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Tables

4. Environmental implications of using or saving one kilowatt-hour of electricity1

      If electricity consumption is measured in:
  Factor 2    kWh MWh GWh TWh
Coal use 0,54      kilogram ton thousand tons (kt) million tons
Water use3, 4 1,40      litre kilolitre megalitre thousand megalitre
Ash produced 160      gram kilogram ton thousand tons (kt)
Particulate emissions4 0,22      gram kilogram ton thousand tons (kt)
CO2 emissions5 0,978 6    kilogram ton thousand tons (kt) million tons
SOx emissions5 8,463      gram kilogram ton thousand tons (kt)
NOx emissions5 4,210      gram kilogram ton thousand tons (kt)

Use of table: multiply electricity consumption or saving by the relevant factor to determine the environmental implication.

Example 1:

Used 90 kWh of electricity.
Water consumption: 90 x 1,40 = 126.
Therefore 126 litres of water used.

   
Example 2:

Used 90 GWh of electricity.
CO2 emissions 90 x 0,978 = 88,02.
Therefore 88,02 thousand tons emitted.

   

South African energy demand Eskom electricity generation mix Eskom research categories expressed as a percentage of total research cost

1. Figures are calculated based on total energy sold by Eskom. Further contact details can be obtained through the Eskom environmental helpline.
2. Figures represent the 12-month period from 1 April 2005 to 31 March 2006.
3. Volume of water consumed per unit of generated power sent out, excluding rain and mine water used.
4. Represents a 12-month moving average.
5. Calculated annual figures based on coal characteristics and power station design parameters.
6. Represents the Eskom average CO2 figure.The approved methodology should be followed to calculate the CDM emission factor.

 

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