The analysis of the theory of the elementary act of electrochemical reactions in relation to the fluctuation-dissipation theorem shows that in the neighbourhood of the equilibrium state the fluctuational self-consistency of the theory holds if an integral number of electrons is transferred in the elementary reaction act. The fluctuational self-consistency must also exist for the electrode processes with partial charge transfer. However, this requirement results in a non-zero correlation between fluctuations of the electrochemical reaction rate and the fluctuations of the number of electrons involved in the elementary act.