certified ancillary service

this is the contractual provision of regulation electricity (positive or negative) by an entity that meets the technical and commercial conditions determined by TSO regulations. A contractual commitment to the minimum availability of regulation electricity is required. Financial rewards are offered for the regulation electricity provided, as well as for availability even when regulation electricity is not provided. In the event that the TSO detects an entity's inability to comply with the agreed availability period, the entity is fined. Certified ancillary service is mainly provided by entities burning fossil-fuels, such as heating plants and diesel generators. Green providers of certified ancillary services can be transfer tanks or entities burning biomass, and now also battery storage systems.