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Legend: Explanations & Illustrations Rationale Note Figures & Tables Revision history


Effective Date: 1 June 2020

10.3.1 General

(a) Energy Storage System refers to one or more devices, assembled together, capable of storing energy in order to supply electrical energy at a future time to the local power loads, to the utility grid, or for grid support.

(b) This set of fire safety requirements need not be applicable to Energy Storage System installations where the total stored energy is less than the Threshold Stored Energy listed in Table 10.3.1 below.

(c) All Energy Storage System installations shall be located at the same storey as the fire engine accessway/fire engine access road.

(d) The allowable Maximum Stored Energy for the various battery technologies in each compartment shall be as listed in Table 10.3.1.

Type Threshold Stored Energy a
Maximum Stored Energy a
Lead-acid batteries, all types70600
Nickel batteries b70600
Lithium-ion batteries, all types 20 600
Sodium nickel chloride batteries 20 600
Flow batteries c 20 600
Other batteries technologies 10 200
a        It shall refer to an aggregated stored energy capacity per compartment. For battery rating in Amp-Hours, kWh is equal to maximum rated voltage multiplied by amp-hr rating divided by 1000.
b        Nickel battery technologies include nickel cadmium (Ni-Cad), nickel metal hydride (Ni-MH), and nickel zinc (Ni-Zn).
c        Includes vanadium, zinc-bromine, polysulfide-bromide, and other flowing electrolyte-type technologies.



10.3.2 Temporary Energy Storage System installation on construction sites

Effective Date: 1 Mar 2023

ESS installation on construction sites shall be located outdoors and comply with all the following requirements:

(a) Cl.10.3.1d. on compartmentation shall be applicable; 

(b) All ESS installations shall be located at the ground level and sited close to the boundary line adjacent to any public road or any internal driveway that is accessible by firefighting appliances. If the ESS is sited more than 100m away from the public road, a private hydrant shall be provided; 

(c) ESS installation shall be protected and locked against tampering and accidental damage by non-combustible fencing of height not less than 1.8m; 

(d) Setback distance of 3m measured between the ESS installation and the fencing shall be provided. No combustible items shall be located within this 3m separation space;

(e) Approved types of fire extinguishers of at least 2 numbers of 55A shall be provided;  

(f) An approved fire extinguishing system effective against ESS fire, shall be provided; and

(g) Ventilation requirement for ESS installation shall be in accordance with Cl.7.1.15.

Updated 25 Aug 2023