| C.H.P. | Combined Heat and Power production. |
| co-generation | synergistic generation of multiple types of energy, i.e. heat and electricity in order to achieve optimum fuel energy content conversion. I.e. very high efficiencies. |
| crude | Being in an unrefined or natural state; raw, archaic. A substance, especially petroleum, in its unrefined state.
Manure is a crude that can be refined into highly valuable fertilizer by anaerobic digestion. - byproduct is a hydrocarbon fuel: methane.
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