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Results of a thermoelectric power component (S f ) and electrical resistivity (ρ f ) measurements connected with the temperature unstable intermediate valence of Ce are presented for CeNi, CeNi 2 and CeNi 2 Si 2 compounds in the temperature range 4-800 K. It is shown that dependences S f (T ) and ρ f (T ) are well described in a wide temperature range within the framework of a simple model of a narrow peak in the density of states g f (E) of Lorentzian shape near the Fermi level. The width of the peak depends on temperature and defines the characteristic single-ion Kondo temperature T K .