The environmental urgency of reducing the use of energy sources from fossil fuels by encouraging their replacement with renewable ones has led to a series of technological challenges to be faced, due to the uncontrollability of these sources and the difficulty of obtaining an exact forecast of their availability. The current research direction considers the implementation of large-scale energy storage systems as a possible way to handle with these aspects. The work of this thesis, developed within the STORE&GO project framework, proposes the adoption of the Power-to-Gas technology, whose integration into the network has been analysed through two models of simulation of the day-ahead and intraday market, and its consequent impact on the operation of the network.