What do power transmission and transformation companies and power plants do?

Power plants generate electricity and transmit it to the power grid. After entering, most of them are engaged in operations and night shifts. A few are engaged in maintenance work. Power transmission and transformation companies are responsible for the construction of overhead lines and substations, and most of the time they work in other places, which is relatively difficult. The property management company is responsible for the maintenance of houses and buildings in an area, and the communication automation company is responsible for the management of carrier, wireless and remote communication of the power grid.