 The CFO of Brazilian renewable energy firm Renova Energia SA resigned and a key shareholder gave up its stake after failed talks to sell heavily indebted wind farm projects. Renova Chief Executive Officer Cristiano Corrêa de Barros will temporarily assume the responsibilities of outgoing Chief Financial Officer Claudio Ribeiro, the company said on Monday. Separately on Monday, Renova shareholder Light SA said it had sold its 17.17 stake in the firm to an investment fund for a symbolic value of 1 real. 