Grid Battery Energy Storage Systems

Grid battery energy storage systems are typically MWh units grouped to provide 10 to 250MWh of storage. Often though these systems are specified in terms of power capability and duration. This definition fits with the language used utility scale systems.

These Grid BESS installations can provide:

Frequency Regulation: One of the more important ones is frequency regulation. In frequency regulation applications, the frequency is adjusted based on the loads that are active and demanding variable power, as necessary. They provide “up” regulation by discharging and “down” regulation by charging.
Peak Shaving: Another important application is peak shaving, where the energy storage system is discharged during and “on-peak” period and charged during an “off-peak” period.
Voltage Support: This is also important and is where the power is used to maintain the voltage within specified limits.
Phase Balancing: Phase balancing is the process of keeping the load at each phase as balanced or equal as possible.
Energy Trading: Energy trading is where bulk energy is bought or sold and moved to an area of need.

In 2025 we think of the units being in 20ft containers, but in reality there is no definition of a Grid BESS. In the future the bi-directional Vehicle to Grid (V2G) approach could enable every electric vehicle connected with a charging cable to absorb (charge) and discharge into the local grid. This could be to support your house, street or neighbourhood.

Global Standards Certifications for BESS

The Global Standards Certifications for BESS container based solutions is significant. As Battery Energy Storage Systems become critical to modern power infrastructure, compliance with international standards ensures safety, performance, and interoperability across components from cells to containerized systems.

Grid-Forming vs. Grid-Following Inverters

Historically the inputs to an electricity grid have been large rotating machines that inherently have a large inertia. This means that even with a large change in demand in failure of a supply element the frequency is maintained. A small change in frequency is often an indicator that a change in supply is required. The inertia in machines is large enough that there are a few seconds to react.

The move to renewable sources, solar and wind, means that there is less inertia in the system. Changes in supply or load can have a faster and more significant impact on the grid frequency.

Long Duration Energy Storage (LDES) is a system that can store energy for more than 8 hours and in some cases for weeks.