Concluding a Skype call with Sir Magdi Yacoub – the world renowned cardio surgeon, we knew that this was going to be one of the most pleasant and meaningful assignments of our working career. As part of its inspired vision, the Magdi Yacoub Foundation has overseen the establishment of the New Aswan Heart Centre – a centre of excellence to combat heart disease in Egypt. The extension of the hospital would ideally be completely “green”, that is powered only by renewable energy. To that end, Sir Magdi asked us to develop a business plan for the development of a solar farm in the adjacent area of the hospital. Teaming up with solar energy experts, we developed an advanced economic modelling tool that can run different investment scenarios – based on the exact location and associated solar radiation potential, the use of different technologies (PVs or CSPs), and the expected consumption.