NOVELTY - Cogeneration system (I) comprises: an internal combustion engine (111); an electrical generator (115) powered by the combustion engine to provide electrical power external to (I); an excess thermal energy system adapted to extract thermal energy produced by the internal combustion engine to provide excess thermal energy external to (I); and a fuel-warming system adapted to extract thermal energy from engine combustion products to provide thermal energy to heat waste-recovered fuel within (I) so that water within the heated waste-recovered fuel is vaporized and separated from the fuel.    USE - (I) is useful to receive and prepare raw fuel-laden waste for combustion in the engine where the fuel-laden waste has not been pre-filtered or pre-treated to remove particulates or water, where the fuel-laden waste comprises: vegetable oil, preferably fat or hydrogenated oil that has been utilized in food preparation; a petroleum product or a synthetic product that has been utilized in a machine application of engine lubrication, transmission lubrication, hydraulic power transmission, hydraulic lines, power steering or machine cutting; virgin vegetable oil, virgin lard, virgin hydrogenated oil, biodiesel and/or petroleum diesel; and propane, natural gas, hydrogen, carbon monoxide and/or methane (all claimed). (I) is useful for recapturing energy from certain waste products containing hydrocarbons in various forms.    ADVANTAGE - (I) provides: efficient, reliable, easy-to-operate, economically feasible, small-scale production of electrical power; automated processing and use of untreated and unfiltered fuel-laden waste, in liquid, semi-liquid, and/or solid form, for electricity generation; and excess thermal energy for general heating purposes, e.g. heating domestic hot water or air. (I) can remove large and small particulates and water from the fuel-laden waste.    DESCRIPTION OF DRAWING(S) - The figure shows a block-diagram representation of a waste-water cogeneration system.    Internal combustion engine (111)    Waste-recovered-fuel intake tank (112)    Secondary tank (113)    Generator (115)    Electrical power interconnect device (116)