Battery energy storage systems (BESS) are the key to unlocking the full potential of intermittent renewable energy by enabling grid networks to operate efficiently, and replacing the need for flexible power provided through fossil fuels.

Why Battery Energy Storage Systems (BESS)?

As the integration of renewable energy increases, the importance of effectively managing its intermittent nature becomes increasingly evident.

Battery energy storage systems enable us to stabilise the flow of electricity from renewable sources, ensuring optimal utilisation of the grid network. They are the linchpin of a sustainable energy system as they can swiftly adapt to fluctuations in supply and demand.

Want to learn more? Our animation showcases everything you need to know about BESS.

By working with Harmony Energy you can explore the suitability of your land and the potential income. Let’s collaborate to advance the green energy landscape together. To find out more, explore our FAQs.

Case Study

Developed by Harmony Energy and owned by Harmony Energy Income Trust, the multi-award winning Pillswood battery energy storage system, was Europe’s largest by MWh at the time of launch.

Read Case Study

Battery Projects

  • Under Construction
  • Operational


Why battery energy storage?

Battery energy storage is key to unlocking the full potential of renewable technologies, such as solar and wind power. It empowers us to store excess electricity and release it when the Grid requires it most which stabilises the frequency the Grid has to operate in. Essentially, batteries serve as reservoirs of energy, enabling us to optimise the grid and accommodate more renewable energy sources.

For instance, on a windy night when energy demand is low, the National Grid may instruct some wind farms to shut down. Instead of allowing these turbines to cease generation, batteries step in to capture that surplus green energy and rapidly charge our batteries, taking them from empty to full within just two hours. Subsequently, we can discharge this stored power at a later date during peak usage hours when people return home from work and utilise their appliances. This seamless process enhances grid reliability and maximises renewable resources.

Are batteries safe?

Batteries are a safe technology. They are rigorously fire-tested against international safety standards. We only use reputable suppliers that have been tried and tested for a long time in the utility-scale battery energy storage space.

All our batteries are insured.

What criteria do you apply to site selection for battery energy storage systems?

We need land close to the national grid or a local distribution network connection point. The further away from the connection point, the less efficient it becomes due to installation costs and transmission losses.

Once we have identified a grid connection point, we conduct a detailed analysis of the surrounding land to identify sites with the lowest possible impact on built and cultural heritage, ecology and the landscape.

Would there be increased traffic to the neighbourhood?

Through the construction phase, there will be a temporary, but small, increase of construction traffic to bring the key deliveries to site to undertake the work. Following that, traffic impact will be minimal, with a couple of light vehicles managing and maintaining each site a month. All traffic during the construction period is considered thoroughly in the planning submission, with local highways consulted.

Are there any increased flood risks?

No, we always undertake an Environmental Impact Assessment as part of our application, which will identify any special measures required to mitigate the impact.

Do we engage with local stakeholders?

We look to engage with local communities as soon as possible. That includes councillors, politicians, parish councils, and other key community groups in the area. We undertake an extensive public consultation or engagement programme where we seek to get everyone’s views for them to shape and support the development where possible.