1. Prestedge Retief Dresner Wijnberg NGQURA POWER PROJECT COOLING WATER SYSTEMS Intake and Outfall Considerations

2. Prestedge Retief Dresner Wijnberg INTAKE & DISCHARGE CONCEPTS Typical intake pumphouse footprint Typical surface outfall

3. Prestedge Retief Dresner Wijnberg TYPICAL INTAKE PUMPHOUSE CONCEPT 4 DUTY PUMPS (PLUS 1 STANDBY) 7 m 3 /s EACH Typical Cross-section Typical Plan View

4. Prestedge Retief Dresner Wijnberg

5. TYPICAL MULTI-PORT DIFFUSER DISCHARGE CONCEPT Multi-port Diffuser with 15 x 0.6m diam Discharge Ports 3 x 2.0m diam Outfall Pipes (Plus 1 Standby)

6. Prestedge Retief Dresner Wijnberg CCGT CONCEPT, COOLING SYSTEM ALTERNATIVES & WATER QUALITY GUIDELINES STEAM CYCLE COOLING TECHNOLOGY DIRECT SEA WATER COOLING SYSTEM EVAPORATIVE CLOSED COOLING SYSTEM 100,000 m 3 10 o C – 12 o C Sodium Hypochloride (NaOCl) 0.1 mg/l (max) - 4,000m 3 (make up water) 2,600m 3 (purge discharge) 10 o C Above make up water. 5 o C Above ambient air temp. Sodium Hypochloride (NaOCl) 0.1 mg/l (max) 1.5 Times original seawater (i.e. 1.5 x 35,000 mg/l = 52,500 mg/l). FLOW RATE: TEMP RISE: ANTI-FOULING AGENT: CHLORINE RESIDUAL: BRINE CONC. FACTOR: vs

7. Prestedge Retief Dresner Wijnberg Water Quality Guidelines SA WATER QUALITY GUIDELINES WORLD BANK GUIDELINES FOR NEW THERMAL POWER PLANTS INTERNATIONAL TARGET VALUES FOR NATURAL MARINE ENVIRONMENT ZONE OF IMPACT KEPT TO A MINIMUM; DETERMINED THROUGH EIA 100m FROM POINT OF DISCHARGE (ASSUMING NO SENSITIVE ECO- SYSTEMS PRESENT) - TEMPERATURE INCREASE AT EDGE OF ZONE +/- 1 DEGREE C LESS THAN OR EQUAL TO 3 DEGREES C LESS THAN 2 DEGREES C (AUSTRALIA) RESIDUAL CHLORINE LEVEL AT EDGE OF ZONE 0.2mg/l AT DISCHARGE I.e. PRIOR TO DILUTION 7.5  g/l (4d ave); 13  g/l (1h ave); NOT TO BE EXCEEDED MORE THAN ONCE EVERY 3 YR SALINITY CHANGE < 5% FROM BACKGROUND

8. Prestedge Retief Dresner Wijnberg INTAKE & DISCHARGE CONSIDERATIONS

9. Prestedge Retief Dresner Wijnberg

10. AMJ 2Q06 JAS 3Q06 OND 4Q06 JFM 1Q07 A AMJ 2Q07 JAS 3Q07 OND 4Q07 JFM 1Q08 MJ 2Q08 JAS 3Q08 OND 4Q08 JFM 1Q09 Sea Water Cooling* & EIA Linkages ToR Data Collection Concept & Prelim Design Detail Design RfP Select Mobilise & Construct – 24 months 2009/10 ONDJFM Scoping SpecialistToR EIR EMP ROD Appeal Bid Documentation EIA design and schedule risk Brainstorm solutions Preferred Option