Retrofitting of public buildings through green technologies and processes (RE-FIT) As sustainable energy (SE) measures in buildings are still not fully implemented in Lebanon, with a high energy consumption and substantial economic and environmental costs, it is proposed to upgrade public and non-operational renewable energy installations and equipment (e.g. photovoltaic (PV) panels and PV lead batteries ) in public buildings through the set-up of new financially viable repair and recycling processes.