In South Africa for example, only 50% of the planned new generation capacity was covered by outside tendering, and the remaining 50% was reserved to Eskom. As much as possible however, the SOE should compete with private investors on the same grounds and criteria of evaluation. Moreover if preferential treatment is given to the SOE or to a particular class of actors during tendering, it should be justified as clearly in the public interest rigorously defined and clearly explained to the bidders.