Yes it can. When the system is “on grid” where your home or business has an existing connection to the grid. The solar will work by creating as much electricity as possible. This electricity can power all the items in your home or business with any excess going back to the grid. If the solar is not producing enough electricity or it is night time your home or business will simply draw from the grid. This process is virtual and seamless so there is no physical changeover of technology. The solar and the grid synchronise together and work in harmony.