Solid fuel is the third kind of Fuel besides wood and coal and is processed in a Chemical plant. There are three recipes to choose from, each one to create it from Heavy Oil, Light Oil or Petroleum Gas. One piece of Solid fuel has a fuel value of 25MJ (compared to 8MJ of one piece of coal).
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When to use solid fuel
Actually hard to say and depends much on the map. Generally if a map is rich of coal but poor on oil it is a bad choice to create solid fuel. With 25MJ solid fuel has more then three times the fuel value of coal, but there is only the need of mining drills to get coal while there has to be build Pumpjacks, Oil refinerys and Chemical plants for creating solid fuel and maybe cracking oil.
Which recipe to use
- Light Oil has actually nearly no use ingame and has the best oil to solid fuel ratio which makes it the best choice.
- Heavy Oil is mainly used for Lubricant which isn't needed in huge amounts, but cause of the bad oil to solid fuel ratio it shouldn't be used direct to create solid fuel. Cracking it to light oil will loose 25% of heavy oil but will still result in a better oil to solid fuel ratio when creating it out of the cracked light oil.