What unit in Jinan uses high-voltage electrician certificate?

Power supply bureau needs high-voltage electrician certificate and low-voltage electrician certificate to work. Because the power supply bureau staff not only have to work under high pressure, but also under low pressure, and the technical requirements are high. The employees in the power supply bureau are well paid. Although the work is hard, the income is still good, especially for the outside staff, and there are high subsidies. So the work of power supply bureau is envied by many people.