Answer: Uttarakhand
Notes: India’s first Variable Speed Pumped Storage Plant (PSP) has started commercial operations at Tehri in Uttarakhand. It includes a 250 megawatt (MW) unit as part of a larger 1,000 MW hydropower project. The plant stores energy by using surplus electricity to pump water to an upper reservoir, and later releases it to generate power during high demand. This project was executed by THDC India Limited (THDCIL), a public sector company under the Ministry of Power. It is located in Tehri Garhwal district of Uttarakhand.
