Top 10 Transmission System Operators in the World in 2021 by Total Length

State Grid Corporation of China, China Southern Power Grid Co Ltd, Xcel Energy Inc, Power Grid Corporation of India Ltd, and Federal Grid Company of Unified Energy System PJSC are the top 5 transmission system operators in the world in 2021 by total length. Comprehensively, the top 10 transmission system operators in the world had a total length of 2,473,001CKm, where State Grid Corporation of China was the highest (1,142,000CKm), followed by China Southern Power Grid Co Ltd (248,532CKm), and Xcel Energy Inc (177,596CKm), while Midcontinent Independent System Operator Inc was the lowest (105,895CKm). In terms of the geographical split, 4 out of 10 of the world's top transmission system operators are based in Asia, while 5 are based in the Americas, and the remaining companies are based in Europe. The China-based State Grid Corporation of China is the leading transmission system operator in the world by total length. The company reported revenues of $385,504 million for the fiscal year ended December 2021 (FY2021). The company’s core business includes the construction and operation of power grids. It focuses on research and development of ultra-high voltage (UHV) transmission and smart grid technologies. SGCC owns proprietary intellectual property rights and promotes the export of technology and related equipment. It also operates large-scale commercial UHV projects. SGCC supplies power to municipalities, provinces, and autonomous regions, servicing most of the territory in China. It employs 1,520,000 people. Tavanir is another leading transmission system operator in the world by total length. Tavanir is a government-owned integrated energy utility. The company operates under the Ministry of Energy (MoE) of Iran. The company's holding structure includes 16 regional electric companies, 42 distribution companies, and 27 generation management companies. It is entrusted with several responsibilities including the preparation of necessary proposals such as strategies, policies, short- and long-term planning of the domestic electricity market, and coordination with the MoE.