Evaluating the Most Commercially Viable Energy Storage Technologies

Abstract: As the global energy sector shifts toward low-carbon systems, energy storage becomes essential for ensuring reliability, flexibility, and long-term sustainability. This study evaluates sixteen energy storage technologies, grouped into four categories: gravity-based, kinetic, electrochemical, and chemical. To assess commercial viability, each technology is examined using a consistent set of seven criteria: Technology Readiness Level (TRL), Life Cycle Assessment (LCA), GreenScore, Geopolitical Score, Depreciation, Cost per Energy ($/Energy), and Cost per Unit ($/Unit). These factors reflect a combination of technical maturity, environmental impact, strategic risk, and economic practicality. Scores were assigned based on published data and comparative analysis, with weights applied to emphasize criteria most relevant to large-scale deployment. Radar plots illustrate the relative strengths of each technology within its category, while a final heatmap offers an overview across all groups. The results confirm the continued market strength of pumped hydro and lithium-ion batteries, largely due to their high readiness levels and low unit costs. However, technologies such as liquid air and ammonia-based systems show promise in areas like sustainability and geopolitical stability. By integrating environmental, technical, and economic dimensions into a unified framework, this study offers a method for comparing a wide range of storage solutions. The findings are intended to inform energy planning, investment decisions, and policy development at a time when scalable and resilient energy storage is more critical than ever. As demand for clean power rises, the diversification and strategic deployment of storage technologies will remain essential to the success of the global energy transition.