Transmission *3 Contents Page Number MISSION 4 VISION 5 HISTORICAL BACKGROUND 6 TRANSMISSION TODAY 8 Object Technical Characteristics of the Transmission System Map of the Hellenic Transmission System Installed Equipment International Interconnections Transmission System Development Transmission System Maintenance RELATIONS WITH RAE, HTSO 20 Responsibilities Charges for the Use of the Transmission System Connection of new producers/consumers Interconnections Management ORGANIZATIONAL STRUCTURE 23 ACTIVITIES OF TRANSMISSION DIVISION DEPARTMENTS 24 HUMAN RESOURCES 27 ENVIRONMENTAL CARE 28 STRATEGIC GOALS AND PERSPECTIVES 30 | PUBLIC POWER CORPORATION S.A. | TRANSMISSION DIVISION | *4 Mission he Transmission Division (T/DI) is the owner of the National T Interconnected Transmission System through which the Hellenic Transmission System Operator (HTSO) transmits via high voltage power lines the electricity generated by power plants (owned by PPC or by independent power producers), as well as from the points of interconnection with neighboring countries, to the distribution network and to high-voltage customers. In accordance with article 12 of Law 2773/1999, the owner of the System is PPC S.A., while HTSO is responsible for its operation and the planning of maintenance and development, as well as for the third-party access to the System. The Transmission Division is responsible for the engineering, construction and commissioning of new Transmission projects, as well as for the physical operation and maintenance of the National Interconnected Transmission System, according to HTSO schedule and guidelines. | PUBLIC POWER CORPORATION S.A. | TRANSMISSION DIVISION | *5 Vision ▲ Ensures the equipment reliable operation, to the benefit of PPC S.A., of the users and producers connected to the System, as well of international interconnections, within the framework of the electricity market liberalization. ▲▲ Implements the development of the System with respect for the environment, while ensuring the maximum possible social acceptance. Exploits and further develops the know-how in the field of electric power transmission systems and equipment, aiming at maintaining the leading position in the Hellenic market. | PUBLIC POWER CORPORATION S.A. | TRANSMISSION DIVISION | *7 Historical Background 1953 Commencement of Transmission System development in Continental Greece with initial installed capacity 212.5 MVA and 326 km of 150 kV High Voltage Transmission Lines. 1968 The Transmission System of Crete was put into operation. Furthermore, the first Submarine interconnections of 150 kV (Kalamos – Amarynthos) & 66 kV (Igoumenitsa – Corfu) came into operation. 1972 Installation of the first 150 kV SF6-technology circuit breakers. 1973 The 400 kV Transmission System was put into operation in the Continental Greece. 1975 The 66 kV Transmission System of Rhodes was first put into operation. 1977 The first closed-type 150 kV Gas Insulated Switchgear Substation was put into operation in the region of N. Elvetia, Thessaloniki. 1995 Inauguration of the new National Center for Energy control and monitoring and of the South Regional Control Center in Aghios Stefanos, Attica, as well as of the North Regional Control Centre in the Ptolemais Region. | PUBLIC POWER CORPORATION S.A. | TRANSMISSION DIVISION | *8 9 HISTORICAL BACKGROUND * Installation of the first XLPE 150 kV insulated cable in the Extra-High Voltage Substations of Aghios Stefanos and Thessaloniki. 1998 The first closed-type 400 kV Gas Insulated Switchgear Substation came into operation in Lavrion. 1999 The Ztacir conductor was first put into operation in the Transmission Line connecting the Extra-High Voltage Substation of Thessaloniki and Moudania Substation. Law 2773/1999 on the liberalization of the electricity market entered in force, enabling for the establishment of the Regulatory Authority of Energy (RAE) and the Hellenic Transmission System Operator (HTSO) and designating PPC as the owner of the Transmission System. The Energy Control Centers and all activities on System Development Studies were separated from the Transmission Division and were integrated into HTSO activities. 2001 The Transmission Networks of Crete and Rhodes were separated from the Transmission Division and come under the Distribution Division, according to Law 2773/99. The first 150 KV compact switchgear module was put into operation at the Komotini Substation. 2002 The first HVDC interconnection, which connects the Electricity Systems of Greece and Italy through submarine and overhead Transmission Lines, was put into operation. 2003 The first air-insulated 150/20 kV Substation with an integrated automated substation system was put into operation on the island of Lefkada. 2004 The first 150 kV capacitors with controlled switching were installed at the Extra-High Voltage Substations of Aghios Stefanos, Pallini, and Acharnai. | PUBLIC POWER CORPORATION S.A. | TRANSMISSION DIVISION | *11 Transmission today Object fter the liberalization of the Greek electricity market, as A stipulated by Law 2773/99, PPC remains a vertically integrated company, whereas the Transmission Division remains the owner of the Transmission System. Furthermore, the Transmission Division undertakes the System physical operation, maintenance and development, according to HTSO planning, as well as the development of the autonomous Transmission Systems on the islands. At the same time, the Transmission Division is responsible for the installation and maintenance of an optical fiber network laid on the existing transmission lines, within the framework of the creation of a telecommunications infrastructure for TELLAS, a telecommunications company which was established as a joint venture of PPC and WIND. Technical Characteristics of the Transmission System he backbone of the National Interconnected Transmission T System consists of three, double-circuit 400 kV lines, which transmit electricity from Northern Greece power plants, where about 65% to 70% of PPC electricity in Continental Greece is generated, to the main consumption centers in Central and Southern Greece, where about 65% to 70% of electricity is consumed. The National Interconnected Transmission System consists of 400 kV and 150 kV lines, as well as of 66 kV and 150 kV submarine cables, which interconnect the biggest Ionian Islands and the island of Salamina. Submarine cables of 150 kV have also been installed in the regions of Evia and the Peloponese, whereas submarine interconnections expand towards the Cyclades islands. In particular, the island of Andros was integrated into the Interconnected System in the summer of 2003. The following map represents the 400 kV Transmission Lines of the Interconnected Transmission System as of December 31, 2006. | PUBLIC POWER CORPORATION S.A. | TRANSMISSION DIVISION | *12 MAP OF THE HELLENIC TRANSMISSION SYSTEM Hellenic Transmission System 400kV, Year 2006 MEMORANDUM B’B’ 400KV Line of single circuit B’B’, single conductor of heavy type 2B’B’ 400KV Line of duble circuit 2B’B’, duble conductor of heavy type B’B’B’ 400KV Line of single circuit B’B’B’, triple conductor of heavy type Under Construction D9: New interconnector Fillipi - Babaeski The Cross-Sections of all the above conductors are 954 MCM per conductor 400 KV DC Transmission lines & cables Under Construction SUBSTATION 400KV UNDER CONSTRUCTION THERMAL STATION HYDROELECTRIC STATION *13 14 * TRANSMISSION TODAY Installed Equipment he installations of the Interconnected Transmission System T include Transmission Lines of 10,749 km, as shown in the table below. TRANSMISSION LINES (*) OF THE INTERCONNECTED TRANSMISSION SYSTEM (km.) 400kV/DC 400kV/AC 150kV 66kV Total Overhead 107 2,309 7,962 39 10,417 Submarine 160 123 15 298 Underground 529 34 Total 267 2,314 8,114 54 10,749 (*) as of December 31st 2006 The flowchart below represents the evolution of the Overhead Transmission Lines routing length, for voltages of 150 kV and 400 kV, during the period 1986-2006 (the routing length of 66 kV voltage lines remains the same, which is 39 km). Evolution of the Routing Length of Overhead Transmission Lines (km.) 7.962 6.410 150 kV 400 kV 2.416 1.319 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 | PUBLIC POWER CORPORATION S.A. | TRANSMISSION DIVISION | 15 TRANSMISSION TODAY * On December 31st 2006, the Transmission System counted 538 transformers and autotransformers of total installed capacity amounting to 42,277 MVA. The Table below presents the features of the high voltage transformers installed in the Interconnected Transmission System. POWER TRANSFORMERS (*) OF THE INTERCONNECTED TRANSMISSION SYSTEM kV MVA Number 400 5,408 17 Step-up (1) 150 7,489 66 20 7 2 Step-down (2) 150 16,041 384 Step-down & Auxiliary Transformers (1) 150 815 18 Autotransformers 400/150 11,840 44 Transformers / Converters 400 597 3 66/20 25 1 Step-down (3) 66/15 50 2 20/15 5 1 Total 42,277 538 (*) on December 31st 2006 (1) (1) Under the responsibility of the Generation Division (2) Under the responsibility of the Transmission, Distribution and Mines Divisions. (3) Under the responsibility of the Distribution Division The following flowchart represents how the installation of Transmission Substations and Power Transformers evolved during the period 1986 – 2006. Evolution of the Installation of Substations - Power Transformers to the Interconnected Transmission System (km.) Power Transformers 536 Substations 309 250 137 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 | PUBLIC POWER CORPORATION S.A. | TRANSMISSION