The Spanish power system is becoming increasingly difficult to operate. The peak load grows every year, and the permission to build new transmission and distribution infrastructures is difficult to obtain. In this scenario Demand Response can play an important role, and become a resource that could help network operators. The present deployment of demand response measures is small, but this situation however may change in the short term. The two main Spanish utilities and the transmission network operator are designing research projects in this field. All customer segments are targeted, and the research will lead to pilot installations and tests. Government plans to enforce the installation of smart meters in every home is a factor that can also play a relevant role. The seminar will provide an overview of the situation of the power system in Spain, and explain the research trends in the field of demand response in the country.