Global Grid Energy Storage Market By Type (Pumped Hydroelectric Storage System, Thermal Storage, Battery Storage, Compressed Air Energy Storage, Flywheel Storage, and Molten Salt Storage), By Application (Mechanical Energy, Chemical Energy, Electrochemical Energy, Thermal Energy, and Electromagnetic Energy), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2019-2028