Brown Boveri Strasse 7 Megawatt Park, Maxwell Drive, 5401 BADEN, Switzerland Sunninghill, Sandton, www.power.alstom.com www.eskom.co.za MEDUPI STEAM POWER PLANT 6 x 794 MW The Giant of South Africa The Medupi fired power plant is the biggest thermal power plant ever ordered by South African utility, , and will be the first baseload power Medupi Steam Power Plant Generators Feedwater heating plant plant to be built in the country in 20 years. Eskom awarded the contract for the Power plant installed capacity 6 x 794 MW Type GIGATOP 2 poles turbine island of the six supercritical units to Alstom, who will also build a Feedwater heaters 6 (3 LP + deaerator +2x2 HP) repeat plant, known as Kusile. Operating mode Base load Rating 940 MVA Feedwater deaerating tank yes - stork type Medupi is a 6 x 794 MW supercritical coal fired power plant located next to the Maximum ambient temperature 40°C Power factor 0,9 Feedwater temperature 267°C 6 15 km west of , in the province of Frequency 50 Hz South Africa. Terminal voltage 22 kV Main pumps The turbine island scope for which Alstom is responsible includes the turnkey Steam turbines Excitation system Static supply of the turbine island, comprising the steel structure and equipment Cooling system Water & Hydrogen Condensate extraction pumps 1x100% fixed speed + 1x100% variable speed motor inside, and the air-cooled condensers (ACCs), which provide cooling for the Type STF100 plant. In addition to delivering the turbine-generator and associated auxiliaries Number of modules 4 (1HP + 1IP + 2 LP lateral exhaust) Feedwater pumps 3 x 50% variable speed - hydraulic coupling systems, Alstom will provide the turbine control and protection systems. Alstom Condensing plant is responsible for LP turbine bypass valves, the turbine hall cranes, valves, piping Steam pressure 241 bars / 50,5 bars and local instrumentation, turbine hall ventilation and fire protection. Alstom Steam temperature - Inlet / Reheat 560°C / 570°C Condenser pressure 141 mbar at 23,7°C air temperature also has electrical scope covering the busbars, generator circuit breaker, Speed 3000 rpm Tubes material carbon steel generator current transformers and generator transformer protection.

Key A Boiler B Turbine hall C Transformer D Air-cooled condenser D E Chimney 7

11 A C 8 E B 3

10 9

1 2 Key 1 STF100 Steam Turbine 4 2 GIGATOP Turbogenerator 3 Feedwater tank MEDUPI 4 HP heaters 5 KUSILE 5 Bus duct 6 Air-cooled condenser 7 Condensate tank 8 Steam ducts 9 LP bypass valves Progressive House, 2 Maidstone Road Foots Cray, Sidcup, Kent, DA14 5HZ, 10 600 m3 condensate water reserve tank United Kingdom 11 Condensate Polishing Plant Tel: +44 (0)208 269 7766 www.modernpowersystems.com