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Tables

2. Eskom statistical overview

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              2006                2005  1           2004            2003              2002            2001              2000              1999              1998              1997         1996 
      (15 months)                                
Sales                                      
Total sold, GWh2 208 316    256 959    206 799  196 980  3 187 957  181 511  3  178 193  3  173 412  3  171 457  3  172 550  3  165 370 
Growth in GWh sales, %3 18,9  4 30,5    5,0  4,8    3,5  1,8    2,8    1,1    (0,6)    4,3    7,7 
Electricity output                                      
Total electricity for Eskom system                                      
(Eskom stations and purchased), GWh6 232 295    285 601     229 970  218 412    207 233  198 790    194 601    188 475    185 583    187 850    178 884 
Total produced by Eskom stations, GWh (net) 221 216    273 404    220 152  210 218    197 737  189 590    189 307    181 818    183 093    187 811    178 855 
Coal-fired stations, GWh (net) 205 837    251 914    202 171  194 046    181 651  175 223    172 362    165 665    165 473    170 464    163 541 
Hydroelectric stations, GWh (net) 1 141    903    720  777    2 357  2 061    1 343    726    1 596    2 092    1 319 
Pumped storage stations, GWh (net) 2 867    3 675    2 981  2 732    1 738  1 587    2 591    2 590    2 420    2 608    2 220 
Gas turbine stations, GWh (net) 78    –    –  –    –  –    1    –    3    –    – 
Nuclear power station, GWh (net) 11 293    16 912    14 280  12 663    11 991  10 719    13 010    12 837    13 601    12 647    11 775 
Total purchased for Eskom system, GWh 10 310    12 197    9 818  8 194    9 496  9 200    5 294    6 657    2 490    39    29 
Total consumed by Eskom, GWh7 3 814    5 043    4 040  3 664    2 354  2 177    3 478    3 507    3 299    3 511    3 130 
Total available for distribution, GWh2 228 480    280 557    225 929  214 748    204 879  196 613    191 123    184 968    182 284    184 339    175 754 
Plant performance indicators                                      
Total power station nominal capacity, MW 42 011    42 011    42 011  42 011    42 011  42 011    41 298    40 585    39 872    39 154    38 497 
Total power station net maximum capacity, MW8 39 810    39 810    39 810  39 810    39 810  39 810    39 186    38 517    37 848    37 175    36 563 
Peak demand on integrated Eskom system, MW 33 461    34 195    34 195  31 928    31 621  30 599    29 188    27 813    27 803    28 329    27 967 
Average energy availability – EAF (UCF), % 9, 10 87,4 (88,7)   89,5 (89,9) 11 89,5 (90,0) 87,5 (88,7)   89,3 (91,7) 92,0 (92,5   92,1 (92,8)   91,0 (92,5)   91,6 (92,7)   90,4 (91,5)   89,6 (90,6)
Generation load factor, %10, 12 69,7    69,0    69,2  66,3    62,3  59,8    60,6    61,2    61,6    65,0    63,9 
Integrated Eskom system load factor, % 79,8    78,0    77,4  76,8    74,0  73,4    74,7    75,9    74,8    74,3    71,5 
Environmental indicators                                      
Relative particulate emissions, kg/MWh sent out 0,21    0,26  11  0,27  0,28    0,29  0,31    0,35    0,37    0,36    0,44    0,63 
Specific water consumption, ℓ/kWh sent out13 1,32    1,27  11 1,26  1,29    1,27  1,26    1,21    1,25    1,23    1,20    1,21 
Reported legal contraventions counted in the operational                                      
sustainability index, number14 1    3  11 2   2    3  2    3    9    9    15    11 
Customer satisfaction (PreCare/MaxiCare), ratio –    8,29  11 8,31  8,47    8,57  8,43    8,82    8,78    8,90    9,10    8,72 
Customer satisfaction (Enhanced PreCare/MaxiCare), ratio15 101,06    93,10    –  –    –  –    –    –    –    –    – 
Net raw water consumption, Mℓ 291 516    347 135    277 557  271 940    251 611  239 233    228 759    227 288    225 280    225 699    216 131 
Coal burnt, kt 112 096    136 437    109 508  104 370    96 460  94 136    92 454    88 470    87 225    90 169    85 401 
Average calorific value, MJ/kg 19,58    19,36    19,42  19,41    19,54  19,42    19,50    19,53    19,84    19,68    19,83 
Average ash content, % 29,1    29,6    29,6  28,9    28,4  28,8    28,6    28,5    29,1    28,4    27,8 
Average sulphur content, % 0,88    0,87    0,87  0,92    0,92  0,93    0,90    0,96    0,93    0,94    0,97 
Overall thermal efficiency, % 33,8    34,0    34,0  34,2    34,1  34,1    34,4    34,4    34,2    34,5    34,5 
Line losses, % 8,2    8,2  11 7,8  8,3    8,2  7,2    7,4    6,2    5,9    6,4    5,9 
Nitrous oxide (N2O), t16 3 134    3 552    2 924  2 580    2 246  2 154    2 093    2 010    2 031    2 085    2 004 
Carbon dioxide (CO2), Mt16 203,7    247,0    197,7  190,1    175,2  169,3    161,2    159,4    163,2    169,0    158,6 
Sulphur dioxide (SO2), kt16 1 763    2 236    1 779  1 728    1 494  1 500    1 505    1 506    1 583    1 383    1 295 
Nitrogen oxide (NOx) as NO2, kt16 877    994    797  760    702  684    674    673    669    688    647 
Particulate emissions, kt 45,76    72,83    59,17  58,65    57,53  59,64    66,08    67,08    65,21    83,43    112,11 
Ash produced, Mt 33,4    40,8    33,1  29,8    26,2  26,5    24,6    24,3    24,7    23,7    22,2 
Ash sold, Mt 1,789    1,957    1,590  1,197    1,257  1,161    1,126    1,116    1,180    1,118    0,995 
Radiation release, mSv17 –    –    –  –    0,0005  0,0007    0,0005    0,0005    0,0007    0,0008    0,0008 
Radiation release, mSv18 0,0049    0,0079  11 0,0087  0,0123    0,0060  0,0192    0,0059    0,0112    0,0088    0,0122    0,0156 
Low-level waste – steel drums, cubic metres 91,3    282,5    258,8  86,9    89,04  117,25    72,80    70,77    61,18    89,95    109,06 
Intermediate-level waste – concrete drums, cubic metres 52,4    114,5    97,5  37,4    30,21  45,65    22,10    37,11    22,77    26,26    35,35 
Low-level nuclear waste – fuel racks, cubic metres 19 –    697    697  –    –  –    –    –    –    –    – 
Spent nuclear fuel, number of elements (cumulative figure)20 52 (1 505)   104 (1 453)   56 (1 405) 104 (1 349)   48 (1 245) 104 (1 197)   52 (1 093)   104 (1 041)   52 (937)   104 (885)   104 (781)
Employees                                      
Total number at year end22 29 697    29 845    28 396  28 938    29 359  29 969    32 832    34 027    37 311    39 241    39 857 
GWh sold per employee 7,015    8,854    7,283  6,807    6,402  6,054    5,427    5,096    4,595    4,397    4,149 
Sales to countries in southern Africa, GWh 13 122    16 008    12 954  10 173    6 956  6 710    3 872    3 884    4 093    6 439    5 554 
Botswana 1 727    2 111    1 699  1 390    1 124  1 183    986    934    689    748    685 
Mozambique 8 167    10 108    8 076  5 875    3 907  3 899    1 331    68    385    680    596 
Namibia 1 709    1 821    1 515  1 114    598  578    640    562    602    1 295    1 100 
Zimbabwe 549    598    532  793    298  371    788    1 564    1 521    2 790    2 267 
Lesotho23 23    13    12  38    16  40    12    55    209    318    335 
Swaziland 760    872    697  796    799  639    115    701    687    608    571 
Zambia24 187    465    403  151    103  –    –    –    –    –    – 
Short-term energy market25 –    20    20  16    111  –    –    –    –    –    – 



1.   Information represents a 15-month period, unless indicated otherwise.
2.   Difference between electricity available for distribution and electricity sold (includes internal usage) is due to transmission and other losses.
3.   Includes sales in respect of Department of Water Affairs and Forestry (DWAF) not stated in previous years.
4.   Actual sales growth was 0,8% when compared to the 12-month period 1 April 2004 to 31 March 2005.
5.   Own usage is not included in the calculation.
6.   Includes Eskom electricity produced and delivered to neighbouring countries.
7.   In respect of pumped storage facilities and synchronous condenser mode of operation. Refer to table 2, note 8, since 1993 energy consumption for water pumped for DWAF has been excluded from this total.
8.   Includes reserve stored and Transkei generators.
9.   Capacity hours available times 100 divided by total capacity hours in year.
10.   After excess capacity.
11.   Represents the 12-month moving average for 1 April 2004 to 31 March 2005.
12.   kWh produced times 100 divided by average net maximum capacity times hours in year.
13.   Volume of water consumed per unit of generated power sent out, excluding rain water used.
14.   2000 to 2002 are in terms of the revised definition of the operational sustainability index. Since 1998, other environment-related contraventions are also included. Prior to 1998, only water-related incidents were reported.
15.   The Enhanced MaxiCare replaced the PreCare/MaxiCare from January 2005. Reflects the environmental element of Enhanced MaxiCare.
16.   Calculated annual figures based on coal characteristics and power station design parameters.
17.   These indicators are provided for reference purposes. They are the radiation releases previously reported, based on the methodology stipulated by the National Nuclear Regulator prior to 2003.
18.   To ensure meaningful comparisons between years, indicators have been restated based on the new more conservative methodology approved by the National Nuclear Regulator for use from 1 January 2003.The limit set by the National Nuclear Regulator is ≤ 0,25mSv.
19.   Waste as a result of re-racking of spent fuel elements at Koeberg power station.
20.   Spent fuel means nuclear fuel that has been irradiated in, and permanently removed from, the reactor core.
21.   Correction made to the 2002 figure one element was under reported.
22.   Excludes employees of subsidiary companies.
23.   Lesotho started its own generation in 1999.
24.   Zambia included as from 2002.
25.   The short-term energy market consists of all the utilities in the southern African countries that form part of the Southern African Power Pool. Energy is traded on a daily, weekly and monthly basis as there is no long-term bilateral contract.

 

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