These gateways support the integration of diverse types of energy storage solutions, such as batteries, pumped hydroelectric systems, and compressed air energy storage. Wire gauge must meet local codes and in some circumstances wire gauge requirements change based on distance. *Total length of communications cable, including. San Diego Gas & Electric has committed to one of the largest energy storage projects ever built – a 250 MW facility constructed entirely of lithium-ion battery systems (BESS's) to provide grid stabilization services and “peaker” capacity within SDG&E's transmission network. It has 250 MW of power and a storage capacity of 250 MWh (1 hour), using lithium-ion battery cells from LG Chem. The purpose of the battery is to provide power during.