mass flow element 6 the second mass flow element 6 is supplied to the steam turbine 2 in the first turbine stage 9 the first mass flow element 5 is supplied to the steam turbine 2 in a turbine stage 10 which follows the first turbine stage in the second operating mode 8 the first mass flow element 5 can therefore largely be made usable in the steam turbine 2 fig3 shows a conventional steam power station having a process steam consumer as is known from the prior art the figure shows a steam turbine 2 which comprises a high pressure turbine 16 a medium pressure turbine 15 and two low pressure turbines 14 as well as a process steam consumer 3 and a condenser 17 a steam line 22 is connected to an outlet of the medium pressure turbine 15 and is split at a splitting point into a process steam line 19 and an overflow line 20 the process steam line 19 is connected to a supply line to the process steam consumer 3 a control valve 23 is connected in the process steam line 19 the overflow line is connected to the inlets of the low pressure turbines 14 a throttle valve 18 is connected in the overflow line.