  We study a class of nonperturbative corrections to single-inclusive photon
cross sections at measured transverse momentum p_T, in the large-x_T limit. We
develop an extension of the joint (threshold and transverse momentum)
resummation formalism, appropriate for large x_T, in which there are no
kinematic singularities associated with recoil, and for which matching to fixed
order and to threshold resummation at next-to-leading logarithm (NLL) is
straightforward. Beyond NLL, we find contributions that can be attributed to
recoil from initial state radiation. Associated power corrections occur as
inverse powers of p_T^2 and are identified from the infrared structure of
integrals over the running coupling. They have significant energy dependence
and decrease from typical fixed-target to collider energies. Energy
conservation, which is incorporated into joint resummation, moderates the
effects of perturbative recoil and power corrections for large x_T.
