The underground garage is used for property electricity, not the national grid.

Usually, the power supply for underground garages is provided by the property company itself, which may include using self-provided generators or obtaining electricity from the State Grid. The specific situation may be different, depending on the specific situation of different power suppliers and property management companies.

If the underground garage is not connected to the power supply line of the national grid, it may be determined by the design and purpose of the underground garage. The underground garage may only need a small power load, so it may be enough to use your own generator or buy electricity from a small local power supplier.

In addition, property companies may want to control the power supply of underground garages more finely, such as using generators to avoid noise and exhaust emissions. In this case, using the power supply of the national grid may not be the best choice.

Generally speaking, the power supply of underground garage may have nothing to do with the national grid for various reasons, and the specific situation needs to be evaluated according to the actual situation.