Slough Multifuel Extension Project. The extension of a multifuel combined heat and power (CHP) electricity generating station from up to 50 megawatts (MW) gross output to up to 60 MW gross output, comprising the following engineering operations: installation of primary and secondary air preheating systems to the boilers to increase the thermal efficiency of the generating station, including heat exchanger bundles, pipework, valves, pipe supports, thermal insulation, instrumentation, cabling and containment; mechanical modifications to the steam turbine inlet control valve to increase the steam capacity and to the turbine control system and distributed control system software to allow for an increase in the gross output of the generating station; and associated development.