JOHANNESBURG--May 7, 2012--Written by Richard Finlayson, Senior International Editor for Industrial Info Resources (Sugar Land, Texas)--Maintenance procedures and programs for renewable and sustainable power technology projects are becoming a growth area, as those technologies vie to be the most energy-efficient, investment-positive and reliable. In this sector, developing economies are showing dramatic growth in the number of installations under construction or far down the project planning pipeline. Other companies featured: Siemens AG (NYSE:SI) , Abengoa S.A. (OTC:ABGOF)