In the current push to convert to renewable sources of energy, many issues raised years ago on the economics and the difficulties of siting energy storage are once again being raised today. When large amounts of wind, solar, and other renewable energy sources are added to existing electrical grids, efficient and manageable energy storage becomes a

Introduction to and Motivation for Energy Storage. Pumped Hydro. Underground Pumped Hydro. Compressed Air. Electro-chemical, Batteries. Grid Storage, Power Wheeling. Thermal Storage for Solar Thermal. Hydrogen. High Power, Low Energy Storage Systems.