New Delhi, Apr 24 (PTI) State-owned hydro power giant NHPC on Thursday said the annul revenue of its 520-MW Parbati–III Power Station will increase by Rs 224.70 crore, once the 800-MW Parbati-II project in Himachal Pradesh begins operations.

The power generation at 520-MW Parbati-III power station will increase to 1,669 million units (MUs) in 2025-26 from 572 MUs recorded in 2024-25, NHPC said in a regulatory filing.

Accordingly, with operationalisation of Parbati-II hydro electric project (4X200 MW) Himachal Pradesh, the revenue of Parbati-III Power Station will increase by Rs 224.70 crore to Rs 425.20 crore in 2025-26 from Rs 200.50 crore in 2024-25.

The 520-MW station is situated on the downstream of the Parbati-II Project Power House.

Prabat-II power station has begun commercial supplies recently.

Parbati Hydroelectric Project (Stage-II) is a run-of-the-river scheme proposed to harness hydro electricity potential of the lower reaches of the river Parbati.

The river is proposed to be diverted with a Concrete Gravity Dam at Village Pulga in Parbati valley through a 31.52-km Head Race Tunnel (HRT) and the power house shall be located at village Suind in Sainj valley.

Thus gross head of 863 m between Pulga and Suind will be utilised for generating 800 MW of electricity.

Parbati-III power station, commissioned in 2014, is a pondage type scheme, providing peaking support to the grid to make use of the hydropower potential of river Parbati, Manihar Nallah, Panch Nallah, Huria Nallah & Jiwa Nallah via Parbati-II hydro electric Project and Sainj River. PTI KKS HVA

Hydropower project revenue boost as Parbati II operationalisation increases downstream generation and annual receipts. NHPC reports that commercial operation of the 800 MW Parbati II project will increase generation and annual revenue at the downstream 520 MW Parbati III station by comparing prior year output and receipts with projected figures after Parbati II becomes operational. Parbati II is a run of the river scheme diverting the Parbati River through a 31.52 km head race tunnel to generate 800 MW using an 863 m gross head, while Parbati III is a pondage scheme providing peaking support downstream.