NOVELTY - Making (M1) solid fuel from brown grease involves providing brown grease; dewatering the brown grease; and combining the dewatered brown grease with a combustible material to make the solid fuel.    USE - For making solid fuel from brown grease; for generating energy from brown grease; for making a fertilizer material such as class A biosolid fertilizer from sewage sludge (all claimed); in generation of foodstuff for agriculture field.    ADVANTAGE - The method is safe, simple and cost-effective; produces revenue-generating products to reduce or eliminate the cost of collection, removal, and disposal; prevents contamination of fresh water supplies; reduces the spread of harmful biological contaminates; and effectively produces the solid fuel with high yield.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) a solid fuel comprising brown grease and at least one combustible material combined with the brown grease;    (2) generating (M2) energy from brown grease involving dewatering brown grease and combusting the dewatered brown grease to generate energy;    (3) a system (8) (S1) for making solid fuel from brown grease comprising a dewatering unit (20) capable of dewatering brown grease and a mixing unit (24) capable of combining dewatered brown grease with a combustible material to make a solid fuel from dewatered brown grease;    (4) making (M3) a fertilizer material from sewage sludge involving providing sewage sludge, providing steam generated by combusting a fuel comprising brown grease, and contacting the sewage sludge with the steam to dewater the sewage sludge and render a fertilizer material;    (5) a system (S2) for making fertilizer material from sewage sludge, comprising the system (S1), a solid fuel boiler capable of combusting solid fuel from the system for making solid fuel to generate steam, and a steam dryer for dewatering sewage sludge. The steam dryer is coupled to the solid fuel boiler. The steam from the solid fuel boiler contacts the steam dryer, thus dewatering sewage sludge contained in the steam dryer to render a fertilizer material.    DESCRIPTION OF DRAWING(S) - The figure shows a system for making solid fuel from brown grease.    system (8)    process vat (14)    dewatering unit (20)    mixing unit (24)    control system (30)    sensor. (40)