This study examines the investment costs of over 50 large-scale TES systems, including aquifer thermal energy storage (ATES), borehole thermal energy storage (BTES), pit thermal energy storage (PTES), and tank thermal energy storage (TTES) systems, based on desk. This study examines the investment costs of over 50 large-scale TES systems, including aquifer thermal energy storage (ATES), borehole thermal energy storage (BTES), pit thermal energy storage (PTES), and tank thermal energy storage (TTES) systems, based on desk. DOE's Energy Storage Grand Challenge supports detailed cost and performance analysis for a variety of energy storage technologies to accelerate their development and deployment The U. Department of Energy's (DOE) Energy Storage Grand Challenge is a comprehensive program that seeks to accelerate. This report is available at no cost from the National Renewable Energy Laboratory (NREL) at www. Cole, Wesley and Akash Karmakar. Cost Projections for Utility-Scale Battery Storage: 2023 Update. Comparing the costs of rapidly maturing energy storage technologies poses a challenge for customers purchasing these systems. There is a need for a trusted benchmark price that has a well understood and internally consistent methodology so comparing the different technology options across different. To evaluate the technical, economic, and operational feasibility of implementing energy storage systems while assessing their lifecycle costs.