NHPC Commissions Unit#4 at Subansiri Lower HE Project, Total Capacity Reaches 1,000 MW
NHPC Limited has declared the Commercial Operation Date of Unit#4 (250 MW) of the Subansiri Lower HE Project effective 08.05.2026, bringing the project's total operational capacity to 1,000 MW across four commissioned units. The 2000 MW hydroelectric project, configured as 8x250 MW and located across Assam and Arunachal Pradesh, has four units remaining to be commissioned, with updates to be provided in due course.

*this image is generated using AI for illustrative purposes only.
NHPC Limited , a Navratna Enterprise under the Government of India, has declared the Commercial Operation Date (CoD) of Unit#4 (250 MW) of its Subansiri Lower HE Project, effective from 00:00 hours on 08.05.2026. With this commissioning, the total operational capacity at the Subansiri Lower HE Project has reached 1,000 MW, with four of the eight planned units now declared commercial. The disclosure was made in compliance with Regulation 30 of the SEBI (Listing Obligations & Disclosure Requirements) Regulations, 2015, and follows a series of earlier communications to stock exchanges dating back to 05.10.2023.
Subansiri Lower HE Project: Unit#4 Commissioned
The Subansiri Lower HE Project is a 2000 MW hydroelectric project configured as 8x250 MW, situated across Assam and Arunachal Pradesh. With the commissioning of Unit#4, NHPC has now declared the CoD of four of the eight units at this project, cumulatively accounting for 1,000 MW of operational capacity. The following table summarises the units for which CoD has been declared:
| Unit | Capacity |
|---|---|
| Unit#1 | 250 MW |
| Unit#2 | 250 MW |
| Unit#3 | 250 MW |
| Unit#4 | 250 MW |
| Total Operational Capacity | 1,000 MW |
The CoD of Unit#4 was declared effective from 00:00 hours on 08.05.2026, as communicated by the Company Secretariat of NHPC from its office in Faridabad, Haryana.
Project Overview
The Subansiri Lower HE Project has a total installed capacity of 2000 MW, comprising eight generating units of 250 MW each. The project spans the states of Assam and Arunachal Pradesh. Key project parameters are outlined below:
| Parameter | Details |
|---|---|
| Total Project Capacity | 2000 MW |
| Configuration | 8x250 MW |
| Location | Assam/Arunachal Pradesh |
| Units with CoD Declared | 4 (Unit#1, Unit#2, Unit#3, Unit#4) |
| Total Operational Capacity | 1,000 MW |
| CoD of Unit#4 (Effective) | 08.05.2026, 00:00 hours |
Remaining Units
NHPC has stated that the CoD of the remaining units of the Subansiri Lower HE Project will be intimated in due course. The company has been providing regular updates on the commissioning progress of this project since October 2023, with communications issued on multiple dates including 05.10.2023, 13.10.2023, 22.05.2024, 20.08.2024, 22.10.2024, 26.12.2024, 26.05.2025, 30.06.2025, 10.10.2025, 03.12.2025, 18.12.2025, 21.12.2025, 30.01.2026, and 17.03.2026.
Historical Stock Returns for NHPC
| 1 Day | 5 Days | 1 Month | 6 Months | 1 Year | 5 Years |
|---|---|---|---|---|---|
| -2.49% | -2.98% | +7.12% | -1.53% | -0.16% | +235.72% |
What is the projected timeline for commissioning the remaining four units (Units #5–#8) of the Subansiri Lower HE Project, and what factors could accelerate or delay their completion?
How will the addition of 1,000 MW of operational capacity impact NHPC's revenue and earnings per share in the upcoming fiscal year?
Could the full commissioning of the 2,000 MW Subansiri project strengthen NHPC's position in bidding for new hydroelectric projects under India's renewable energy expansion targets?


































