Under the Capacity Market (CM), Suppliers are obligated to pay a monthly CM Supplier Charge to cover the costs of Capacity Provider payments, where they have made a supply during the Peak Period. This charge is apportioned across Suppliers by their share of the Total Gross Demand for the Peak Period within a Delivery Year. The Peak Period shall mean the Winter months between Nov – Feb (inclusive). This dataset provides forecast and actual Winter Peak Gross Demands by delivery years.