The progressively increasing penetration of electricity from solar photovoltaic plants, needed for a successful deployment of renewable energy sources, strongly depends on the economic cost of system integration, that should also mitigate the intermittency of PV electricity. Among the different available energy storage systems that could be applied to compensate the fluctuating PV power, Superconductive Magnetic Energy Storage (SMES) are attractive because of their high deliverable power and efficiency, and their virtually infinite number of charge-discharge cycles without degradation. Here we present the design of a module for a 10 MW toroidal YBCO SMES, with a charge/discharge time of 1 s, including the superconducting coil, the power feeding system and the cryogenic cooling.