Independent producers are already feeding enough electricity into the national grid to replace two coalfired power stations. Unshore wind and solar power feature strongly in South Africa's renewable energy mix due to be contracted from independent producers by the end of September 2022 under the government's rolling procurement programme. The fifth bid window of the Renewable Energy Independent Power Producer Procurement Programme iREIPPPP} aims to secure a total of 2,583MW of renewable energy, of which \"LIEUSMW will come from onshore wind farms and 925MW from solar photovoltaic plants. A total of 25 projects have been selected for development, and a wind and solar company called Mainstream Renewable Power succeeded in securing 12 of them. This makes Mainstream the most successful company in the history of the South African renewable energy procurement programme, with more than 2.1GW {gigawattsj awarded to it to date. "These are completely new projects, and so they haven't built anything,\" said Wikus Kruger, research lead of power sector investment at Power Futures Lab, a centre of expertise based at the University of Cape Town's Graduate School of Business. "They are supposed to reach the financial close deadline at the end of September. \"That is a deadline for the banks and the other investors to be satisfied with all the contracts in place. Once the risks have been dealt with, then they provide the first tranche of money for the project to start construction," Kruger explained. The chosen projects are expected to start generating electricity by the earliest in April 2024. Together they will produce an estimated 4,5[10 Gigawatt hours (GWhJ of green electricity each year, helping to avoid nearly five million tonnes of CD2 per annum once fully operational. "They will provide South Africa with critical, lowcost, indigenous power and help deliver a just transition towards its clean energy and climate goals," says the Department of Mineral Resources and Energy [DMRE] in a statement on its website. From the above scenario, describe and explain the procurement model used by the Department of minerals and Energy to secure bidders. Discussthe impact of the selected procurement model on the project. [9+821?' marks]