Systems and methods for extending black-start availability using energy storage systems can be provided. In one example implementation, a method includes detecting, by one or more controllers, a disconnection of the power system from a power grid; obtaining, by the one or more controllers, data indicative of the amount of energy present in a first energy storage system; obtaining, by the one or more controllers, data indicative of an amount of energy associated with powering one or more loads coupled to the power system; and determining, by the one or more controllers, to activate the auxiliary power source based at least in part on the amount of energy present in the first energy storage system and the amount of energy associated with powering the one or more loads.