Value of Storage for Renewable Portfolio Standard

The ambitious targets for renewable energy penetration warrant huge flexibility in the power system. Such flexibility does not come free. This paper examines the possibility of utilizing storage systems for achieving high renewable energy penetration, and identify the trade-off between providing flexibility and arbitraging against real-time prices. More precisely, we investigate the relationship among the operation cost, storage capacity, and the renewable penetration level. This illustrates the value of storage as well as the true cost induced by the high renewable penetration targets.