NOVELTY - System (100) for providing energy for an energy grid (300) based on energy (1) provided by a renewable energy source, comprises: an hydrogen and nitrogen production unit to produce hydrogen (4) and nitrogen (5), and is operated using energy by renewable energy source; a mixing unit to receive and mix hydrogen and nitrogen; an ammonia source to receive and process hydrogen nitrogen mixture; and an ammonia power generator. The system further comprises hydrogen injection system for extracting a hydrogen portion from a stage and for adding to gas stream to be provided to ammonia power generator.    USE - The system is useful: for providing energy for energy grid based on energy provided by renewable energy source (claimed); and in local energy supply for heavy industry and rural areas, grid stabilization.    ADVANTAGE - The system: provides load balancing of intermittent renewable energy for an electricity grid; utilizes ammonia storage vessel as a buffer, which allows a better flexibility of providing energy to the energy grid; and has improved efficiency.    DETAILED DESCRIPTION - System (100) for providing energy for an energy grid (300) based on energy (1) provided by a renewable energy source, comprises: an hydrogen and nitrogen production unit for producing hydrogen (4) and nitrogen (5), where the hydrogen and nitrogen production unit is operated by using energy provided by the renewable energy source; a mixing unit configured to receive and mix the hydrogen and the nitrogen produced by the hydrogen and nitrogen production unit to form a hydrogen nitrogen mixture; an ammonia source for receiving and processing the hydrogen nitrogen mixture for generating a gas mixture containing ammonia, where the ammonia source comprises an ammonia storage vessel for storing at least a part of the ammonia of the gas mixture containing ammonia; and an ammonia power generator for generating energy for the energy grid, where the ammonia power generator is fluidly connected to the ammonia storage vessel to receive a gas stream containing ammonia from the ammonia storage vessel and where the ammonia power generator comprises a combustion chamber to combust the received ammonia of the gas stream to generate the energy for the energy grid. The system further comprises a hydrogen injection system for extracting a hydrogen portion from a stage of the system and for adding extracted hydrogen to the gas stream to be provided to the ammonia power generator. An INDEPENDENT CLAIM is also included for providing energy for an energy grid based on energy provided by a renewable energy source, where at least a part of the energy from the renewable energy source is used to produce hydrogen and nitrogen in hydrogen nitrogen production unit, the produced hydrogen and nitrogen are mixed in a mixing unit to form a hydrogen nitrogen mixture, the hydrogen nitrogen mixture is processed in an ammonia source to generate a gas mixture containing ammonia and ammonia of the gas mixture containing ammonia is stored in a ammonia storage vessel, a hydrogen portion is extracted from a stage of the system into a hydrogen injection system, ammonia is provided from the ammonia storage vessel and mixed with hydrogen from the hydrogen injection system to form ammonia hydrogen mixture, the ammonia hydrogen mixture is provided to a combustion chamber of an ammonia power generator and the provided ammonia hydrogen mixture is combusted in the combustion chamber for generating the energy for the energy grid.    DESCRIPTION OF DRAWING(S) - The figure shows a system for load balancing of an intermittent renewable energy source.    Energy (1)    Hydrogen (4)    Nitrogen (5)    System (100)    Energy grid (300)