Energy storage power station connected to the grid at night

What is a battery energy storage system?

A battery energy storage system (BESS) is an electrochemical device that charges (or collects energy) from the grid or a power plant and then discharges that energy at a later time to provide electricity or other grid services when needed.

What is grid-scale storage?

Grid-scale storage refers to technologies connected to the power grid that can store energy and then supply it back to the grid at a more advantageous time – for example, at night, when no solar power is available, or during a weather event that disrupts electricity generation.

What is energy storage & how does it work?

Without energy storage, electricity must be produced and consumed at exactly the same time. Energy storage systems allow electricity to be stored—and then discharged—at the most strategic and vital times, and locations. Co-located energy storage systems are installed alongside renewable generation sources such as solar farms.

What is a co-located energy storage system?

Co-located energy storage systems can be either DC or AC coupled. AC coupled configurations are typically used when adding battery storage to existing solar photovoltaic (PV) systems, as they are easier to retrofit. AC coupled systems require an additional inverter to convert the solar electricity from AC back to DC in order to charge batteries.

How do utility-scale battery storage systems work?

Simply put, utility-scale battery storage systems work by storing energy in rechargeable batteries and releasing it into the grid at a later time to deliver electricity or other grid services. Without energy storage, electricity must be produced and consumed at exactly the same time.

Why is energy storage important?

Energy storage is critical to advancing our resilient energy future. How do battery energy storage systems work? Simply put, utility-scale battery storage systems work by storing energy in rechargeable batteries and releasing it into the grid at a later time to deliver electricity or other grid services.