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The following is a short overview of some of the main interconnected systems

• Union for the Cooperation of Production and Transmission of Electricity (UCPTE), which includes the electric utilities in the western European countries involving about 14% of the world installed capacity and covers an area of about 2.28 million km².
  
  
• The interconnected Power System (IPS)/(CMEA), including the power systems of the eastern European countries, involving about 5% of the world installed capacity and covers an area of about 1.25 million km².
  
  
• The United Power System (UPS), Including the power systems of the CIS countries with about 15% of the world installed capacity and covers an area of the about 11.25 million km². The UPS system is synchronously operated with the (IPS)/(CMEA) system under normal operating conditions.
  
  
• Nordic Countries Interconnection (NORDEL), which includes the electric the electric utilities in Scandinavian countries. involving 2.8% of the world installed capacity and covers an area of about 1.23 million km². NORDEL system is connected with UCPTE and UPS systems via d.c. links.
  
  
• The continent of North America includes two main interconnected systems, each of them operates synchronously. The Eastern System including the east of the United States and the central provinces of Canada. The Western System including west of the United States and western provinces of Canada. Both systems involve 29% of the world installed capacity and cover about 8.26 million km²

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