Inter Press Service: Renewable energy sources enjoy excellent prospects in Spain, but there are complaints about business practices in the energy sector and the lack of effective enforcement of environmental standards. Several companies have announced huge investments in clean energy. Among the foremost are Iberdrola, which is to invest 8.6 billion euros (12.2 billion dollars) in renewable energy, including wind power, from 2008 to 2010, and Abengoa, which is investing two billion euros (2.8 billion …