Module for recovery of energy of an aircraft cabin comprising at least one air outlet from the cabin and at least one fresh air inlet into the cabin, designed to be supplied by an environmental control system of the cabin, characterised in that the said module comprises: - a turbine engine comprising at least one compressor equipped with an air inlet and an air outlet, and at least one turbine equipped with an air inlet and an air outlet which are mechanically coupled to one another, - a duct, said cabin-air recovery duct, adapted to fluidically link an air outlet from the cabin and an air inlet of the said turbine, - a duct, said compressor supply duct, adapted to fluidically link an outside-air bleed device and an air inlet of the compressor, - a duct, said cabin-air injection duct, adapted to fluidically link an air outlet of the compressor and a fresh air inlet into the cabin, characterized in that the module further comprises: - an air flow control valve, said recovery valve, equipping said cabin-air recovery duct, - a duct, said emergency duct, adapted to fluidically link a high-pressure air source and an inlet of the turbine, the said emergency duct moreover being equipped with an air pressure control valve, said emergency valve, - a control unit for the said recovery valve and the said emergency valve, adapted to, according to predetermined operational conditions, activate at least one of the following modes of operation: • a mode, called routine mode, in which the said recovery valve is open and the said emergency valve is closed, in such a manner that the said turbine is exclusively supplied by the air evacuated from the cabin, • a mode, called emergency mode, in which the said recovery valve is closed and the said emergency valve is open, in such a manner that the said turbine is exclusively supplied by the air provided by the high-pressure air source. - a turbine engine comprising at least one compressor equipped with an air inlet and an air outlet, and at least one turbine equipped with an air inlet and an air outlet which are mechanically coupled to one another, - a duct, said cabin-air recovery duct, adapted to fluidically link an air outlet from the cabin and an air inlet of the said turbine, - a duct, said compressor supply duct, adapted to fluidically link an outside-air bleed device and an air inlet of the compressor, - a duct, said cabin-air injection duct, adapted to fluidically link an air outlet of the compressor and a fresh air inlet into the cabin, - an air flow control valve, said recovery valve, equipping said cabin-air recovery duct, - a duct, said emergency duct, adapted to fluidically link a high-pressure air source and an inlet of the turbine, the said emergency duct moreover being equipped with an air pressure control valve, said emergency valve, - a control unit for the said recovery valve and the said emergency valve, adapted to, according to predetermined operational conditions, activate at least one of the following modes of operation: • a mode, called routine mode, in which the said recovery valve is open and the said emergency valve is closed, in such a manner that the said turbine is exclusively supplied by the air evacuated from the cabin, • a mode, called emergency mode, in which the said recovery valve is closed and the said emergency valve is open, in such a manner that the said turbine is exclusively supplied by the air provided by the high-pressure air source. • a mode, called routine mode, in which the said recovery valve is open and the said emergency valve is closed, in such a manner that the said turbine is exclusively supplied by the air evacuated from the cabin, • a mode, called emergency mode, in which the said recovery valve is closed and the said emergency valve is open, in such a manner that the said turbine is exclusively supplied by the air provided by the high-pressure air source.