The generation of electricity in solar thermal power plants is achieved through the turbine-alternator pair driven by superheated steam. In the case of parabolic trough technology (PTC), superheated steam can be produced either directly at the solar concentrator field (direct steam generation) or by transporting the heat transfer fluid to a solar steam generator or a recovery boiler. In this work, the parabolic trough collector has been subject to steady-state modeling considering different modes of thermal exchange. Once validated, this model was used to devise a solar field sizing protocol suitable for a hybrid power plant. Starting from the power block inlet mass flow rate corresponding to the power nominal design, it is feasible to determine the number of loops in the solar field. As an illustration, the suggested sizing protocol was implemented on an 80 MWe hybrid solar plant, presumed to operate under the Ghardaïa (Algerian Sahara) climatic conditions. The annual power plant performances and the solar field operating characteristic factors are estimated and discussed. As a result, it is important to mention that the electrical consumption of circulation pumps can represent as much as 10% of the nominal power of the installation. Finally, we can say that the developed codes (PTC and hydraulic codes) can, once combined, serve as simulation tools for sizing and performance assessment studies of the PTC solar field.