This thesis work has been performed in the framework of a research contract involving ENEA and the Energy department at Politecnico di Torino, which deals with thermal energy storage in the context of a hybridized CSP-PV system. The electricity produced by the PV system must be transformed into heat in order to be accumulated in a single-medium (molten salt) TES. For this purpose, microwave heating has been proposed as an efficient way to heat up the molten salt by using the electricity generated from the PV panels. However, the experience of heating up the molten salt by using microwaves is very limited; for this reason, an experiment is being carried out at ENEA to prove its feasibility.