Renewable energy, such as solar, wind, or hydro, is derived from natural processes where the replacement rate is faster than the consumption rate. In Ecuador, hydropower is the predominant source of renewable energy, but its intermittency is largely driven by climate variability, including climate teleconnections like the El Niño Southern Oscillation (ENSO). Previous studies have primarily focused on detecting climate teleconnections using data from sparse weather stations, neglecting the spatial and seasonal influences of these teleconnections. This study identifies climate teleconnections that are spatially and seasonally related to rainfall in three hydropower basins of Ecuador: Jubones, Paute, and Napo. Twelve climate indices from the Pacific and Atlantic Oceans were correlated with monthly CHIRPS satellite rainfall estimates (1981–2019). The results showed a predominant influence from the Pacific Ocean in all three basins, with most indices being positively correlated with ENSO. In Jubones, most indices showed positive teleconnections in the April-May-June (AMJ) season, and both positive and negative teleconnections in the July-August-September (JAS) season. Similarly, in Paute, positive teleconnections were observed in AMJ and JAS, while negative teleconnections were noted in January-February-March (JFM) and JAS. In Napo, positive influences were observed in JAS, while negative influences were observed throughout the year. This study provides valuable insights for the future development of monitoring and prediction systems for hydropower generation.