The team at Bright Energy designs, prototypes, and tests each concept in their Arvada, CO facility. Their Thermal Energy Storage (TES) systems offer long-duration storage at dramatically lower costs than other ES systems, with a 20-30 year useful lifetime, environmentally friendly materials, and no risk of fire at $50 to $75 per kW hour depending on application. In addition to their TES systems, Bright Energy Storage Technologies is developing an ultra-low-cost underwater energy storage system that compresses air and stores it in vessels at the bottom of a body of water, generating electricity when released back to the grid. This innovative technology yields dramatic reductions in the net cost and availability of grid-scale energy storage and can be deployed offshore, in lakes, and in many reservoirs. By storing air at hydrostatic pressure, in equilibrium with the surrounding water, the use of thin-walled storage vessels and simpler, more reliable compressors is possible. A simple, proprietary reversible air compressor runs at near-constant temperature and uses surrounding water as a heat sink and source, eliminating the need for fossil fuel.