The Airbus/Rolls-Royce/Siemens E-Fan X was a hybrid electric aircraft demonstrator being developed by a partnership of Airbus, Rolls-Royce plc and Siemens. Announced on 28 November 2017, it followed previous electric flight demonstrators towards sustainable transport for the European Commission’s Flightpath 2050 Vision. A BAe 146 flying testbed was to have one of its four Lycoming ALF502 turbofans replaced by a Siemens 2 MW (2,700 hp) electric motor, adapted by Rolls-Royce and powered by its AE2100 turboshaft, controlled and integrated by Airbus with a 2 t (4,400 lb) battery. In April 2020, the programme was cancelled during the COVID-19 pandemic.