This table relates to the relative energy costs in Johannesburg, South Africa
Table reflects costs at March 2023 just before 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=R18.16; EURO 1= R19.69 : UK Pnds 1= R22.39

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	-	-	R2.28/kwh	R2.28	Based on 500-1000kwh monthly tariff Prepaid Johannesburg March 2023
Hot water	-	-	2.3 kwh	-	Energy needed to heat 100 litres for 20 degree increase
LPG gas (9kg bottle)	49.6	26	R300	R2.41	9 kg bottle contains equivalent of 124 kwH of electricity
Petrol	45.8	33.7	R22.50/litre	R2.51	This assumes there can be 100% energy conversion. A generator usually is only 30% efficient. Eskom quoted in Mar23 that costs after conversion by generation on large scale is R7.80 per kwH
Diesel	45.5	36.9	R24.45/litre	R2.79	This assumes there can be 100% energy conversion. A generator usually is only 30% efficient. Eskom quoted in Mar23 that costs after conversion by generation on large scale is R7.80 per kwH
Municipal Gas (Egoli gas)	-	-	R140.30/GJ	R2.16	Plus R87 per month connection charge
Parraffin	46	38.8	R20.87/litre	R2.38	Used for heating and cooking
Coal	24	-	R2.91/kg	R1.00	-
Anthracite	33	-	R290 per 40kg	R1.15	-
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	-	-	-