(see also: Essential reliability servicesA combination of automated and manual controls grid operator…) – Supplementary services essential for maintaining the reliable operation and stability of the electrical gridThe electrical grid is a vast, interconnected network compri… beyond the basic generationThe process of creating electricity. and transmissionThe process (and infrastructure) of moving large amounts of … of energy. They are “behind-the-scenes” services that include real-time balancing of electricity supply and demand, maintaining voltageOften described as the “pressure” that pushes electric curre… levels, and providing the capability to restart the grid after a widespread outage (black start).