The 24th edition of the European Conference on Operational Research was held this year in Lisbon. I participate with two invited presentations. The first contribution "Optimal day-ahead bidding strategy with futures and bilateral contracts. Scenario generation by means of factor models", co-authored with Cristina Corchero , was presented in the Session Applications of stochastic programming to the energy sector-electricity. The second invited contribution, in collaboration with professor Eugenio Mijangos from the University of the Basque Country, was the work "Perspective cuts for solving the optimal electricity market bid problem with bilateral contracts", presented in the session Large-scale Mixed Optimization Problems. I also was the chairman of this last session.