RETScreen a Free Clean Energy Project Analysis Application

I am attending the Tipperary Energy Agency training course on RETScreen

RETScreen is a tool used for PreFeasibility and Feasibility Analysis. It is developed by the Canadian government. It requires relatively little user input and calculates the technical and financial viability automatically. 

I would like to see RETScreen being used to estimate wind turbine and solar photovoltaic output and return on investment.