Ekibastuz–Kokshetau high-voltage line

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PSK-300A and PS-400A (U400A) disc suspension insulators used on 1150 kV powerlines in comparison with common U70BL insulator
1150 kV Powerline

The Ekibastuz–Kokshetau high-voltage line is an electrical power transmission line in Kazakhstan. It operates at 1150 kVAC which is thought to be the highest transmission line voltage in the world.

Construction started, and the line entered service during the Soviet era. Designated as power line number 1101, it runs 432 kilometres (268 mi) from Ekibastuz to Kokshetau. It is mounted on transmission towers with an average height of 60 metres (200 ft). The weight of the conductors is approximately 50,000 tons. Unlikely (115 kg/m ?)

The experimental transmission line in Beliy Rast, near Dmitrov in Moscow region, was designed as the prototype 1150 kV line, but was later disassembled.


In 1973, the Soviet Union built a three-phase UHV experimental test circuit over a kilometre long at the Beily Rast substation. In 1978, a 270 km UHV test line for industrial use was built from Sharypovo to Novokuznetsk. In 1985, this test line became part of the Ekibastuz–Kokshetau line. At the time, no other country had an operational UHV line of this voltage, although several other countries were running experiments. As of 2014, China is the only other country with an operational UHV line of 1000 kV AC or more (Liu, p. 21, 2014).


Name Coordinates
Chelyabinsk 54°59′29″N 60°40′40″E / 54.99139°N 60.67778°E / 54.99139; 60.67778 (Chelyabinsk substation)
Kostanay 53°4′37″N 63°20′46″E / 53.07694°N 63.34611°E / 53.07694; 63.34611 (Kostany substation)
Kokshetau 53°19′4″N 68°55′02″E / 53.31778°N 68.91722°E / 53.31778; 68.91722 (Kokshetau substation)
Ekibastuz 51°52′51″N 75°12′59″E / 51.88083°N 75.21639°E / 51.88083; 75.21639 (Ekibastuz substation)
Barnaul 53°34′28″N 83°40′4″E / 53.57444°N 83.66778°E / 53.57444; 83.66778 (Barnaul substation)
Sharypovo 55°26′11″N 89°04′25″E / 55.43639°N 89.07361°E / 55.43639; 89.07361 (Itatsk substation)

The line runs from Barnaul in western Siberia to Chelyabinsk just east of the Urals. Both end points are in the territory of the Russian Federation although the bulk of the line is within the borders of Kazakhstan (OECF, p. 45, 1998).


  • Research Institute of Development Assistance (Japan), Regional cooperation in central Asia : focusing on infrastructure development, The Overseas Economic Cooperation Fund, Japan, Research Papers No. 27, July 1998 OCLC 40657952.
  • Liu, Zhenya, Ultra-high Voltage AC/DC Grids, Academic Press, 2014 ISBN 0128023600.