Half-green fiels production.

 (1) 0.5 C + 0.5 CO2 = CO - 86 KJ

  (2,) C

 + H20 = CO + H2 -  

173 KJ

3) CO +H2O = H2 + CO2 - 3 KJ - negligible. (4) CO + 2H2 = CH2 (hydrocarbons)  + H2O + 250 KJ. Materials' balance: for a mol CH2 are consumed 1.5 mol C, and exhausted 0.5 CO2 mol , and a mol CO is sold. If C being USD 120/ton, CO is sold by USD 50/ ton or much more expensive, and CO2 being 1144 kwh/ton by (USD 0.004 /kwh - see Preamble) = USD 4.5, Opex, so totally CH2 = (1.5 * 1 2 * 120 - 28 * 50 + 44 * 4.5) = 2160 - 1400 + 200 = 960. Energy balance: (86 + 173) * 4 / 3.6 - 250,000 * 0.3 efficiency heat in electricity * 0.033 local tariffs / 3.6 = 300 - 700 = - USD 400. And  CH2 = (960 - 400) = USD 460 / 14 = USD 33/ ton CH2 = USD 4.6/bbl.

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