Upper Sileru hydro project set for 1,350 MW expansion
Upper Sileru (Alluri dist): The Upper Sileru Powerhouse, one of Andhra Pradesh’s oldest hydro- electric projects, commissioned over six decades ago, is set to enter a new phase of expansion with the addition of a massive 1,350 MW pumped storage project. Upon completion, the project is expected to significantly enhance the state’s power generation and energy storage capacity. The pumped storage project, currently under execution, is likely to be completed by 2029. Once operational, it will not only improve peak load management but also strengthen the state’s transition towards a sustainable and resilient energy future.
Located in the scenic and forested Chintapalli agency area of Alluri Sitarama Raju district, the Upper Sileru project has long been a cornerstone of Andhra Pradesh’s hydro-electric network. Since its commissioning in 1967–68, the station has consistently generated 240 MW through four 60 MW units.
The project was developed in two stages. In the first stage, two units of 60 MW each were commissioned during 1967–68. The second stage, completed in 1994–95, added two more units of the same capacity, taking the total installed capacity to 240 MW. Despite crossing its designed lifespan, the power station continues to operate efficiently due to periodic Renovation and Modernisation (R&M) works and robust maintenance practices.
Sileru River flow channelled
Harnessing the waters of the Sileru River through a weir at Guntawada, located about nine miles downstream of the Balimela reservoir, the project benefits from a reliable and steady inflow. Supported by an average annual rainfall of around 1,388 mm in its catchment area, the station ensures consistent water availability for power generation. With an annual generation capacity of about 575 million units, the project continues to meet the state’s energy requirements efficiently and reliably.
The station is equipped with vertical Francis turbine generators. While the first-stage units were sourced from reputed Swiss manufacturers, the second-stage expansion reflects India’s growing self-reliance, with equipment being supplied by Bharat Heavy Electricals Limited (BHEL).
In a major boost to the region’s power infrastructure, the upcoming 1,350 MW pumped storage project will comprise nine reversible units of 150 MW each. It will utilise the existing Guntawada reservoir as the upper reservoir and the Donkarayi reservoir as the lower reservoir. Advanced storage system
The pumped storage system will act as a critical energy storage solution. During periods of surplus electricity—particularly from renewable sources such as solar and wind—water will be pumped to the upper reservoir. During peak demand, the stored water will be released to generate electricity, ensuring grid stability and efficient energy management. Often described as a “battery for the grid,” pumped storage technology plays a vital role in balancing supply and demand while enabling greater integration of renewable energy. With India’s increasing focus on clean energy, such large-scale storage solutions are becoming indispensable.
The Upper Sileru Powerhouse, now primed for building on legacy innovatively, stands as a testament to enduring engineering excellence while gearing up to meet the power demands of the future.
