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CSP can store energy which compliments other renewable energy sources such as wind and photovoltaic systems (PV). Data from Stellenbosch University’s Centre for Renewable and Sustainable Energy Studies shows that the Northern Cape province has Direct Normal Solar Irradiation of between 3 000kWh/m2 and three 200kWh/m2, the highest in the country, making it ideal for solar power installations. The Karoshoek Solar One project is the fifth CSP installation in the province. 

The parabolic trough technology operates by tracking the sun using several parabolic mirrors that focus the sun’s rays onto an absorber pipe which holds a fluid. This fluid, which is synthetic heat transfer oil, transfers the captured solar energy to the water within the steam generator, where the energy is used to convert water into steam which in turn is used to drive the turbo generator. 

Unlike a conventional solar photovoltaic (PV) system, the Ilanga 1 Project is based on Concentrated Solar Plant (CSP) technology. Solar PV facilitates and converts sunlight directly into electricity, whereas CSP facilitates and converts sunlight into thermal energy, which is then turned into electricity by a turbo generator.  

The Ilanga-1 CSP plant has a molten salt storage system which allows for 4,5 hours of thermal energy storage to help reduce the effects of irregular sunlight. This enables the Ilanga 1 Project to generate electricity in the evening without solar radiation.  

The Ilanga 1 Project will help alleviate the pressure on the national grid and subsequently reduce load shedding.  

From a clean energy perspective, CSPs do not require coal to produce electricity. They also do not produce any waste associated with coal or nuclear power plants. As a result, these types of plants are economical and environmentally friendly; there are no fuel costs or harmful emissions. The project has also created multiple job opportunities in the Upington region. 

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