Flexible perovskite solar cells (FPSCs) have emerged as promising renewable energy technologies for powering self-sustaining systems. By combining the high efficiency of perovskite materials with the flexibility of lightweight substrates, FPSCs offer a versatile solution for solar energy harvesting. This review delves into advancements in FPSC technology, highlighting key components, fabrication techniques, and performance improvements. Integrating FPSCs with flexible energy storage devices such as supercapacitors and batteries is crucial for realizing self-powered systems. This review discusses the challenges and opportunities associated with this integration, including power management, durability, and scalability. Although significant progress has been made, challenges such as long-term stability, hysteresis, and scalability remain. Addressing these challenges is essential for commercializing FPSCs and their widespread adoption in self-powering applications. Moreover, the environmental impacts of FPSCs, including material sourcing, manufacturing processes, and end-of-life considerations, must be carefully evaluated. By addressing these challenges and considering their environmental impact, FPSCs have the potential to revolutionize the field of renewable energy and contribute to a sustainable future. This review provides a comprehensive overview of the current state-of-the-art and future perspectives for FPSCs, with the aim of stimulating further research and development in this exciting field. Specifically, future research should focus on improving the long-term stability of FPSCs, developing low-cost and scalable fabrication techniques, and optimizing the integration of FPSCs with energy storage devices. By addressing these key issues, FPSCs can become a practical and sustainable solution for powering a wide range of devices and applications.