure 1: Location of the T.E.N. fields
Click image for larger view

The T.E.N. development will consist of oil and gas production wells, water injection wells and gas injection wells.  Production will be gathered through subsea manifolds and conveyed by subsea flowlines to a FPSO which will be moored in the area of the T.E.N. fields.  A peak oil production rate of 100,000 barrels per day by 2018 is expected and a total oil recovery of approximately 216 million barrels by 2040.  The existing onshore support bases at Takoradi Port and Air force Base will be used.  Subsea equipment installation is planned throughout 2014 and the target for first production is 2015.

EIA Team

TGL commissioned Environmental Resources Management (ERM) in collaboration with two Accra-based consultancies namely ESL Consulting and SRC Consulting to undertake the EIA for the T.E.N. development.

File Downloads

Background Information Document (1MB PDF)

Scoping Report and Terms of Reference 

Main Report (2MB PDF)


Part 1 (2MB PDF)

Part 2 (2MB PDF)

Part 3 (2MB PDF)

Part 4 (2MB PDF)

Part 5 (1MB PDF)

Scoping Report Summary Presentation (686KB PDF)

Community consultation Q&A (80KB PDF)

Future downloads will include:

Environmental Impact Statement

  • Main Report
  • Annexes