HSE BESS guidance. New guidance from the UK Health and Safety Executive. Very high level and thin on detail. However, it is the first time I have seen “Under the Dangerous Substances (Notification and Marking of Sites) Regulations, if you are an operator of a BESS site which holds 25 tonnes or more of dangerous substances, you must notify your local fire and rescue service to inform their emergency response planning” in any BESS guidance.