To study transverse momentum distribution of particles produced in hadron-hadron collision one can use transverse momentum dependent (TMD) factorization approach. The TMD factorization is valid in the limit of infinitely small transverse momentum, i.e. when the transverse momentum of a produced particle is much smaller than its invariant mass. To apply the TMD factorization in the region of moderate transverse momentum one has to include power corrections. We will discuss how one can calculate power corrections to TMD factorization through the solution of the equations of motion in background fields of the colliding hadrons.