The Centre de Recerca Matemàtica   (Center for Mathematical Research) organized on October 13 and 14 the Conference on Numerical Optimization and Applications in Engineering. The workshop provided a forum for researchers working on different aspects of optimization to present their recent discoveries, and to interact with people working on complementary aspects of optimization and mathematical programming. I was kindly invited to present the talk "Electricity Market Optimization: finding the best bid through stochastic programming".