Q. How can I find information about the design of photovolataic (solar) power plants?
Use OneSearch to find some general information about power plants, government publications, non-governmental information (California Energy Commission).
Search using the databases Compendex, and Environmental Sciences and Pollution Abstracts.
Finally, browse the reference shelves (i.e. on the first floor of the library) for handbooks - such as Marks Standard Handbook for Mechanical Engineers.