International renewable energy development company GreenYellow is expanding its presence into South Africa, and provides not only proven renewable energy systems, but also technical advice and financing to catalyse the adoption of these energy sources by commercial and industrial companies, says GreenYellow South Africa sales director Michael Ilias. The company has signed an energy efficiency contract for 5 stores for a large retailer, and is working on a solar power purchase agreement multibuilding rollout for another large retailer.