A pumping apparatus for a water treatment plant, the pumping apparatus comprising a gas supply, at least one gas turbine 11 connected to the gas supply, the at least one gas turbine connected to drive at least one primary pump 12 through a reduction gear train 13 and clutch 14, a waste heat boiler 26 having a feed water input, the waste heat boiler having an exhaust gas input 26a to receive exhaust gas from the at least one gas turbine 11 and generate steam from the feed water, the waste heat boiler having an steam output 18, the apparatus further comprising at least one steam turbine 20, the at least one steam turbine connected to drive at least one secondary pump 21, the at least one steam turbine being connected to the steam output 18 of the waste heat boiler, the at least one steam turbine 20 further having an exhaust steam output 27, the apparatus further comprising a condensing apparatus 28 to receive steam from the exhaust steam output and generate a feed water stream at a feed water output, the feed water outlet being connected to the feed water input of the waste heat boiler 26.