NOVELTY - Converting waste from a content varying, heterogeneous waste stream into useable energy in a system which involves processing of the waste stream to produce a fuel and processing of the feedstock fuel to generate energy, comprises: monitoring the waste stream over time to develop a model of a composition of the waste stream with respect to at least one of time and source locations of the waste stream; and responsive to the step of monitoring, controlling e.g. (a) inputs into the waste stream, to optimize production of the useable energy.    USE - The method is useful for converting waste from a content varying, heterogeneous waste stream into useable energy in a system which involves processing of the waste stream to produce a fuel and processing of the feedstock fuel to generate energy.    ADVANTAGE - The method: is highly flexible; effectively and fully processes waste streams that vary in content and volume over time; and minimizes waste handling costs and/or facilities with waste collection, disposal, and/or energy operational concerns.    DETAILED DESCRIPTION - Converting waste from a content varying, heterogeneous waste stream into useable energy in a system which involves processing of the waste stream to produce a fuel and processing of the feedstock fuel to generate energy, comprises: monitoring the waste stream over time to develop a model of a composition of the waste stream with respect to at least one of time and source locations of the waste stream; and responsive to the step of monitoring, controlling at least one of (a) inputs into the waste stream, (b) a mixture of components of the waste stream used to produce the feedstock fuel, and (c) parameter values for processing the feedstock fuel to generate energy, to optimize production of the useable energy. An INDEPENDENT CLAIM is also included for an apparatus for use in the method of converting waste from a content varying, heterogeneous waste stream into useable energy, comprising: waste stream model storage for storing the information regarding a model of a composition of the waste stream with respect to at least one of time and source locations of the waste stream; and a controller for using the waste stream model information for controlling (a), (b) or (c).    DESCRIPTION OF DRAWING(S) - The figure illustrates a schematic representation of waste stream collection, processing and gasification system.    Variety of sources (702)    Box (706)    Processor (708)    Waste stream model (710)    Stream processing equipment (714)