As direct saturated steam is used and no ORC circle, storage requires a phase change module design (PCM). This technology allows the supply of necessary high energy inputs in very short time to change the hot water into steam. Unfortunately these systems are still expensive and matter of research and development. Once these systems are commercially available, they will support the CSP technology and allow full solar operation. Systems with storage times of 2 hours and more are technically feasible already, but the economics do not fit to the existing feed-in tariffs in Asia. We can assume that this may change within the next three years and operation time of CSP will be doubled. Fortunately CSP investments can be adapted easily to storage devices also at later stages of existing stations.