Meeting a building’s maximum demand requirements versus the energy availability is becoming a challenging proposition. Issues such increased EV charging installations and closure of grid coal powered generators are contributing to this challenge. Through the application of BESS, a building’s peak energy demand can be reduced as well as its energy costs. This reduction is achieved by storing energy into the BESS when the daily grid energy cost is low (availability is high), and then discharging the BESS to the load when the grid energy is expensive (availability is low). In addition, BESS can increase the property’s energy resilience and reduces its reliance on back-up diesel generators. BESS can be supplied via large shipping containers through to small portable trailers.