Julian, there are several parameters to consider. Most of them will be set by the desired purpose of the turbine (electricity production, driving motors, process steam). These can include,
I suggest you to take a look over the the websites of the manufacturer and eye the turbine catalogs. "Next Generation KA24/GT24: Technical paper - Alstom".
2) Type of the turbine like Back Pressure Controlled Extraction,Back Pressure Un-controlled Extraction,Straight Backpressure,Controlled Extraction Condensing,Straight Condensing with bleed and ,Straight Condensing
First of all, thank you very much for your comments. Second, I'm sorry for my delay, something is happening with the internet service at my home. I posted my comments a couple days ago but it seems nothing happened. Then, I made the question because my country has some projects about power generation. In spite of a large part of electricity generated here is by hydroelectricity power stations, the government scarcely invest in renewable energies. Only 1.1% of power generation here is by means renewable sources. Therefore, I am trying to have a vision and compare this project which is called Hydrosogamoso with a solar panel project and thermal power station. In the case of my question, I needed further information about the thermal station. The solar project is easy to compare but I am gathering more information. Thanks again for helping to me all of you.