Compliance with design requirements for vessels where the EES (Electrica Energy Storage) power is used for electrical propulsion of the vessel.
Hybrid vessel where one of the main sources of power is based on EES.
Hybrid vessel having an operational mode where the vessel is operatingon EES power only, withthe other main source ofpower in standby
Hybrid vessel usingthe EES system as are dundant source of power for main and/or additional class notations, e.g. dynamic positioning.