Assessing and Mitigating Noise in BESS Projects

The Rise of Battery Energy Storage Schemes

In the pursuit of achieving net zero, the UK is witnessing a surge in renewable energy development, prompting increased investment in grid infrastructure, electricity storage solutions, and flexible grid management. This imperative for decarbonization, while ensuring security of supply, has led to the emergence of Battery Energy Storage Schemes (BESS) as an alternative solution to store and supply electrical energy from intermittent renewable sources like solar and wind.

Typical Noise Constraints of BESS Projects

BESS developments typically comprise battery storage modules, inverters, and transformers, often housed in standard shipping containers. The primary noise sources are associated with cooling units designed to dissipate the heat generated by these components. During the planning phase, each BESS project must carefully consider its noise impact on nearby residential areas, known as noise-sensitive receivers (NSRs).

BESS projects, varying in size and location, present diverse noise considerations. Rural settings may offer more space but could pose challenges due to the lack of existing ambient noise, especially during night-time. Conversely, urban locations may have higher background noise levels, but the proximity to NSRs is closer.

Planning Applications – How Do We Assess BESS?

Local Planning Authorities typically mandate a noise impact assessment according to British Standard ‘BS 4142:2014+A1:2019 – Methods for rating and assessing industrial and commercial sound.’ This assessment involves evaluating the specific sound emitted from the site at the closest NSRs and comparing it to the typical background sound level. The National Planning Policy Framework (NPPF) and the Noise Policy Statement for England (NPSE) guide the evaluation process, providing descriptors for the level of effect.

To predict noise levels at NSRs, a 3-dimensional software-generated noise model is employed. This model considers the sound power levels of BESS components during various modes of operation, utilising the ISO 9613 method for outdoor sound propagation calculations.

As BESS sites operate around the clock, noise assessments span both day and night periods.

Mitigation – When Is It Required and How?

If predicted noise levels at NSRs exceed typical background levels, mitigation measures may be necessary. Mitigation can take the form of acoustic fencing, site layout adjustments, or specifying reduction values for silencer kits. Incorporating these mitigation methods into the software modeling helps recommend the most effective approaches tailored to the site’s layout, topography, and existing noise levels.

Contact us today to learn more about how we can assist you with your Battery Energy Storage Schemes and navigate the complexities of noise impact assessments and mitigation strategies.

Read more about Noise Impact Assessment