Hi Ignacio,
The inputs on the Electricity Rates page should be general enough that you can use them for electricity rates in different countries. The Utility Rate Database (URDB) does not have data for Spain, so you will have to interpret the rate data provided by the electricity service provider and enter the data into SAM by hand.
Be careful that the currency units are consistent for the electricity rates, installation costs, operating costs, incentives and financial costs. Because the default costs are in U.S. dollars, it may be best to convert your currency values to dollars to ensure that all costs are consistent.
As for other NREL software, see the NREL Data and Tools website at
www.nrel.gov/research/data-tools.html
Best regards,
Paul.