Battery Energy Storage Systems (BESS) in power systems are commonly used to support their mains when operating grid-connected, but can also increase system reliability and enhance recovery strategies in case of outages. In particular, BESS can help energize portions of the local grid in case of blackout, in a faster and more efficient manner than traditional generators. The proposed study focuses on a real application, to design and validate a suitable black start and transformers energization procedure for the local grid, to sequentially energize multiple feeders, therefore mitigating inrush currents associated to transformer energization, while avoiding triggering BESS protections and respecting utility power quality requirements for the progressively energized loads. The operational procedure was also implemented at site, where the BESS successfully energized local network.