--fugitive emissions from hydro reservoirs, --fugitive emissions of SF6 and coolant leaks. 100 80 Group perimeter The Group perimeter is determined by the consolidation method applied to companies, in line with financial standards (IAS IFRS (4... --fugitive emissions from hydro reservoirs, --fugitive emissions of SF6 and coolant leaks. --amortisation of emissions from the production of fixed assets (power plants, SEI electricity networks, buildings, vehicles and equipment.