A Battery Energy Storage System (BESS) is a technology that stores electrical energy from renewable and non-renewable sources in rechargeable batteries, so that it can be used later. Instead of electricity being wasted when supply exceeds demand, it is stored and then released when it is needed. The technology is pivotal to energy stability and flexibility, and essential to the replacement if fossil fuels with renewable energy.
Battery energy storage systems are advanced technologies that charge and discharge energy according to demand, through intelligent battery software. Using a bidirectional inverter, DC power is converted to AC and vice versa depending on the direction of energy flow. The inverters convert energy, and the control software decides when to store or release energy.
Together, these technologies allow BESS to store power and deliver it when needed.
Speak to our team about commercial battery solutions
Key Takeaways
- Battery Energy Storage Systems (BESS) store electricity for later use
- They help balance supply and demand on the power grid
- BESS supports renewable energy like solar and wind
- Systems use rechargeable batteries, inverters, and control software
- They improve energy reliability, stability and resilience
What is Battery Storage and How Exactly Does it Work?
Battery storage technology plays a key role in ensuring homes and businesses maximise green energy sources, even when the sun isn’t shining. Power from the National Grid suffers daily peaks and troughs as supply and demand fluctuate. This wastes energy and increases energy cost. With Battery Energy Storage Systems, excess energy can be stored for later use, reducing strain on the grid and capturing unused renewable energy.
A BESS is a type of backup power solution that collects energy from renewable sources, such as solar panels and stores it using battery storage technology. The batteries discharge to release energy when necessary, such as during peak demands, power outages or grid balancing.
Types of Batteries Used in BESS
Different batteries are used depending on cost, performance, lifespan, and application. Lithium-ion batteries dominate the market because they offer high efficiency and fast response times. The cost of lithium-ion batteries is falling considerably due to their widespread use in the EV industry.
| Battery Type | Common Use |
| Lithium-ion | Most common due to their high energy density and efficiency |
| Lead-acid | Older technology, lower cost but shorter lifespan |
| Flow batteries | Used for long-duration storage applications |
| Sodium-ion / emerging chemistries | Developing technologies for future storage |
Advantages of Battery Energy Storage Systems
Combining BESS with renewable and non-renewable energy generation harnesses valuable benefits:
- Reduce Energy Costs – allows you to store low-cost energy and discharge it during peak times when the cost is high.
- Reduce Grid Dependency – used as backup power for a continuous energy supply during power cuts and extreme weather events.
- Maximise Renewable Energy – allows you to store unused renewable energy for use later, reducing carbon emissions from power generated from fossil fuels.
- Frequency Control – smooths frequency peaks and troughs and improves balance on the grid. BESS helps by reacting almost instantly to frequency changes, and sending power to the grid as required.
BESS Applications
Battery Energy Storage Systems are a key component of today’s energy infrastructure. They enhance energy efficiency, support the integration of renewable energy, and improve grid stability. BESS is proving beneficial in a variety of applications:
| Application | How BESS Is Used |
| Renewable energy farms | Store excess solar/wind power |
| Commercial buildings | Reduce peak energy costs (peak shaving) |
| Data centres & hospitals | Provide backup power |
| Utility grids | Frequency regulation and load balancing |
| EV charging sites | Manage high demand and reduce grid strain |
How BESS Works with Power Generators
Power generator solutions and BESS are both backup power sources that work together to maintain reliable, stable power. Combining both technologies improves power stability and reliability. Batteries respond instantly to sudden changes in electricity demand or supply, helping to balance the grid and provide immediate backup during an outage. Generators, on the other hand, produce electricity for longer periods using fuel, making them ideal for extended power cuts or sustained high demand. By combining fast-acting battery storage with the long-duration capability of generators, energy systems become more resilient, efficient, and better able to support renewable energy.
Talk to our energy storage experts today
Final Thoughts
At Vital Power Solutions, we understand how Battery Energy Storage Systems (BESS) are a key part of the essential energy infrastructure. BESS helps businesses become more efficient and energy-independent by reducing peak tariffs and downtime.
With expert guidance, robust equipment and ongoing support, Vital Power helps businesses lower their carbon footprint and maximise efficiency. Partner with Vital Power for end-to-end energy storage and let our experts help you design a resilient power solution for your business.
Anna Eyre
Digital Marketing Lead
Share:
