Two new concentrating solar power (CSP) plants have been announced by the Department of Energy, to be built in the Northern Cape.
Kathu Solar Park and Redstone Solar Thermal Power, which will both build 100MW capacity, were the preferred bidders in the third round of the government’s Renewable Energy Independent Power Producer Procurement Programme (REIPPPP), the department said.
Concentrated solar thermal power is able to store solar power generated during daylight hours. The two plants will add to the five already commissioned in the hot, dry province, including one belonging to Eskom.
A consortium led by GDF SUEZ, and comprising the Sishen Iron Ore Company Community Development Trust, Investec Bank, Lereko Metier and Public Investment Corporation, is backing the Kathu Solar Park.
It will incorporate parabolic trough technology and will be equipped with a molten-salt storage system that will allow 4.5 hours of thermal energy storage.
The consortium behind the Redstone Solar Thermal Power project is led by SolarReserve, a global developer of utility-scale solar power projects and advanced solar thermal technology, and International Company for Water and Power Projects (ACWA Power), the Saudi water and power developer, owner and operator.
SolarReserve said the project, which had the lowest tariff bid to date from any CSP project in the country, was scheduled to achieve financial close later in 2015 and begin operations in early 2018.
The first of its kind in Africa, Redstone would use molten salt energy storage technology in a tower configuration able to support South Africa’s demand for energy when it was needed most – day and night, said the company.
“The 100 MW project with 12 hours of full-load energy storage will be able to reliably deliver a stable electricity supply to more than 200 000 South African homes during peak demand periods, even well after the sun has set.
“Fuelled completely by the sun, with no back up fuel required, the project also features dry cooling of the power generation cycle as an important element to minimize water use.”
SolarReserve chief executive Kevin Smith added: “Due to the fully integrated thermal energy storage, the plant will provide dispatchable power on-demand, just like conventional coal, oil, nuclear or natural gas-fired power plants, but without the harmful emissions or hazardous materials and without any fuel cost.”
The project technology will be based on SolarReserve’s successful Crescent Dunes project in the US, which is complete with construction and currently in final commissioning.
Local economy benefits
Paddy Padmanathan, head of ACWA Power said: “All aspects of the project, from development phase to construction and then operations, have been structured to ensure maximisation of value retention in not just the South African economy, but also within the local economy of Northern Cape.”
Redstone will be built in Postmasburg, adjacent to the 75MW Lesedi and 96MW Jasper photovoltaic (PV) solar power projects, developed by SolarReserve and its partners. Together, the three comprise the world’s first combined CSP and PV solar park, with a total of 271MW of generating capacity.
Redstone would create more than 800 direct jobs during the construction phase, as well as significant additional jobs related to equipment supply, manufacturing, engineering, transportation and other services, said SolarReserve. Over 40% of the total project value would be provided by South African suppliers, a portion of which would support black economic empowerment activities.
REIPPPP going forward
In December 2014, Energy Minister Tina Joemat-Pettersson said that a new determination for an additional 3 600MW in the REIPPPP would be announced. It would include an additional 200MW for the small renewable IPP procurement programme.
A funding mechanism to support small- and medium-sized South African enterprises to participate in the latter would be established in the first quarter of 2015 in collaboration with the Development Bank of Southern Africa. It would enable the broadening of the local market and create black entrepreneurs in the energy space.
In addition to naming Kathu and Redstone the latest preferred bidders, the department and electricity supplier Eskom concluded power purchase, implementation and direct agreements for the 100MW Xina and the 100MW Karoshoek Solar One projects, the preferred bidders in programme’s third bid window.
ACWA Power is already building the 50 MW Bokpoort CSP project. Active CSP projects already under way by independent power producers in Northern Cape are:
- Abengoa, of Spain, is building three projects – the 50 MW Khi Solar One power- tower project, the 100 MW KaXu Solar One project and the Xina project; and,
- Karoshoek Solar One is being developed by a consortium comprising Emvelo, the Industrial Development Corporation, ACS Cobra Energia, Public Investment Corporation, Investec and the Karoshoek Community Trust.
Eskom is also pursuing its own CSP project near Upington.
Previous rounds of the REIPPPP have been a success, with 21 renewable projects, which will provide 1 076MW, connected to the grid.
The programme is seen as important for closing the power gap, with energy supply in South Africa highly constrained.