| Civil Works: Dam completed. All 08 Nos. HRTs completed including plugging of Adits. Roofing and associated works in Power House completed up to Unit-6 and the same is in progress in remaining units.
HM Works: All HM works completed
E&M works: Unit-1, Unit-2 & Unit-3: Dry commissioning completed. Unit-4: Stator assembly - 90% completed. Rotor: Rotor assembly - 82% completed. Erection of Turbine and MIV Works in progress. Unit-5: Assembly of Stator and erection of MIV are in progress. Unit- 6: Erection of Spiral casing is in progress. Unit- 7: Pre-assembly of spiral case strakes at store is in progress. Unit- 8: Erection of Draft Tube and lower pit liner (lower part) completed.
The team constituted by National Dam Safety Authority (NDSA) for inspection of Dam of Subansiri Lower HE Project for initial filling of the reservoir visited the project from 10.04.2025 to 12.04.2025 and raised some observations vide their e-mail dated: 21.04.2025. NHPC has submitted its reply on 25.04.2025. NDSA again raised few observations vide their letter dated: 09.05.2025. NHPC has submitted its reply on 22.05.2025. Initial reservoir filling shall be done after clearance from NDSA.
| Dam Works: Dam top of EL 210 m has been achieved in all blocks on 29.06.2023. Cumulative concreting of 2047378 cum has been done out of 2050465 cum (99.85 percent achieved).
Power House Civil Package works: 15017 cum concrete placed in power house (including underground works) during Mar’24 and cumulative qty. 1319639 cum achieved out of 1467867 cum. HRT Overt and Invert Lining (7102 m) completed. 166.41 m Overt lining completed in Surge Tunnel during Mar’24 and total quantity of 3221 m completed out of 3545 m (90.86%).
E&M Works: Unit-1: Boxing up completed and pre-commissioning activities are under progress. Erection of MIV and erection of GSU transformer is completed. Unit-2: Boxing up is under progress. Erection of GSU transformer is completed. Erection of MIV is completed. Unit-3: Assembly of Rotor completed and erection of Stator is in progress. Erection of spiral casing is completed. Works in remaining Units are under progress.
HM Works: Testing and commissioning of all 08 nos. Intake Service Gates have been completed. Fabrication of ferrule and erection work of Penstock Liner is in progress (98.24 % completed).
Radial Gates: S#1: Gate is commissioned. S#2 & S#3: Gate is structurally functional. Installation of rubber seal is balance. S#4: Except 3 Trunnions all other works are balance. S#5: 84% completed. 3 Nos. skin plates and 1 No. Arm are balance. S#6: Except 4 Trunnions all other works are balance. S#7: All the 12 Nos. skin plates are erected and the welding works are in progress. Fixing of Rubber Seals is in progress. S#8: Gate is structurally functional. Fixing of Rubber Seals is in progress. S#9: All the 12 Nos. skin plates are erected and the welding works are in progress. Fixing of Rubber Seals is in progress.
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