A study is made of the effect of electron–electron collisions on the hot‐electron galvanothermo‐magnetic transport properties of III–V nonparabolic semiconductors at low temperatures (k0T ≪ ħ ω1, where ħ ω1 is the limiting energy of an optical phonon). Under these conditions the electron energy is dissipated mainly in inelastic processes in which optical phonons are spontaneously emitted in the active region (ϵ > ħ ω1), and the momentum is dissipated in elastic collisions with ionized impurities and acoustic phonons in the passive region (ϵ > ħ ω1). It is assumed that e‐e collisions control only the energy exchange in the passive region. The electron temperature calculated from the theory for n‐type InSb at 4.2°K shows a good agreement with the experimental results of Miyazawa.