The Nexus Platform is enabled by

Bundesministerium für wirtschaftliche Zusammenarbeit und Entwicklung
This project is co-funded by the European Union
The Republic of South Africa

News  |  29 Nov 2013

Case study // The Republic of South Africa

South Africa is still not fully electrified - the gouvernement just had to push this target to 2025. At the same time, the country is among the "Top 10" with the worst Carbon footprints in the world. This case study analyses, whether Concentrated Solar Power (CSP) and woody bio mass help both generating more energy and reducing the countries Carbon emissions


We consider here two options for generating electricity with alternative primary energy sources that can potentially replace fossil energy sources:

- Concentrated Solar Power (CSP): power tower systems similar to the one considered for the 50 MW Bokpoort CSP power plant in South Africa under the UN's CDM programme (UNFCC 2012-TR). For this scenario, we used technical data referring to the similar 20MW Gemasolar plant in Spain with molten salt storage and wet cooling (Torresol Energy 2011) and spatial data from the Centre for Renewable and Sustainable Energy Studies (CRSES) of Stellenbosch University.

- Woody biomass for electricity production: dry woodchips production from forestry residue in South Africa. For this scenario, we used technical data from the literature (Torresol Energy 2011; Larrain and Escobar 2012 (CSP); Pimentel et al. 2002; Buhholz et al. 2012) and spatial data from the Centre for Renewable and Sustainable Energy Studies (CRSES) of Stellenbosch University.

The EROI value ranges of the hypercycle for the two alternative primary energy sources are: 12-20:1 for CSP and 7-11:1 for woody biomass for electricity. Thus, both alternatives have a significantly lower EROI of the hypercycle compared to the present electricity production in South Africa (46:1). Hence, a significant deployment of these two alternative primary energy sources would reduce the overall strength of the South African exosomatic hypercycle (SEH) in relation to electricity production. As a consequence, a larger share of the production factors available to South Africa would have to be invested in generating electricity (since the requirement of production factors per unit of energy carrier supplied is larger than the average of the hypercycle allocated to the production of electricity) rather than using them for producing and consuming goods and services.


Multi-Scale Integrated Assessment of Society and Ecosystem Metabolism (MuSIASEM) ; biomass ; biomass resources ; food security ; fossil fuels ; non-renewable energy resouces ; rural electrification ; water-energy-food security nexus ; Deutsche Gesellschaft für Internationale Zusammenarbeit GmbH (GIZ) ; United Nations Food and Agriculture Organization (FAO) ; ; South Africa

› back

News  |  , Jobs  |  15 Sep 2017

Job Vacancy // Water resource planning consultant for a multi-purpose dam in the Cochabamba Departamental Administration, Bolivia

The Nexus project in Bolivia aims at introducing a coordination mechanism of the three sectors of water, energy and food security in order to mitigate resource scarcity caused by climate change and to take advantage of synergies....› more

News  |  14 Sep 2017

Green Economy // The WEF Nexus and Green Growth

By Robert C. Brears. In a green economy – an economy that values and enhances natural capital while simultaneously promoting economic growth and human well-being – the management of the water-energy-food nexus means fostering...› more

News  |  13 Sep 2017

Call for Submissions // Nexus 2018: Water, Food, Energy and Climate

For the 2nd Chapel Hill Nexus Conference, taking place on 16-18 Apr 2018, researchers, policy makers and practitioners are invited to submit their papers. Deadline is 31 Oct 2017.› more