NOVELTY - Production of hydrogen and electricity comprises providing a system (100) for producing liquid hydrogen and/or electricity. The system comprises a gas reforming unit (110) for receiving a natural gas feed and reforming a natural gas (115) to produce a hydrogen-containing gas; an electricity generation unit (165); and a hydrogen liquefaction unit (190). During a first period, the natural gas is provided to the gas reforming unit and the system is operated to export hydrogen. During a second period, natural gas is provided to gas reforming unit and the system is operated to export electricity.    USE - Method for producing hydrogen and electricity.    ADVANTAGE - The optimal use can be made of the economy of scale. When the hydrogen-containing gas does not comprise significant amounts of nitrogen, as the carbon dioxide can be easily obtained in concentrated form from the combustion flue gas by condensing the steam in the flue gas. This has the advantage that the heat of combustion of combusting the carbon monoxide is used directly to generate additional power.    DETAILED DESCRIPTION - Production of hydrogen and electricity comprises providing a system (100) suitable for producing liquid hydrogen and/or electricity. The system comprises a gas reforming unit (110) arranged to receive a natural gas feed and to reform a natural gas (115) to produce a hydrogen-containing gas; an electricity generation unit (165) arranged to receive part of the hydrogen in the hydrogen-containing gas and to convert the hydrogen to generate electricity; and a hydrogen liquefaction unit (190) arranged to receive part of the hydrogen in the hydrogen-containing gas and to liquefy the hydrogen to produce liquid hydrogen, which hydrogen liquefaction unit during operation is powered by part of the electricity produced by the electricity generation unit. During operation, the system is arranged to export liquid hydrogen and/or electricity. During a first period, the natural gas is provided to the gas reforming unit and the system is operated to export hydrogen. During a second period, natural gas is provided to the gas reforming unit and the system is operated to export electricity.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram representing a system suitable for producing liquid hydrogen and/or electricity.    System for producing liquid hydrogen and/or electricity (100)    Gas reforming unit (110)    Natural gas (115)    Electricity generation unit (165)    Hydrogen liquefaction unit (190)