"MONEY" the cost to buy solar power equipment and wind generators...and the other problem is where in durban would you get enough wind speed to power your house or even part of it for that matter...i have been looking into cost effective ways to power up homes and i am yet to find a way to do this...as i have heard people mention our biggest problem facing us in the future is not going to be fuel...its gona be "fresh drinkable water"