Energy management systems (EMS) are software platforms that monitor and optimize electrical grids and facilities. They integrate data from thousands of sensors (power plants, substations, solar panels, batteries, homes), analyze that data in real-time, and make/recommend decisions to keep the grid balanced. A typical EMS flow: solar forecast predicts 2GW generation at noon. EMS anticipates demand at that time. 30 minutes before, EMS starts charging batteries to absorb excess solar. At noon, EMS curtails industrial loads slightly to match supply. Grid stays balanced. No blackouts, minimal waste.