Some semi-recent fantastic news: Cape Town is allowing commercial, industrial and residential users to feed electricity back into the grid! I may be wrong, but I think this is a South African first. Small scale embedded electricity generators (SSEG) can now apply for compensation of electricity fed back into the Cape Town grid, if they meet the conditions stipulated in the Guidelines for Embedded Generators.
Some of the conditions are that the generators may not be net generators of electricity (are only selling their excess electricity), install the necessary equipment for grid feedback at their own cost, apply for a generation license from NERSA for a generation capacity greater than 1MVA (no license for less than 1MVA capacity needed) and only sell back to the City of Cape Town grid and agree to the SSEG tariffs.
This is one of the ways the City of Cape Town wishes to achieve its goal of sourcing 10% of its electricity from renewable energy sources by 2020.