Constant mixed messages from Eskom (pushing for nuclear and dragging their feet with renewable energy) but at least some R&D is progressing on grid storage which is needed to smooth out use of renewable energy on the grid.
While renewable energy independent power producers (IPPs) are in the dark about when new power purchase agreements (PPAs) will be signed, Eskom has established a battery test and demonstration facility at its Research and Innovation Centre in Rosherville, the only one of its kind in SA.
The power utility says the objective of this facility is to compare different technologies and supplier products under identical South African conditions and to identify which of these products is suitable for Eskom’s future needs for energy storage.
“We have identified the need for up to 2 000MW of additional, daily balanced energy storage within the existing grid,” says Barry MacColl, Eskom’s general manager for research testing and development.
See http://www.itweb.co.za/index.php?option=com_content&view=article&id=162478&A=GIT&S=Green%20IT&O=E&E=3-11329 
Eskom sets sights on renewable energy storage | ITWeb
Eskom sets sights on renewable energy storage | ITWeb