Due to the variability of the weather and its demand, solar and wind energy output are difficult to predict accurately. Their price variability has therefore increased during the day, which strengthened the business case for energy storage. To follow consumer demand patterns, solutions of energy storage systems like B2G (Battery-to-Grid) and V2G (Vehicle-to-Grid) have been deployed. Nevertheless, these technologies use the Power-Line Communication systems at its endpoints and might present some interesting vectors of attack. In this talk, we will talk about the HomePlug technologies used in this context, and introduce our attacks against V2G systems with a Proof of Concept. Then we will talk about some advancement made around HomePlug that is used for domestic, industrials and smart cities purposes.