The carbon emission reduction being achieved by Chinese coal combusted electricity generation are critical for global sustainable development and environmental protection. In this paper, to achieve carbon emission reduction and reliable electricity generation, an equilibrium strategy based on a hydro-wind-thermal complementary system under an uncertain environment that fully considers the cooperation of hydro power plants, wind power plants, and coal combusted thermal power plants is proposed as an optimization method. By considering the randomness of seasonal wind speeds, the water flow uncertainty and the fuzziness of coal thermal plant carbon emissions, the complementary model is more scientific and practical than current models. A case study from Bijie City is presented to demonstrate the practicality and efficiency of the optimization model. The results from 12 different wind speed and water flow level scenarios showed that the complementary system provides a superior method to solving the conflicts between carbon emission reduction and reliable electricity generation and therefore could be of great assistance to system operators when scheduling generation.