(Adds context, analyst report)
By Tatiana Bautzer and Gabriela Mello
SAO PAULO, Oct 14 (Reuters) - 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.
The exits of Light and Ribeiro follow years of unsuccessful talks to sell Renova's wind farm projects, which have racked up debt and raised concerns about their timely completion.
Negotiations to sell the projects to AES Tiete Energia SA , a subsidiary of AES Corp, broke down last week after six months of discussions.
Renova has been trying to sell some of its wind projects for more than two years. Before AES, the company was in talks with Canada's Brookfield Asset Management Inc, which ended with no agreement in July 2018.
BTG Pactual analysts said "construction related risks" seemed to be the reason for AES Tiete to walk away from the deal, citing meetings with executives.
The result is negative for Light and state-controlled power holding company Companhia Energetica de Minas Gerais (Cemig), said the analysts led by BTG Pactual's Joao Pimentel in a note to clients written before Light sold its stake.
Cemig had a debt exposure of 768 million reais ($186 million) to Renova. Light had 253 million reais. Analysts say that if no other buyer shows up, the only solution would be for Cemig and Light to step up and finish the projects.
But Light has signaled the intention of not taking over with the sale of the stake to a fund.
The projects owe 960 million reais ($233 million) to state development bank BNDES, analysts said.
($1 = 4.12 reais) (Reporting by Gabriela Mello and Tatiana Bautzer; editing by Brad Haynes, David Evans and David Gregorio)