With the expansion of cloud computing, ensuring fault tolerance while optimizing energy consumption has become paramount. This paper conducts a comprehensive review of energy-efficient fault tolerance (FT) techniques in cloud computing environments. By analyzing various strategies, mechanisms, and algorithms, this paper aims to provide insights into the state-of-the-art approaches for achieving fault tolerance while minimizing energy consumption. The comparative analysis includes an examination of different FT techniques based on their energy efficiency, reliability, scalability, overhead, and applicability in cloud computing environments. The findings contribute to the understanding of energy-efficient FT techniques and offer guidance for researchers and practitioners in selecting suitable approaches for their specific cloud computing requirements.