We offer advice to companies who are planning developments using Battery Energy Storage System - BESS in the county.
With multiple renewable energy developments being planned across the country, it’s important that best practice is followed to reduce the risk of fires.
National guidance is available for developers from the National Fire Chief’s Council. They advise that safety measures and risk mitigation are developed in collaboration with us.
We will work with developers in the renewable industries to better understand any risks and develop procedures to mitigate these risks.
How to minimise the risk of fire
Developers must ensure the risk of fire is minimised.
Legislation
Developers must use components and construction techniques which comply with all relevant legislation.
Fire detection
Developers must include Automatic Fire Detection systems in the development design. Including automatic fire suppression systems.
Various types of suppression systems are available, but our preferred system would be a water misting system as fires involving Lithium-ion batteries have the potential for thermal runaway.
Other systems would be less effective in preventing re-ignition.
Design
To include redundancy in the design to provide multiple layers of protection.
Designing the development to contain and restrict the spread of fire using fire-resistant materials, and adequate separation between elements of the Battery Energy Storage System.
Location
Ensuring the BESS is located with due considerations of impact on communities, sites and infrastructure.
Prevailing wind directions should be factored into the location of the BESS to minimise the impact of a fire involving lithium-ion batteries due to the toxic fumes produced.
Emergency response plan
Develop an emergency response plan with us to minimise the impact of an incident during construction, operation and decommissioning of the facility.
The emergency response plan should include:
- details of the hazards associated with lithium-ion batteries
- isolation of electrical sources to enable fire-fighting activities
- measures to extinguish or cool batteries involved in fire
- management of toxic or flammable gases
- minimise the environmental impact of an incident
- containment of fire water run-off
- handling and responsibility for disposal of damaged batteries
- establishment of regular onsite training exercises
The emergency response plan should be maintained and regularly reviewed by the occupier and any material changes notified to us.
Environmental impact should include the prevention of ground contamination, water course pollution, and the release of toxic gases.
BESS facilities design
The BESS facilities should be designed to provide adequate separation between containers. As well as provide adequate thermal barriers between switch gear and batteries,
Ventilation
Install adequate ventilation or an air conditioning system to control the temperature.
Ventilation is important since batteries will continue to generate flammable gas if they are hot. Also, carbon monoxide will be generated until the batteries are completely cooled through to their core.
Detectors
Install a very early warning fire detection system, such as aspirating smoke detection/air sampling. As well as Carbon Monoxide detection within the BESS containers.
Install sprinkler protection within BESS containers. The sprinkler system should be designed to adequately contain and extinguish a fire.
Water
Ensure that sufficient water is available for manual firefighting.
An external fire hydrant should be in close proximity of the BESS containers.
The water supply should be able to provide a minimum of 1,900 l/min for at least 120 minutes - 2 hours. Further hydrants should be strategically located across the development.
These should be tested and serviced at regular intervals by the operator. If the site is remote from a pressure fed water supply, then an Emergency Water Supply meeting the above standard should be incorporated into the design of the site e.g. an open water source and/or tanks.
If above ground EWS tanks are installed, these should include facilities for the FRS to discharge 140/100mm RT outlet and refill the tank.
Access
The site design should include a safe access route for fire appliances to manoeuvre within the site, including turning circles.
An alternative access point and approach route should be provided and maintained to enable appliances to approach from an up-wind direction.
Information Box
As the majority of BESS are remotely monitored, consideration should include the fixing of an Information Box IB at the FRS access point.
The purpose of the IB is to provide information for first responders e.g., Emergency Response Plan, to include water supplies for firefighting, drainage plans highlighting any Pollution Control Devices PCDs / Penstocks etc for the FRS.
National Fire Protection Association
We are aware that large scale BESS is a fairly new technology, and as such risks may or may not be captured in current guidance in pursuance of the Building Regulations (as amended) and the Regulatory Reform Fire Safety Order 2005.
This will highlight challenges we have when responding to Building Regulations consultations.
For this reason, we strongly recommend applying the National Fire Protection Association NFPA 855 Standard for the Installation of Stationary Energy Storage Systems along with guidance from the NFCC Grid Scale Battery Energy Storage System Planning.