Cost of annual energy consume

 Cost of hydrocarbons industrially produced domestically and distribute from fossil carbons.   

(1) C + H2O = CO + H2 - 176   KJ, 

(2) 0.5 C + H2O = H2 + 0.5 CO2 - 90 KJ, 

(3) CO + 2 H2 =CH2 + H2O + 226 KJ. 

and totally, 

1.5 C + H2O = CH2 + 0.5 CO2 - 40 KJ. 

Supposing USD 12O /  ton C,   

1.5 * 12 * 120 -+ 40 *4 / 3.6 = 2160 + 44 = 2200 / 14 = USD 157 / ton CH2.  Adding 100% for Capex, cost of hydrocarbons production with a good reserve would be about USD 300 / ton CH2.  

Annual energy consumption for USA = 1.5 milliard toe (ton of oil equivalent) * USD 300 = 450 milliard dollar, at GDP 28 trillion dollar, or 1.6% of GDP satisfy annual energy consume. Correspondingly  for European Union  with 1.2 millliard toe at 29 trillion dollar GDP PPP, it is 1.25 % from GDP PPP.