The project includes the following transmission lines:

  1. 400kV D/C Palatana-Silchar Twin Moose Conductor Transmission Line - 247.39 Kms
  2. 400kV D/C Silchar-Byrnihat (one circuit on D/C towers) Twin Moose Conductor Transmission Line- 214.41 Kms
  3. 400kV D/C Byrnihat-Bongaigaon (one circuit on D/C towers) Twin Moose Conductor Transmission Line- 201 Km
  4. 400kV D/C Silchar-Azara (one circuit on D/C towers) Twin Moose Conductor Transmission Line- 256.41 Km, and
  5. 400kV D/C Azara-Bongaigaon (one circuit on D/C towers) Twin Moose Conductor Transmission Line- 159 Km

The date of commissioning of the transmission lines are as follows:

  1. Palatana-Silchar Transmission Line-01.09.2012
  2. Silchar-Byrnihat Transmission Line-01.03.2013\
  3. Byrnihat-Bongaigaon Transmission Line-22.02.2015 
  4. Silchar-Azara Transmission Line- 27.07.2014
  5. Azara-Bongaigaon Transmission Line- 16.01.2015

Salient Feature of Line and Topography

The 400 KV D/C interstate transmission line between Pallatana and Bongaigaon via Silchar has a route length of 662.2 kms and passes through Hilly terrain(300 kms approx..), reserve forest (124 kms) and cultivated lands in the states of Tripura, Meghalaya and Assam.

Forest Details

The transmission line traverses through dense forest in the three states of Tripura, Meghalaya and Assam involving approximately 124 Km of line length out of the total 663 Kms (approximately). i.e. 18.7%. The forest involvement in states of Tripura, Meghalaya and Assam was as under:

STATE

Line Length (kms)

Forest Area in(ha)

 Forest Length in (kms)

Total tower locations

Tower Locations in Forest

     

Tripura

172

334.03

72.62

470

207

     
     

Meghalaya

182

114.015

24.786

499 

40

     
     

Assam

308

120.59

26.219

 862

83

     
     

Total

663

568.635

123.625

1831

330

     
     
                 

Major River Details

The transmission line also crosses major rivers, viz, Brahamputra, Barak and Champabati. 2 nos. well foundations and 1 no. pile foundation were constructed in midstream of Brahmaputra River. The maximum height of tower erected in Brahamputra river crossing is 138 metres(329,32 MT). For Barak river, 4.5 metre deep foundations were cast on the river banks and with the use of tall towers (122 metre, 210 MT per tower ) river was crossed. At Champavati river 1 no. pile foundation was cast to cross the river.