The methods due to Bloch and Pines have been used to calculate the energy loss of channeled protons. The contribution from the various atomic shells to the stopping power is assumed to be additive. The collective effects in a solid plasma produced by the valence electrons are calculated disregarding the band structure. The nonuniform distribution of valence electrons across the channel is taken into account. In contrast to Robinson and Dettmann, a detailed summation is performed over the spectrum of oscillator strengths when calculating the energy loss due to inner-shell electrons.