By installing a home energy storage system, for example, in combination with solar panels, homeowners can fundamentally change their interaction with the power grid. Such a system allows storing electricity during periods of low demand and low cost (for example, at night or on sunny days) and using it during peak load hours when tariffs are highest. This allows you to completely avoid expensive peak electricity costs. Moreover, if the system produces more energy than the household consumes, the surplus can be fed back into the grid. With the support of special programs such as green tariffs or net metering, this can not only reduce utility bills to zero, but can also generate additional income, turning the homeowner from a passive consumer into an active participant in the energy market.