Key Technologies and Development Paths of Gravity Energy Storage in Large Scale Development of Renewable Energy Bases

China vigorously promotes constructing large-capacity of wind and photovoltaic bases with a focus on deserts/gobi areas, improving the local climate and environment, preventing wind and fixing sand, and improving soil. As a method of mechanical storage, gravity energy storage essentially involves the mutual conversion of gravitational potential energy and electrical energy. We have studied the current development status, technical bottlenecks, and economic evaluation. The results show that it has a lifespan of up to 40 years, and its full life cycle electricity cost is about 60% of electrochemical energy storage, and its operational performance is not affected by factors such as humidity and temperature. It is particularly suitable for large-scale development and construction in renewable energy bases, it has outstanding advantages such as intrinsic safety, long operating life, short construction period, excellent stability, full SOC operation, no upstream raw material restrictions, flexible and adjustable energy storage duration, and cross seasonal energy storage regulation potential, which has good economic and social benefits.