TULLOW DATA IN DETAILThese pages provide the reader with the base data found in this report and information on key corporate policies and systems. In addition to this, the basis of reporting and GRI Content Index are published online at www.tullowoil.com/crr2011/bor and www.tullowoil.com/crr2011/gri respectively.81www.tullowoil.comSUPPLEMENTARY INFORMATIONSupplementary information4ENVIRONMENTAL PERFORMANCE20112010200920082007AtmosphericsCO2 emissions (tonnes)*1,223,983265,43786,543193,109234,462CH4 emissions (tonnes)*7,2671,39524+214314Tonnes CO2 /thousand tonnes hydrocarbon produced*2321788988124Tonnes CH4 /thousand tonnes hydrocarbon produced*1.380.930.02+0.100.17Production emissionsCO2 (tonnes)*1,069,890125,928++7,829179,143199,198CH4 (tonnes)*7,0901,24214+171167Drilling emissionsCO2 (tonnes)*130,732115,194++78,01911,33423,597CH4 (tonnes)*7.350.097+0.801Well test emissionsCO2 (tonnes)*23,36224,3156952,63211,667CH4 (tonnes)*1691523+42150Water usageWater usage (m3) - all operational sites*10,408,240107,42371,68362,38039,496WasteTotal waste (tonnes)*32,707----Recycled/Reused/Treated (%)*84.29----Spills Oil and chemical spills*144561Oil and chemical spills (tonnes)*3114.59+++0.94trace1.4* Indicates data reviewed by Deloitte as part their assurance work. See page 80 for the independent assurance report.+ This 2009 data has been restated using an updated conversion factor.++ The 2010 figure for production and drilling CO2 emissions (tonnes) includes an estimated split in total emissions for Ghana. A new system is in place to avoid these assumptions for 2011. +++ The 2010 figure for oil and chemical spills (tonnes) excludes an unknown quantity of black and grey water spilled in Bangladesh.

82Tullow Oil plc 2011/2012 Corporate Responsibility ReportSupplementary information continuedSAFETY PERFORMANCE2011 stretch target2011 base target20112010200920082007Hours worked (million)*--13.38.36.65.65.1Number of employee fatalities*--00000Number of contractor fatalities*--1+0100Number of third party fatalities*--00110Lost Time Injuries (LTIs)*n/an/a575310Lost Time Injury Frequency Rate (LTIFR)1*<0.5<0.760.380.850.760.541.95OGP LTIFRn/an/a0.43++ 0.420.460.550.67Total Recordable Injuries (TRI)* 3628202865Total Recordable Injury Frequency Rate (TRIFR)2*<2.5<32.713.383.045.0112.73OGP TRIFR2n/an/a1.76++1.681.792.112.71High Potential Incidents (HiPos)*--1211102429High Potential Incident Frequency Rate (HiPoFR)3<1.0<1.20.91.331.520.9n/aKilometres driven ('000,000)--8.254.23.26-Vehicle Accident Frequency Rate (VAFR)4<0.8<1.01.460.591.764.91-* Indicates data reviewed by Deloitte as part of their assurance work. See page 80 for the independent assurance report. + This was a work related fatality as a result of contracting malaria. Malaria cases are defined as illness incidents.+ + Draft OGP numbers, final numbers not yet published.1 The number of LTIs per million hours worked.2 The number of TRIs per million hours worked.3 The number of HiPos per million hours worked.4 The number of vehicle accidents per million kilometres driven.SOCIAL DATA2011201120102009Africa+Europe+Asia+Other+Number of employees*1,2079356696015041011Number of contractors* 3412972111941191513Number of expatriate employees1* 329247172260411810Number of locals1*1,219985708535582984Total workforce* 1,5481,23288079562311614Number of female employees* 41230721320620240Number of female managers*462422143200Number of managers*273--104148210+ This data is broken down by the location of the office or operation in which the employee or contractor works. The employee figures given in Section 2 of this report, for our Regional Business Units, refer only to permanent employees, exclude our Group function employees, but include those employees at Group locations working within the relevant Business Unit.* Indicates data reviewed by Deloitte as part of their assurance work. See page 80 for the independent assurance report.1 Includes employees and contractors.