Reserves and retained earnings Reserves and retained earnings Net of revenue and cost of energy sales and other [abstract] Net of revenue and cost of energy sales and other [abstract] Changes in working capital for regulatory assets Changes in working capital for regulatory assets Net of revenue and cost of energy sales and other Net of revenue and cost of energy sales and other Cash payments relating to property, plant and equipment and intangible assets Cash payments relating to property, plant and equipment and intangible assets Trade payables and other liabilities from commercial activities - Non current Trade payables and other liabilities from commercial activities - Non current Income tax expense and extraordinary contribution to the energy sector (CESE) [abstract] Income tax expense and extraordinary contribution to the energy sector (CESE) [abstract] Dividends recognised as distributions to non-controlling interests Depreciation, amortisation and impairment loss (reversal of impairment loss) recognised in profit or loss Institutional partnerships in North America Institutional partnerships in North America Tax assets - Current Tax assets - Current Payments of lease liabilities, classified as financing activities Receipts relating to financial debt (include Collateral Deposits) Receipts relating to financial debt (include Collateral Deposits) Cash flows from (used in) financing activities Operations with North American companies Operations with North American companies Extraordinary contribution to the energy sector (CESE) Extraordinary contribution to the energy sector (CESE) Debtors and other assets from commercial activities - Non current Debtors and other assets from commercial activities - Non current Cash flows from (used in) investing activities Fair Value Reserve (Cash flow Hedge) - Subsidiaries Fair Value Reserve (Cash flow Hedge) - Subsidiaries Profit before income tax and CESE Profit before income tax and CESE Profit before income tax and CESE Receipts/(payments) relating to loans from related parties Receipts/(payments) relating to loans from related parties Tax effect from the fair value reserve (cash flow Hedge) - Subsidiaries Tax effect from the fair value reserve (cash flow Hedge) - Subsidiaries Income tax expense and extraordinary contribution to the energy sector (CESE) Income tax expense and extraordinary contribution to the energy sector (CESE) Income tax expense and extraordinary contribution to the energy sector (CESE) (Gains) / Losses on disposal and scope effects except Asset Rotation (Gains) / Losses on disposal and scope effects except Asset Rotation Debtors and other assets from commercial activities - Current Debtors and other assets from commercial activities - Current Receipts/(payments) relating to derivative financial instruments Receipts/(payments) relating to derivative financial instruments Inflows of cash from investing activities Resultado líquido antes de proveitos financeiros e custos financeiros, impostos sobre os lucros e contribuição extraordinária para o sector energético (CESE) [abstract] Profit loss before provisions, amortisation and impairment, financial income and financial expenses, income tax expense and extraordinary contribution to the energy sector (CESE) [abstract] Inflows of cash from investing activities [abstract] Inflows of cash from investing activities [abstract] Other comprehensive income that will not be reclassified to profit or loss, net of tax [abstract] Other comprehensive income that will not be reclassified to profit or loss, net of tax [abstract] Adjustments for Joint ventures and associates Adjustments for Joint ventures and associates Tax effect from the fair value reserve (cash flow hedge) - joint ventures and associates Tax effect from the fair value reserve (cash flow hedge) - joint ventures and associates Cash flows from (used in) operating activities Other income, supplies ans services, personnel costs and employee benefits, other expenses and impairment losses on trade receivables and debtors Other income, supplies ans services, personnel costs and employee benefits, other expenses and impairment losses on trade receivables and debtors Trade payables and other liabilities from commercial activities - Current Trade payables and other liabilities from commercial activities - Current Provisions expenses Provisions expenses Profit loss before financial income and financial expenses, income tax expense and extraordinary contribution to the energy sector (CESE) [abstract] Outflows of cash from investing activities [abstract] Outflows of cash from investing activities [abstract] Share capital increases/(decreases) (includes subscribed by non-controlling interests) Share capital increases/(decreases) (includes subscribed by non-controlling interests) Extension line items 1 Extension line items 1 Cash payments relating to changes in cash resulting from consolidation perimeter variations Cash payments relating to changes in cash resulting from consolidation perimeter variations Interest and similar costs of loans from related parties including hedge derivatives Interest and similar costs of loans from related parties including hedge derivatives Tax expense (income) Collateral deposits associated to financial debt - Current Collateral deposits associated to financial debt - Current Cash receipts relating to property, plant and equipment and intangible assets Cash receipts relating to property, plant and equipment and intangible assets Extension hypercube 1 Extension hypercube 1 Dividends paid to non-controlling interests, classified as financing activities Joint ventures and associates Joint ventures and associates Profit before income tax and CESE [abstract] Profit before income tax and CESE [abstract] Cost of energy sales and other Cost of energy sales and other Cost of energy sales and other Non current tax assets Non current tax assets Interest and similar costs of financial debt including hedge derivatives Interest and similar costs of financial debt including hedge derivatives Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities Tax liabilities - Current Tax liabilities - Current Fluxos de caixa de (utilizados em) unidades operacionais Treasury stock sold/(purchased) Treasury stock sold/(purchased) Other income, supplies and services, personnel costs and employee benefits, other expenses and impairment losses on trade receivables and debtors [abstract] Other income, supplies and services, personnel costs and employee benefits, other expenses and impairment losses on trade receivables and debtors [abstract] Intermediation of electricity system flows financing Intermediation of electricity system flows financing Profit loss before provisions, amortisation and impairment, financial income and financial expenses, income tax expense and extraordinary contribution to the energy sector (CESE) Profit loss before provisions, amortisation and impairment, financial income and financial expenses, income tax expense and extraordinary contribution to the energy sector (CESE) Acquisition of remaining stake in wind farms in Europe Acquisition of remaining stake in wind farms in Europe Dividends recognised as distributions to owners of parent Fair value reserve (cash flow hedge) - joint ventures and associates Fair value reserve (cash flow hedge) - joint ventures and associates Other reserves and retained earnings [Member] Other reserves and retained earnings [member] Collateral deposits associated to financial debt - Non current Collateral deposits associated to financial debt - Non current Changes in working capital to personnel Changes in working capital to personnel Cash flows from (used in) operations [Abstract] Fluxos de caixa de (utilizados em) unidades operacionais [abstract] Cash and cash equivalents reclassified as held for sale Cash and cash equivalents reclassified as held for sale Cash receipts relating to changes in cash resulting from consolidation perimeter variations Cash receipts relating to changes in cash resulting from consolidation perimeter variations Cash advances and loans made to other parties, classified as investing activities Imposto sobre o rendimento e CESE Income tax and CESE Other expenses, by nature Other cash payments to acquire equity or debt instruments of other entities, classified as investing activities Dividends paid to equity holders of parent, classified as financing activities Other comprehensive income that will be reclassified to profit or loss, net of tax [abstract] Other comprehensive income that will be reclassified to profit or loss, net of tax [abstract] Receipts/(payments) related with transactions with non-controlling interest without change of control Receipts/(payments) related with transactions with non-controlling interest without change of control Equity attributable to owners of parent [abstract] Equity attributable to owners of parent [abstract] (Payments) relating to financial debt (include Collateral Deposits) (Payments) relating to financial debt (include Collateral Deposits) Receipts/(payments) relating to loans from non-controlling interests Receipts/(payments) relating to loans from non-controlling interests Increase (decrease) in cash and cash equivalents before effect of exchange rate changes Profit loss before financial income and financial expenses, income tax expense and extraordinary contribution to the energy sector (CESE) Profit loss before financial income and financial expenses, income tax expense and extraordinary contribution to the energy sector (CESE) Services expense Interest and similar costs relating to loans from non-controlling interests Interest and similar costs relating to loans from non-controlling interests Receipts/(payments) from institutional partnerships - North America Receipts/(payments) from institutional partnerships - North America