Assessment of load shifting potential on large insular power systems

This paper examines the value of load shifting (LS) and its impact on the scheduling and operation of large insular power systems which are typically characterized by high electricity generation cost and often by high Renewable Energy Resources (RES) share in the generation mix. An optimization model for the integration of load shifting in the unit commitment problem is presented and consecutive daily simulations with hourly granularity are carried out for a year, for different scenarios of LS potential. A LS transaction cost is also incorporated into the model, accounted for the inconvenience created to the consumers for time shifting their demand. Real-world data from the large insular power system of Crete are used. Simulation results are presented and conclusions regarding the value of LS on generation cost savings, the impact of LS on generation mix modification and LS impact on units´ cycling are derived. Finally, insights on the optimal LS integration level in such power systems and the value of LS for systems with high RES penetration are also given.