A supply pump actuating turbine, in particular for a power plant, that includes at least two jet sectors for introducing a working gas into the turbine, a line system for connecting the at least two jet sectors to at least two different sources of working gas, and a valve arrangement for setting the supply of the jet sectors with the working gas from at least one of the sources. The valve arrangement and the line system are designed in such a way that at least three operating states can be set: a first operating state, in which all the jet sectors are supplied with the working gas of the first source, a second operating state, in which all the jet sectors are supplied with the working gas of the second source, and a third operating state, in which at least one of the jet sectors is supplied with the working gas of the first source and at least one other of the jet sectors is supplied with the working gas of the second source.