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The formation and properties of thermodonors‐II (TD‐II, Tanneal = 650 °C) in Czochralski‐grown silicon crystals are studied experimentally (EPR, Hall effect) and theoretically. Additionally the energy level spectrum and the paramagnetic properties of TD‐II are investigated. A model of TD‐II is proposed, which takes into consideration the localization of electrons on crystalline potential fluctuations due to oxygen clusters. The model explains the presence of the quasicontinuous spectrum of TD‐II levels as well as the dependence of the depth of their location on the size of oxygen clusters. The g‐factor shift, asymmetry, anisotropy of the electron paramagnetic resonance (EPR) line width and spin relaxation characteristics of TD‐II, as well as the dependence of the parameters of centers on the duration of annealing, and the presence of acceptors introduced either through doping or γ‐irradiation of the specimens are also explained.