Transmission System of WAPDA links lower generating stations and load centers of the entire country creating one of the world's largest contiguous grid system. The national grid, connecting hydel generation in the north and thermal generation in mid country and the south, consists of a large net work of transmission lines and grid stations of voltage levels from 500kV to 33kV to transmit Power to load centers throughout the country to serve over ten (10) million consumers of various categories.

National Transmission & Dispatch Company (NTDC) carries out design, maintenance and operation of a network of secondary transmission lines and grid station throughout the country. This system consists of 44030 Circuit km. of transmission lines (including 500kV, 132kV and 66kV) and 615 Nos. of grid station from 500kV down to 66kV level.

In order to disperse the available power in the load centers and from the private generation projects it has become imperative to develop secondary transmission and grid system. A comprehensive project in this connection has been planned and named as 5th Secondary Transmission & Grid Station (STG) Project. This project envisages installation of new secondary transmission facilities comprising of 220kV , 132kV & 66kV transmission lines and grid station as well as strengthening of the existing system through additions, augmentation and up-grading.

SCOPE OF WORKS UNDER 5TH STG PROJECT

SCHEDULE

• Original		1992-93 to 1997-98
• Revised		1994-95 to 2000-2001

a] GRID STATION

220KV 132KV 66KV TOTAL • New 13 163 15 191 • Extensions 25 282 61 368 • Augmentation 1 82 38 121 • Conversions (from 66kV to 132kV) - 51 - 51 Total = 39 578 114 731

b] TRANSMISSION LINES

Circuit Lenth (km.) • 220kV 3070 • 132kV 6773 • 66kV 796 Total = 10639

WORKS COMMISSIONED
As on 30/06/2000

a] GRID STATION

220KV 132KV 66KV TOTAL • New 6 27 4 37 • Extensions 13 95 27 135 • Augmentation 1 48 26 75 • Conversions (from 66kV to 132kV) - 10 - 10 Total = 20 180 57 257

b] TRANSMISSION LINES

Circuit Lenth (km.) • 220kV 1853 • 132kV 2056 • 66kV 190 Total = 4099

WORKS IN HAND
ADP List For Financial Years 2000-2001

a] GRID STATION

220KV 132KV 66KV TOTAL • New 7 33 4 44 • Extensions 17 60 7 84 • Augmentation - 30 9 39 • Conversions (from 66kV to 132kV) - 4 - 4 Total = 24 127 20 171

b] TRANSMISSION LINES

Circuit Lenth (km.) • 220kV 957 • 132kV 2150 • 66kV 138 Total = 3245

BALANCE WORKS TO BE COMPLETED
Under 5th STG. Project

a] GRID STATION

220KV 132KV 66KV TOTAL • New - 103 7 110 • Extensions - 127 27 154 • Augmentation - 4 3 7 • Conversions (from 66kV to 132kV) - 37 - 37 Total = 271 37 308