** Shares in Brazilian power company Auren Energia AURE3.SA fall sharply following its fourth quarter results

** Auren posted a net loss of 363.6 million reais ($62.86 million) for the period, down from a 220.2 million real-profit a year earlier

** Executives say Auren has been capturing synergies after the 2024 acquisition of the Brazilian operations of AES Corp

** The company in 2025 will move forward with plans to build the Cajuina 3 wind power complex, they add

** Citi analysts say that while Auren presented higher-than-expected synergy gains from the AES deal in the fourth quarter, they weren't enough to offset poor results

** "Curtailment and generation remain a concern, alongside a still stretched balance sheet, especially under a still uncertain macro scenario," Citi says

** Auren's shares slip more than 6.5%, the biggest faller on Brazil's benchmark stock index Bovespa .BVSP, which is up 0.5%

** Year-to-date, Auren is down roughly 7%

** Auren is controlled by Brazilian conglomerate Votorantim and Canada's CPP Investments

($1 = 5.7844 reais)

(Reporting by Gabriel Araujo and Leticia Fucuchima)

((Gabriel.Araujo2@thomsonreuters.com; +55 11 5047-3352;))