S1 TCM 2011-2 3rd October 2011

DSA TCM #2/201231st October 2012Cogeneration Power Plant Feasibility StudyS1 Power Management(PTTEP 0400/PIN.012/2012)

Progressive Development for the brighter opportunities 10/31/20121OutlinesBackground & ObjectiveElectrical Load ForecastTechnical AssumptionsCurrent PerformanceImprovementImport Power PEAOpen Cycle Gas TurbineCombined Cycle Gas TurbineDraft Plot Plan (Combined Cycle)Way ForwardSummary

Progressive Development for the brighter opportunities 10/31/20122Background and ObjectiveS1 oil production target of 30,000 BPD, 2012 -2016 requires substantial electrical consumption.

Sustainable, Economical, Environmental Friendly Technology Solution to maximize power generation capacity at S1.

Progressive Development for the brighter opportunities 10/31/20123Electrical Load ForecastProgressive Development for the brighter opportunities

11.21PresentFirm Load ForecastCurrent in-plant limitationAdditional Required PowerNon-Firm Load ForecastAvailable import power from grid 20 MW (maximum 45 MW.)10/31/20124TechnicalIn-plant capacity 23.7 MWEstimated additional power increase 12 MWExhaust gas from K-5804A used for Waste Heat Recovery Steam GenerationUtilizing K-5801A/B/C/D and K-5804B/C for Combined Cycle (Power Generation)

Progressive Development for the brighter opportunities 10/31/20125Current PerformanceProgressive Development for the brighter opportunities CENTAUR 50 x 4 units (K-5801A/B/C/D)

TAURUS 60 x 3 units (K-5804A/B/C)

2.8 MW (site condition)4 MW (site condition)Open Cycle Gas Turbine (OCGT) 7 units10/31/20126

OptionsProgressive Development for the brighter opportunities 10/31/20127CAPEXPAYBACKIRRNPVOption 1: PEA Power ImportedOption 2: Install 3 x TAURUS 60

Option 3: CCGT

Option 2: Install 3 new TAURUS 60 Gas TurbinesProgressive Development for the brighter opportunities

4-CENTAUR503-TAURUS 60(Total 23.7 MW)+ 3-TAURUS 60To gain more 12 MW output~70% of Input Heating Valueleft in Exhaust Gas!!OCGT efficiency ~ 30%Fuel GasAir InletElectricityExhaustGas+ Excess O2 ~ 15%10/31/20128Option 3: Upgrade to Combined Cycle Power PlantProgressive Development for the brighter opportunities

ExistingNew Upgrade4-CENTAUR 502-TAURUS 60Duct BurnersFuel GasCCGT efficiency ~ 50%12 MWMake-up water60 ton/hrMake-up water1 ton/hr10/31/20129Main EquipmentHeat Recovery Steam GeneratorSteam Turbine GeneratorCondenserDeaeratorCooling Tower

Economiser1st Superheater2nd SuperheaterGT Exhaust525 deg CStack

180 deg CRisersRisersDownComerHeat Recovery Steam Generator (HRSG) Steam/Water CIRCUITSTGDeaeratorDesuperheater10/31/201210Progressive Development for the brighter opportunities 10Draft Plot Plan Combined Cycle10/31/2012Progressive Development for the brighter opportunities 11

Way ForwardProgressive Development for the brighter opportunities ImprovementProsConsFor Additional Power 12 MWInstallation of newGTGs

1. Fast track2. Simple operationFuel gas utilization & efficiencyFuel gas consumptionRetrofit of existingGTGs to CCGT

1. Increase efficiency2. Green Technology.3. Minimal fuel gas consumption1. High CAPEX;2. Complexity3. More space requirement;

Other ImprovementsUpgrade existing GTs Gain Approx 1.7 MWAlternators also need to be upgraded.Fuel gas supply slightly increaseAir Inlet Cooling1.Gain Approx 4.5 MW2. High CAPEX.10/31/201212SummaryTechnically, to achieve 12 MW additional power demands, all three options are feasible;Option 1: Power Import from PEAOption 2: Install 3 x TAURUS 60Option 3: CCGTCCGT converted to Cogeneration when heat from steam consumption increases. CCGT utilizes energy effectively as compared with OCGT so it supports TAGNOC.Progressive Development for the brighter opportunities 10/31/20121313