In this paper, we discuss the sample average approximation (SAA) method applied to a class of stochastic mathematical programs with variational (equilibrium) constraints. To this end, we briefly investigate piecewise structure and directional differentiability of both -- the lower level equilibrium solution and objective integrant. We show almost sure convergence of optimal values, optimal solutions (both local and global) and generalized Karush-Kohn-Tucker points of the SAA program to their true counterparts. We also study uniform exponential convergence of the sample average approximations, and as a consequence derive estimates of the sample size required to solve the true problem with a given accuracy. Finally we present some preliminary numerical test results.

## Citation

Preprint, School of Industrial and Systems Engineering, Georgia Institute of Technology, Antalanta, Georgia 30332-0205, USA