Today, 70 years ago, on December 27, 1955 (November 14, 1955) the office hydroelectric power plant began to generate electricity. On December 27, 1955, the first self-designed, built, and built hydroelectric power plant in Beijing, the office hydroelectric power plant was built to generate electricity. This hydroelectric power plant began to be built in April 1954, and was built three months earlier than originally planned. It relied mainly on the energy storage of water of the office water tank of 22,7 million cubic meters as power to generate electricity, which can generate electricity annually equivalent to more than 100,000 tons of coal. The entire hydroelectric power plant project consists of water tunnel, hole pressure well, main factory, central control room, can automatically control the tunnel water import volume.