Robben Island has a solar energy microgrid that was designed by SOLA Future Energy. The system, situated on the World Heritage Site, consists of a solar PV farm, combined with a lithium-ion battery storage facility and smart controllers to ensure a seamless electricity supply, while significantly reducing the island’s fossil fuel consumption.
Robben Island has an energy usage profile that comprises residential needs, desalination, harbour and offices; in total, the island uses almost 2M kWh of electricity annually.
Commissioned by the Department of Tourism, the solar PV project will produce almost 1M kWh of electricity annually, significantly reducing costs of buying diesel and transporting it to the island. The island is also embarking on a drive to reduce its own electrical consumption.
The island is a world heritage site and a very sensitive area to carry out construction. Environmental and historical considerations meant that the site for the PV farm was carefully chosen. SOLA staff had to also be sent for training to handle penguins, snakes and wildlife as well as archaeological artifacts that might be discovered underground.
The microgrid consists of three power production elements. The solar PV farm consists of 1960 mono-crystalline modules with a total of 666.4 kW power supply. The battery bank, consisting of 2420 lithium-ion battery cells, is able to store 837 kWh and output a maximum of 500 kVA.
The third power production element is the diesel generators, which are used when no solar or battery storage is available.
Multiple controllers between these power production elements balances the power supply and creates a smart microgrid, ensuring a seamless supply of power.
“The microgrid on Robben Island is the largest combined solar and lithium-ion storage microgrid system in South Africa,” said Dom Wills, CEO of SOLA Future Energy.
“For Robben Island, the solar microgrid will reduce its fossil fuel consumption by 235 000 litres of diesel per annum or 50% of previous usage. This will result in a reduction theIsland’s carbon emissions by at least 820 tons, and will save the island money during its 25 years of operation.
"The island’s microgrid is also a very good example of how non-electrically connected Africa will be powered in the next 20 years,” he added.