A mono-pressure plant for the continuous production of nitric acid, comprising: - an ammonia convertor, configured for operating at a working pressure ranging between 2 bar and 16 bar, for oxidizing ammonia, thereby producing a gaseous NOx gas/steam mixture, the ammonia convertor comprising at least one inlet for a stream of ammonia and pressurized air, preferably a stream of an ammonia/pressurized air mixture, and an outlet for the gaseous NOx gas/steam mixture; - an air compressor, in fluid communication with the ammonia convertor, for pressurizing air to the working pressure; - an absorber unit, configured for operating at the working pressure, particularly at the working pressure reduced by the pressure drop in the ammonia convertor and during transport of the NOx gas stream to the absorber unit, particularly at the working pressure reduced by 0.01 bar to 1 bar, wherein the nitrogen oxides contained in a gaseous NO x stream react with water, thereby producing nitric acid, the absorber unit comprising an inlet for a gaseous NOx stream, an inlet for an aqueous solution, an outlet for a product stream containing a nitric acid solution and dissolved nitrogen oxides, and an outlet for a tail gas; - a first bleacher unit, configured for operating at a pressure that is at least 0.01 bar to 1 bar higher than the working pressure reduced by the pressure drop in the ammonia convertor and during transport of the NOx gas stream to the absorber unit, and up to 30 bar, for stripping the dissolved nitrogen oxides from the output product stream, thereby producing a first NO x -loaded stripping gas, the bleacher unit comprising an inlet for a stripping medium and an inlet for the product stream, an outlet for the first NOx-loaded stripping gas and an outlet for the stripped nitric acid stream; and - a means for directing the first NO x -loaded stripping gas to the inlet of the absorber unit; the plant being characterized in that: - the plant further comprises a pressurised water electrolyser as a source of oxygen-rich gas at a pressure of 2 to 30 bar, wherein the oxygen-rich gas comprises more than 21 vol% oxygen, for providing the bleacher unit with an oxygen-rich gas as a stripping medium via the inlet for the stripping medium; and - optionally, the plant further comprises means for lowering the pressure of the first NO x -loaded stripping gas to a pressure that is 0.01 bar to 1 bar higher than the working pressure, reduced by the pressure drop in the ammonia convertor and during transport of the NOx gas stream to the absorber. - an ammonia convertor, configured for operating at a working pressure ranging between 2 bar and 16 bar, for oxidizing ammonia, thereby producing a gaseous NOx gas/steam mixture, the ammonia convertor comprising at least one inlet for a stream of ammonia and pressurized air, preferably a stream of an ammonia/pressurized air mixture, and an outlet for the gaseous NOx gas/steam mixture; - an air compressor, in fluid communication with the ammonia convertor, for pressurizing air to the working pressure; - an absorber unit, configured for operating at the working pressure, particularly at the working pressure reduced by the pressure drop in the ammonia convertor and during transport of the NOx gas stream to the absorber unit, particularly at the working pressure reduced by 0.01 bar to 1 bar, wherein the nitrogen oxides contained in a gaseous NO x stream react with water, thereby producing nitric acid, the absorber unit comprising an inlet for a gaseous NOx stream, an inlet for an aqueous solution, an outlet for a product stream containing a nitric acid solution and dissolved nitrogen oxides, and an outlet for a tail gas; - a first bleacher unit, configured for operating at a pressure that is at least 0.01 bar to 1 bar higher than the working pressure reduced by the pressure drop in the ammonia convertor and during transport of the NOx gas stream to the absorber unit, and up to 30 bar, for stripping the dissolved nitrogen oxides from the output product stream, thereby producing a first NO x -loaded stripping gas, the bleacher unit comprising an inlet for a stripping medium and an inlet for the product stream, an outlet for the first NOx-loaded stripping gas and an outlet for the stripped nitric acid stream; and - a means for directing the first NO x -loaded stripping gas to the inlet of the absorber unit; - the plant further comprises a pressurised water electrolyser as a source of oxygen-rich gas at a pressure of 2 to 30 bar, wherein the oxygen-rich gas comprises more than 21 vol% oxygen, for providing the bleacher unit with an oxygen-rich gas as a stripping medium via the inlet for the stripping medium; and - optionally, the plant further comprises means for lowering the pressure of the first NO x -loaded stripping gas to a pressure that is 0.01 bar to 1 bar higher than the working pressure, reduced by the pressure drop in the ammonia convertor and during transport of the NOx gas stream to the absorber.