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To help compare different orders of magnitude we list here energies between 1021 joules and 1022 joules. Weaker energies 3.6 × 1021 J -- 1,000,000 TWh 6.0 × 1021 J -- energy in world's estimated natural gas reserves (2003) 6.2 × 1021J -- total energy from the Sun that hits the Earth in one hour 7.4 × 1021 J -- energy in world's estimated petroleum reserves (2003) Stronger energies External link Conversion Calculator for Units of ENERGY (http://www.ex.ac.uk/cimt/dictunit/ccenrgy.htm)