The vast majority of companies and institutions have become "free-market" energy consumers in Brazil.
As such, they receive two bills: one for the energy itself and one for grid usage (transmission and distribution - "wire fees").
The energy bill represents the higher cost. It features a single price, regardless of the time of day.
The grid usage bill, however, depends on the chosen tariff, which is based on peak and off-peak hours.
Any installed battery systems would primarily serve to provide stored energy in the event of a power outage from the local utility. This according to the ongoing regulations.
This is the value storage offers to this type of customer. It is often compared to generator sets; these are solutions with different characteristics that require careful evaluation. Batteries typically provide power for a short duration, whereas generator sets can operate for extended periods.