Due to the increasing fluctuations in the quality of natural gas in the Danish gas grid, there is a challenge determining the calorific value in the Danish distribution gas grid. This requires intelligent and innovative software solutions that can track, calculate and simulate the gas quality in the grid. The objective of this RFI is to identify the market offerings of software, that can calculate the calorific values and the gas components based on different input and output data from consumers, flowmeters, metering stations, mix of different type of gases, etc. in different parts of the grid. By implementing an intelligent software GasNet and Dansk Gas distribution wants to avoid investing in expensive and complex metering technologies.