The dielectric relaxations of a biopolymer, collagen, have been studied by means of the thermally stimulated current (TSC) technique. To investigate effects of water on TSC spectra, complementary measurements by differential scanning calorimetry (DSC) have been performed. In dehydrated collagen, three spectral bands were recorded in the temperature range of -180-60 degrees C, labelled alpha, beta(1), and gamma in the order of decreasing temperature. The TSC spectrum of hydrated collagen exhibits a supplementary band labelled beta(2). By using the fractional polarization method, the gamma and beta(1) modes have been attributed to localized movements of nonpolar (apolar) sequences and polar sequences, respectively. The alpha mode has been associated with delocalized movements of the collagen macromolecules. Finally the beta(2) mode has been attributed to reorientations of bound water molecules inside the collagen fibers.