Thanks for the link Cap, been working like a pig this year and been out of touch with recent developments. That article is from the Jan 2008. The edition I read was much later and it basically concluded that all alternative energy source worked out more expensive than fossil fuel.
This is true if you go the commercial root. You will have to do this stuff yourself or buy all the materials and employ a semi-skilled craftsman to make it. Anybody that can weld, build houses, fix cars would be able to assemble the designs. Patents is another issue, the
http://www.stirlingengine.com/ecommerce/product.tcl?product_id=84 and
http://www.solarfire.org/tech/helios/helios.html are not patented. A farmer for example can place multiple Sterling engines in parallel powering them with Helios mirrors. If builds the system himself it would be viable given Eskom's rate hikes. For residential households generating hot water is also easy, many patents on the idea though.
http://homepower.com provides resources for building your own fridge using ammonium and parabolic mirrors etc.
The solution to South Africa's problem is setting up solar farms with
http://www.solarfire.org/tech/helios/helios.html to power turbines where water is available or Stirling engines. These distributed power generating networks feeds their power back into the Eskom grid , especially farms would be viable for this.
It is a matter of jacking up the cost of Eskom power to where the construction costs meet.
Another issue is the following: Eskom needs to maintain extensive power grids to farms over huge distances, but farmers can't pay R10000 / month more to water their crops, they will start going over to parabolic mirrors and Stirling engines or turbines. The unit area you need to power a 10Kwatt motor is 20x20m or 4% of a hectar - a very small space. This assumes a 15% efficient parabolic trough system. With Lonnie Johnson's 60% system the costs would come down considerably. We just have to hack the patent and copy his design once it becomes commercial. Such a motor running during the blazing sun can pump water for 6 hectar bananas saving R3000/month on Eskom. Eskom could totally drive farmers of the grid as they only need to pump when the sun shines BUT Eskom would still need to maintain the power lines! Thus where will they get revenue to maintain it? The ANC and Eskom is lying to us, nobody knows what is really going on at Eskom.