To study transverse momentum distribution of particle production 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. I will discuss how one can calculate power corrections to TMD factorization through the solution of equations of motion in background fields of colliding hadrons.