The guidance in the circular may be applied as an alternative to relevant rules for battery systems adopted and published by a classification society recognised by the NMA.

The purpose of the circular was to make legislation that included the smaller vessels. These have now been included.

The maritime industry in Norway is at the forefront of the development and use of maritime EES systems. In cooperation with the industry, the NMA wishes to contribute to using this advantage and to further develop the technology in a safe manner.

Maritime EES systems can, depending on chemistry and design, generate significant volumes of flammable, corrosive and toxic gasses with the risk of both explosion and fire. Internal faults in the battery cells may occur regardless of the EES system's safety functions.

Electrical energy storage systems are vulnerable to external influences such as heat, sea water and mechanical damage and must therefore be sufficiently protected. Service and maintenance require highly skilled professionals, methods and equipment due to the high risk of electrical shock.