 I'm involved in Africa Energy Future Project to try and come up with a regional hydro-economic model for Africa. So I'm on the water resources engine. So I'm developing this water resources model that will be eventually integrated with an energy model and an economic model and trying to look at what impact of climate change will be to hydropower and what that means in the long run for the economy. It's important because while climate change becoming a major threat these days, we need to really know what its impact is going to be on the water resources and what that means or how that translates into hydropower generation and what that means to generate to the energy system for a region or for a country. So it's important in that respect. Wind and solar energy resources are clean, have no too very little carbon emission. So they have played a central role in combating climate change mainly by replacing fossil fuels also together with a growing demand for a growing demand in energy. Many countries globally are actively engaged in developing their resources but there's a certain level of challenge that comes with developing these resources especially when we come to implementation because mainly these resources are particularly wind and solar intermittent in nature and the reliability by themselves is very low. So they need some sort of backup system or some complementary energy resource to make them more usable. One of the effective ways of making this wind and solar power more usable is by operating them together with hydropower which serves as a battery or a backup system. Therefore the method that I presented yesterday was try and come up with an optimized way of operating the reservoirs in such a way that this synergetic benefit can be obtained from the wind and hydropower. So the findings were that we were able to get more reliability by operating them together. So in the South African context South Africa is known for having a huge potential for wind and solar. On the other hand there's no significant storage for hydropower but there's an opportunity in Zambezi River basin due to the huge storage that exists right now. So this research was looking at if this coordinated operation between South Africa wind and hydropower in Zambezi could give rise to a better penetration of this wind resource in the energy system.