Pallatana-Bongaigaon Transmission System

2 Generation Project Summary  Pallatana (726.6 MW): being implemented by OTPC –Unit - 1 : Dec-2011 –Unit - 2 : March-2012  Bongaigaon (750 MW): being implemented by NTPC –Unit - 1 : July-2012  Beneficiaries –Constituents of North Eastern Region

3 Pallatana - Bongaigaon Transmission System  Trans. System Under NETC (JV of OTPC, PG & NER States) –Pallatana – Silchar – Bongaigaon 400kV D/c line  Trans. System (Under POWERGRID) –BTPS - Bongaigaon 400kV D/c line –Silchar – Badarpur(PG) Sw. Stn. interconnecting 132kV D/c line –Silchar – Srikona 132kV D/c –Silchar – Hailakandi 132kV D/c –Pallatana - Surajmaninagar 400kV D/c line (charged at 132kV) –Silchar – P. K. Bari (TSECL) 400kV D/c line (charged at 132kV) –Silchar – Melriat (New) 400kV D/c line (charged at 132kV) –Melriat (New) – Melriat(Mizoram) interconnecting 132kV D/c line –Silchar - Imphal(New) 400kV D/c line (charged at 132kV) –LILO of Loktak- Imphal(PG) 132kV S/c line at Imphal(New) –LILO of Kathalguri-Misa 400kV (op. at 220kV) S/c at New Mariani

4 Pallatana - Bongaigaon Transmission System  Trans. System (Under POWERGRID -Contd.) –Mariani(new)-Mokokchung (PG) 220kV D/c line –Mokokchung (PG)-Mokokchung (Naga) 132kV D/c (Zebra cond.) –Pasighat – Roing 132kV S/c line (on D/c tower) –Roing – Tezu 132kV S/c line (on D/c tower) –Tezu – Namsai 132kV S/c line (on D/c tower) –2x200MVA, 400/132kV New S/s at Silchar –2x50MVA, 132/33kV New S/s at Melriat New (upgradable to 400kV) –2x50MVA, 132/33kV New S/s at Imphal New (upgradable to 400kV) –220kV New Switching S/s at Mariani –2x50MVA, 220/132kV New S/s at Mokokchung –2x15 MVA, 132/33kV New S/s at Roing –2x15 MVA, 132/33kV New S/s at Tezu –2x15 MVA, 132/33kV New S/s at Namsai

5 Pallatana - Bongaigaon Transmission System (under scope of other agencies)  NTPC –400/220kV, 2x315MVA transformers at BTPS (NTPC) switchyard –220kV Connectivity between NTPC and AEGCL switchyard –2 nos. of 400kV line bays for BTPS – Bongaigaon 400kV D/c line  OTPC –400/132kV, 2x100MVA transformers at Pallatana switchyard –2 nos. of 400kV line bays for Pallatana-Silchar 400kV D/c line –2 nos. 132kV line bays for Pallatana-Surajmaninagar 132kV D/c (upgrad. to 400kV) –50MVAR line reactor in each ckt of Pallatana-Silchar 400kV D/c line at Pallatana end –80MVAR bus reactor at Pallatana Generation Switchyard.  Assam –2x315MVA, 400/220kV New Substation at Azara –LILO of Silchar-Bongaigaon 400kV D/c line at Azara –LILO of Agia-Guwahati 220kV D/c line at Azara –63MVAR line reactor in Silchar-Azara 400kV line at Azara end –63MVAR bus reactor at Azara  Meghalaya –LILO of one ckt of Silchar-Bongaigaon 400kV D/c line at Byrnihat –2x315MVA, 400/220kV New Substation at Byrnihat –50MVAR line reactor in Silchar-Byrnihat 400kV line at Byrnihat end –63MVAR bus reactor at Byrnihat  Tripura –2x50MVA, 132/33kV substation at Surajmaninagar (upgradable to 400kV) –Monarchak – Surajmaninagar 132kV D/c –Monarchak – Rabindranagar 132kV D/c –Surajmaninagar – P. K. Bari 400kV D/c to be charged at 132kV –132kV S/s at Rabindranagar

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8 Minimum Trans. System required with 1 st unit of Pallatana  Trans. System Under NETC (JV of OTPC, PG & NER States) –Pallatana - Silchar 400kV D/c line  Trans. System (Under POWERGRID) –Pallatana - Silchar 400kV D/c line –2x200 MVA, 400/132kV new S/s at Silchar –Silchar - Badarpur(PG) 132kV D/c line –Silchar - Srikona (Assam) 132kV D/c line –Silchar - Hailakandi(Assam) 132kV D/c line with LILO of Panchgram-Dullabhchera 132kV S/c line of AEGCL to connected it with Silchar-Hailakandi 132kV D/c line so as to form Silchar - Panchgram and Pallatana - Silchar 132kV lines (as agreed in NERPC)

9 Trans. System likely to be commissioned with 2 nd unit of Pallatana (scheduled in March-2012)  Trans. System Under NETC (JV of OTPC, PG & NER States) –Silchar - Bongaigaon 400kV D/c line  Trans. System (Under POWERGRID) –Pallatana - Surajmaninagar 400kV D/c line (to be operated at 132kV) –Surajmaninagar – P. K. Bari 400kV D/c to be charged at 132kV  Trans. System (Under OTPC) –2x100 MVA, 400/132kV ICT at Pallatana  Trans. System (Under Tripura Scope) –2x50MVA, 132/33kV substation at Surajmaninagar (upgradable to 400kV)  Trans. System (Under Meghalaya Scope) –2x315MVA, 400/220kV substation at Byrnihat alongwith LILO of one ckt. of Silchar – Bongaigaon 400kV D/c line Note : In absence of Byrnihat S/s, upto 500 MW can be evacuated through Silchar (2x200 MVA) and Pallatana (2x100 MVA) ICTs

10 Major Concerns  Construction of new S/s at Surajmaninagar (Tripura) –Pallatana – Surajmaninagar 132kV D/c being constructed by POWERGRID to provide alternate path for evacuation as well as anticipated to be used for start-up power –New 2x50 MVA, 132/33kV S/s at Surajmaninagar required for termination of Pallatana – Surajmaninagar 132kV D/c –Awarded by Tripura, needs to be expedited.  Construction of new 400kV S/s at Byrnihat (Meghalaya) –2x315 MVA, 400/220kV S/s at Byrnihat to established by LILO of one circuit of Silchar – Bongaigaon 400kV D/c line –Critical for smooth operation of 408 kms long Silchar – Bongaigaon 400kV section –MeSEB signed agreement with POWERGRID for construction of Byrnihat S/s as consultancy works –Scheduled to be completed in months provided all formalities like release of payment, hand over of land etc. are completed at the earliest, which are still awaited

11 Major Concerns  Construction of new 400kV S/s at Azara (Assam) –2x315 MVA, 400/220kV S/s at Azara to established by LILO of Silchar - Bongaigaon 400kV D/c line –Critical for smooth operation of 408 kms long Silchar – Bongaigaon 400kV section –Activities for construction yet to be started by Assam  Strengthening beyond Bongaigaon –NER may have surplus during off-peak period (even though entire power from Pallatana & Bongaigaon have been allocated to NER states –Strengthening beyond Bongaigaon needs to be implemented promptly for reliable transfer of power –POWERGRID is implementing re-conductoring of Siliguri- Purnea 400kV D/c line, expected to be completed by March, 2012 –Bongaigaon – Siliguri & Purnea – Biharsharif 400kV D/c lines are being implemented under private sector and have been awarded to M/s Sterlite. Implementation of the same needs to be expedited

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