Off-Shore Wind Energy: Operation, Maintenance and Economics.- Maintenance methods in wind turbines.- Diagnosis and Maintenance methods in solar power plants.- The main factors to consider in a feasibility analysis for the development and operation of a biogas plant.- Using LCA technique to improve the operation and maintenance of green energy plants.- Grid integration of renewable generation.- Control methods applied in renewable energy systems.- Low cost hybrid systems of renewable energy.- Renewable energies in the context of the electrical markets.- Photovoltaic solar energy based sizing tool for railway level crossing electrical systems.- Use of renewable energy systems in Smart Cities.- Analysis of the impact on the integration of RES generation associated to the increased share of electric vehicles.