The crop is grown on 60ha near Marble Hall in Limpopo, but the ultimate objective is to expand growing through southern Africa and build up to sufficient volumes to justify building a refinery.
Until then, the oil extracted from solaris seeds is being exported to AltAir Fuels in the US, where it is refined and sent back to South Africa as blended biojet fuel.
SAA acting chief executive Musa Zwane said the target was for half of the airline's aircraft to use biojet fuel by 2023. SAA's environmental specialist, Ian Cruickshank, said about 97% of the airline's carbon emissions resulted from flying and only 3% from operations, so it had no alternative but to invest in more environmentally friendly fuel.
Project Solaris is targeting 20-million litres of biojet fuel by the end of next year and 500-million litres by 2023, which is half the annual fuel requirement of SAA's Johannesburg hub.
Cruickshank said the benefits of Project Solaris went beyond reducing SAA's carbon emissions.