TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: (I) further comprises one or more of: (h) a trace contaminant removal unit (single or a first and a second) between the first and second heat exchanger units and a single acid gas remover unit to remove portion of trace contaminants (e.g. carbonyl sulfide (COS), mercury (Hg) and hydrogen cyanide (HCN)) from the single cooled first gas stream, or the first and second cooled first gas streams; (i) a reformer unit (single or a first and second unit) to convert a portion of the single methane product stream into a syngas; (j) a single methane compressor unit to compress a portion of the single methane product stream, or first and second methane product streams; (k) a carbon dioxide recovery unit to separate and recover carbon dioxide removed by the single acid gas remover unit, or the first and second acid gas remover units; (l) a sulfur recovery unit to extract and recover sulfur from the hydrogen sulfide removed by the single acid gas remover unit, or the first and second acid gas remover units; (m) a catalyst recovery unit (single or a first and a second) to extract and recover a portion of the entrained catalyst from a portion of the solid char product from the first and second gasifying reactor units, and recycle portion of the recovered catalyst to the catalyst loading unit (single or first and second); (n) a gas recycle loop to recycle portion of the single methane-depleted gas stream, or when present, a portion of one or more of the first and second methane depleted gas streams, to one or both of the first and second gasifying reactor units; (o) a waste water treatment unit to treat waste water generated by the system; (p) a superheater to superheat the steam in or from the steam source (single or the first and/or second); (q) a steam turbine to generate electricity from a portion of the steam supplied by the steam source (single or the first and/or second); and (r) a sour shift unit (single) between the first and second heat exchangers and a single acid gas remover unit, to contact cooled first gas stream with an aqueous medium to convert a portion of carbon monoxide in the first and second cooled first gas stream to carbon dioxide and a trim methanator between an acid gas remover unit and a methane removal unit.