Energy equivalents

Also see an article on Grid-tie inverters and solar geysers
Also see an article on Battery technologies

This table relates to the relative energy costs in Johannesburg, South Africa
Table reflects costs at August 2015 just after the annual increases in electricity pricing.
Different countries have different tax structures on energy technologies and so expect different results for outside South Africa.
Approximate exchange rates - US$1=R12.50; EURO 1= R14.00 : UK Pnds 1= R19.50

To convert Mega Joules to kwH 

   KwH=MJoules/3.6      OR  watt Hours = Joules/(3600)          (number of seconds in 1 hour)
 

Technology Energy value
MegaJoules/kg
Energy value
MegaJoules/litre
Cost
South African Rands
Equivalent cost/kwh
South African Rands
Notes
Electricity  -  - R1.47/kwh R1.47 Based on 500-1000kwh monthly tariff
Prepaid Johannesburg July 2015
Hot water  -  - 2.3 kwh - Energy needed to heat 100 litres for 20 degree increase
LPG gas (9kg bottle) 49.6 26 R200 R1.61 9 kg bottle contains equivalent of 124 kwH of electricity
Petrol 45.8 33.7 R13.72/litre R1.45 This assumes there can be 100% energy conversion. A generator usually is only 25% efficient
Diesel 45.5 36.9 R11.71/litre R1.14 This assumes there can be 100% energy conversion. A generator usually is only 30% efficient
Municipal Gas (Egoli gas) - - R263.30/GJ R0.94 Plus R87 per month connection charge
Parraffin 46 38.8 R7.86/litre R0.72 Used for heating and cooking
Coal 24 - R160 per 70kg R0.34 -
Anthracite 33 - R180 per 70kg R0.28 -
Residential heating oil 46.2 37.3 - - -
Ethanol 29.746 38.8 - - -
Methane 55.5 - - - -
Hydrogen 141 5.6 - - -
Jet Fuel (Kerosene) 46 37.4 - - -
Wood 16.2 13 - - -

Also see an article on Grid-tie inverters and solar geysers
Also see an article on Battery technologies

31 July 2015


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