2013/14 2012/13
2011/12
2010/11
2009/10
2008/09
2007/08
2006/07
2005/06
2004/05
(15 months)
2004
(12 months)
 
Sales                        
Total sold, GWh1 217 903 216 561 224 785 224 446 218 591 214 850 224 366 218 120 207 921 256 453 206 799  
Growth/(reduction) in GWh sales, % 0.6 (3.7) 0.2 2.7 1.7 (4.2) 2.9 4.9 (18.9)2 30.5 5.0  
Electricity output                        
Power sent out by Eskom stations, GWh (net) 231 129 232 749 237 289 237 430 232 812 228 944 239 109 232 445 221 988 273 404 220 152  
Coal-fired stations, GWh (net) 209 483 214 807 218 210 220 219 215 940 211 941 222 908 215 211 206 606 251 914 202 171  
Hydroelectric stations, GWh (net) 1 036 1 077 1 904 1 960 1 274 1 082 751 2 443 1 141 903 720  
Pumped storage stations, GWh (net) 2 881 3 006 2 962 2 953 2 742 2 772 2 979 2 947 2 867 3 675 2 981  
Gas turbine stations, GWh (net) 3 621 1 904 709 197 49 143 1 153 62 78  
Wind energy, GWh (net) 2 1 2 2 1 2 1 2 3  
Nuclear power station, GWh (net) 14 106 11 954 13 502 12 099 12 806 13 004 11 317 11 780 11 293 16 912 14 280  
Purchased from IPPs, GWh 3 671 3 516 4 107 1 833  
Wheeling, GWh3 3 353 2 948 3 099 3 423 3 175  
Total imported for Eskom system, GWh3 9 425 7 698 9 939 10 190 10 579 12 189 11 510 11 483 10 310 12 197 9 818  
Total electricity available for distribution (generated by Eskom and purchased), GWh 247 578 246 911 254 434 252 876 246 566 241 133 250 619 243 928 232 298 285 601 229 970  
Total consumed by Eskom, GWh4 3 862 4 037 3 982 3 962 3 695 3 816 4 136 3 937 3 814 5 043 4 040  
Total available for distribution, GWh5 243 716 242 874 250 452 248 914 242 871 237 317 246 483 239 991 228 484 280 558 225 930  

1. Difference between electricity available for distribution and electricity sold is due to transmission and other losses.
2. Actual sales growth was 0.8% when compared to the 12 months 1 April 2004 to 31 March 2005.
3. Prior to 2009/10, wheeling was combined with the total imported for the Eskom system.
4. Used by Eskom for pumped-storage facilities and synchronous condenser mode of operation.
5. Includes Eskom electricity delivered to neighbouring countries.

  2013/14 2012/13
2011/12
2010/11
2009/10
2008/09
2007/08
2006/07
2005/06
2004/05
(15 months)
2004
(12 months)
Plant performance indicators                      
Total power station installed capacity, MW 44 189 44 206 44 115 44 145 44 175 44 193 43 037 42 618 42 011 42 011 42 011
Total power station nominal capacity, MW 41 995 41 919 41 647 41 194 40 870 40 506 38 747 37 764 36 398 36 208 36 208
Peak demand on integrated Eskom system, MW 34 977 35 525 36 212 36 664 35 850 35 959 36 513 34 807 33 461 34 195 34 195
Peak demand on integrated Eskom system, including load reductions and non-Eskom generation, MW   36 345 37 065 36 970 35 912 36 227 37 158 35 441 33 461 34 195 34 195
Average energy availability – EAF (UCF), %1,2 75.1 (76.9) 77.7 (78.8) 82.0 (83.0) 84.6 (85.9) 85.2(85.9) 85.3(86.1) 84.8(86.2) 87.5(88.6) 87.4(88.7) 89.5(89.9)8 89.5(90.0)
Generation load factor, %3 62.8 63.6 65.1 66.4 66.2 67.0 72.3 72.4 69.7 69.0 69.2
Integrated Eskom system load factor (EUF), % 83.6 81.9 79.4 78.5 77.7 78.6 85.2 82.7 79.8 78.0 77.4
Environmental indicators                      
Specific water consumption, L/kWh sent out4 1.35 1.42 1.34 1.35 1.34 1.35 1.32 1.35 1.32 1.278 1.26
Net raw water consumption, ML 317 052 334 275 319 772 327 252 316 202 323 190 322 666 313 064 291 516 347 135 277 557
Environmental legal contraventions 32 485 50 63 55 114 46 50 55 57 44
Significant legal contraventions reported, number6 2 27 5 4 12 6 1 38 2
Liquid fuels (diesel and kerosene), ML 1 148.5 609.7 225.5 63.6 16.1 28.9 345.9 11.3
Coal burnt, Mt 122.4 123.0 125.2 124.7 122.7 121.2 125.3 119.1 112.1 136.4 109.6
Average calorific value, MJ/kg 19.77 19.76 19.61 19.45 19.22 19.10 18.51 19.06 19.58 19.36 19.42
Average ash content, % 28.56 28.69 28.88 29.03 29.56 29.70 29.09 29.70 29.10 29.60 29.60
Average sulphur content, % 0.87 0.88 0.79 0.78 0.81 0.83 0.87 0.86 0.88 0.87 0.87
Overall thermal efficiency, % 31.3 32.0 31.4 32.6 33.1 33.4 33.4 33.9 33.8 34.0 34.0

1. EAF measures plant availability including planned and unplanned unavailability and energy losses not under plant management control.
2. UCF measures plant availability including planned and unplanned outages.
3. kWh produced, times 100, divided by average net maximum capacity times hours in a year.
4. Volume of water consumed per unit of generated power sent out by commissioned power stations.
5. An additional legal contravention was declared against Group Capital after finalisation of the integrated report thus increasing the 2012/13 year total to 48.
6. Reported in terms of the 2002 definition of the operational health dashboard. From 2008, repeat legal contraventions are included in the criteria.
7. Increased from previously reported figure (1) due to an additional legal contravention which was identified during the year for activities associated with the underground coal gasification (UCG) pilot plant, allocated to the time of identification in October 2012.
8. Represents the 12-month moving average for 1 April 2004 to 31 March 2005.

  2013/14 2012/13
2011/12
2010/11
2009/10
2008/09
2007/08
2006/07
2005/06
2004/05
(15 months)
2004
(12 months)
Environmental indicators                      
Total energy losses, % 8.9 9.1 8.7 8.3 8.5 7.9 8.0 8.4 8.2 8.26 7.8
Nitrous oxide (N2O), t1 2 969 2 980 2 967 2 906 2 825 2 801 2 872 2 730 3 134 3 552 2 924
Carbon dioxide (CO2), Mt1 233.3 227.9 231.9 230.3 224.7 221.7 223.6 208.9 203.7 247.0 197.7
Sulphur dioxide (SO2), kt1 1 975 1 843 1 849 1 810 1 856 1 874 1 950 1 876 1 763 2 236 1 779
Nitrogen oxide (NOx) as NO2 kt2 954 965 977 977 959 957 984 930 877 994 797
Relative particulate emissions, kg/MWh sent out1 0.35 0.35 0.31 0.33 0.39 0.27 0.21 0.20 0.21 0.266 0.27
Particulate emissions, kt 78.92 80.68 72.42 75.84 88.27 55.64 50.84 46.08 45.76 72.83 59.17
Ash produced, Mt 34.97 35.30 36.21 36.22 36.01 36.66 36.04 34.16 33.40 40.80 33.10
Ash sold, Mt 2.4 2.4 2.3 2.0 2.0 2.1 2.4 2.2 1.8 2.0 1.6
Asbestos disposed, tons 458.0 374.6 448.1 611.5 321.4 3 590.8 321.0 6 060.0
Material containing polychlorinated biphenyls thermally destructed, tons 10.4 0.93 14.3 422.9 19.1 505.6 17.0 10.0
Public individual radiation exposure due to effluents, mSv4 0.0012 0.0019 0.0024 0.0043 0.0040 0.0045 0.0047 0.0034 0.0049 0.00796 0.0087
Low-level radioactive waste disposed of, cubic metres 324.0 54.0 53.8 81.0 216.0 189.0 270.0 135.0 91.0
Intermediate-level radioactive waste disposed of, cubic metres 178.0 0 128.0 0 266.0 473.6 418.0 436.0 52.0
Used nuclear fuel, number of elements discharged (cumulative figure)5 48 (2 061) 56 (2 013) 60 (1 957) 112 (1 897) 56 (1 785) 56 (1 729) 112 (1 673) 56 (1 561) 52 (1 505) 104 (1 453) 56 (1 405)

1. Calculated figures based on coal characteristics and power station design parameters. Sulphur-dioxide and carbon-dioxide emissions are based on coal analysis and using coal burnt tonnages.
Figures include coal-fired and gas turbine power stations, as well as oil consumed during power station start-ups and, for carbon-dioxide emissions, the underground coal gasification pilot plant.
2. NOx reported as NO2 is calculated using average station-specific emission factors (which are measured intermittently) and tonnages of coal burnt.
3. In 2012/13, the polychlorinated biphenyls thermally destructed figure was incorrectly stated as litres instead of tons and this has been corrected 1 048 litres = 0.93 tons.
4. The limit set by the National Nuclear Regulator is ≤0,25mSv.
5. The gross mass of a nuclear fuel element is approximately 670kg, with UO2 mass, typically between 462kg and 464kg.
6. Represents the 12-month moving average for 1 April 2004 to 31 March 2005.