Identify the documents governing the provision of ancillary services in the region where you live or in another region of your choice. Determine the mechanism used to obtain each service. When services are compulsory, determine their parameters (e.g. minimum lead and lag power factor for generators). When services are procured on a competitive basis, describe the structure of the markets for ancillary services (duration of contracts, bid parameters). Pay particular attention to the definition of reserve services. Identify the mechanism used to pass on the cost of ancillary services to consumers.Identify the documents governing the provision of ancillary services in the region where you live or in another region of your choice.