Battery Energy Storage Systems (BESS)

Battery Energy Storage Systems (BESS) work by storing electrical energy produced by renewable sources like solar panels. This stored energy can be released when required, either for customer use or to be fed back into the supply grid.

A key component within a BESS is a series of battery cells that are predominantly lithium-ion. In normal circumstances, these battery cells work as intended with no issues. However, in certain situations, battery cell failure can significantly increase the risk of fire.

Careful consideration should be given to the location of BESS during the very early stages of planning to minimise damage to your assets in the event of a fire.

For example, BESS systems should NOT be installed in the following areas:

• In any room used for sleeping or living accommodation
• On any means of escape routes, such as hallways, corridors, or staircase enclosures
• Within any service lifts or risers
• In storage cupboards of combustible construction and/or containing any combustible items
• Within roof voids, loft spaces or other similar concealed spaces
• Within basements or cellars, unless they contain external access and in a separate fire compartment from the rest of the accommodation
• On any combustible wall linings/structures.

Appropriate and proportionate controls will help manage the potential fire risks BESS present.

You must inform your insurers if you plan to install a BESS at your premises. Ecclesiastical customers can complete our questionnaire at the design stage and submit this to us for review if you are considering installing BESS.

For more information on BESS, we have developed specific Battery Energy Storage Systems guidance below.