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This study analyzes the improvement of mixture homogeneity between natural gas and hydrogen within a pipeline by inserting a static mixer inside. Recurring to Ansys Fluent, three different cases were simulated to test the mixing. The performance of an helicoidal mixer (KMS) and a KVM mixer were analyzed and compared to the standard T-junction without static mixer. The required distance for achieving a homogeneous mixture, measured by the coefficient of variation (COV), was calculated and compared with the resulting pressure loss. The three cases were analyzed for hydrogen injection percentages until 20 % and for a gas pipeline connecting the transmission line to the distribution line (P = 18 bar). The use of static mixers facilitates a faster homogenization of the mixture. Among these mixers, the KVM mixer performed the best, achieving a homogeneous mixture over a shorter distance while incurring a lower pressure loss. • The Hydrogen injection in the natural gas network is presented with the review. • The homogenization of the mixture of hydrogen and methane in a pipe was evaluated. • CFD analysis to study the use of static mixers to enhance the mixture homogeneity. • Improved mixture homogeneity achieved by using static mixers. • The use of a KVM mixer is suggested. [ABSTRACT FROM AUTHOR]