This chapter focuses on the analysis of TES technologies and the possibility of their integration into DHSs, to utilise energy surpluses and efficiently manage consumption variations. The principles of several heat storage methods, along with the calculation of storage capacities and economic indicators, are described. Sensible heat storage (SHS) technologies, including water tanks, underground storage, and packed-bed systems, are reviewed. Latent heat storage (LHS) systems associated with phase-change materials (PCMs) and thermochemical heat storage (TCHS) are also discussed. Additionally, a comprehensive study on the development of LHS systems includes the classification and comparison of the advantages and disadvantages of different categories of PCMs, along with their thermophysical properties and selection criteria. It focuses on heat transfer and enhancement techniques (low-density materials, porous materials, metal matrix, macro- and micro-encapsulation, extended metal surfaces, heat pipes, and cascaded storage) employed in PCMs to charge and discharge latent heat energy effectively. The mathematical definitions of the standard dimensionless numbers and various correlations between thermal performance and dimensionless numbers are provided. A simulation model of a centralised LHS with fins is developed for analysing the thermal performance of the melting process, both for quasi-steady-state and transient conjugate heat transfer problems. The modelling of TES systems is also approached by describing a general heat transfer model that facilitates system design optimisation. Finally, the implementation of TES technologies in a DHS is briefly discussed.