All submissions have biases and do NOT consider/evaluate what is best for the local economy.
They ignore the IEP largely and that SA's highest energy cost is for transport, not for electricity. 
The IRP route (central planning) is highly unlikely to give maximum economic benefit - competition by the market is a far better approach -with taxes/costs for externalities, such as GHG emissions, water use, imports, etc .
MESSAGE :  GO BACK TO DRAWING BOARD to create right model parameters.