The transmission system operators (TSOs) have been working for several years on the implementation of the NC TAR (EU Regulation No. 2017/460 of 16 March 2017) in the German regulatory regime, which aims to harmonize the transmission tariff structures. In 2019, the Federal Network Agency adopted the REGENT regulation, which stipulates the calculation of the reference price on the basis of distance-independent stamps by the TSOs. For the assessment of the volume risk pursuant to Art. 7 p. 2 lit. d of Regulation (EU) 2017/460, this report is intended to contribute.