Abstract: An electric grid comprising a first section comprising transmission equipment, power generation equipment, and electric transmission lines designed to serve an electric load within the first section independently of a second section, wherein the second section comprises the remaining electric grid excluding the first section. The system includes at least two electric connections between the first and second sections of the electric grid and a control system controlling operation of the first section independently of the second section. The first section comprises at least two of power generation, electricity storage, demand response, transmission equipment and electric loads within the first section and controls capable of balancing loads within the first section and controlling disconnection and reconnection with the second section via the electric connections. The first section synchronized in frequency and phase with the electric grid when power is restored to the electric grid.