The Ponmudi Dam, within the Idukki district, state of Kerala, India, is a hydroelectric undertaking built across the Panniar River, a tributary of the Periyar River which is the longest river in Kerala. Built in 1963, it has a period of 294 metres. The hydropower aspect of the dam has an mounted capacity of 30 MW with company strength of 17 MW, generating 158 GWh annually. The dam, located close to Munnar on the Panniar River within the Periyar River valley in Kerala, is part of the basin of the West flowing rivers of the Tadri to Kanyakumari.
The nearest town is Udumbanchola.Mattupetty to Ponmudi Dam is a distance of 39 kilometres. The Ponmudi Dam is a masonry gravity dam of 59 metres top with a total length of 294 metres. At the Full Reservoir Level, the gross storage capacity of the reservoir is 51,540,000 cubic metres and live garage is 47,400,000 cubic metres. The dam has a complete volumetric content material of 181,000 cubic metres. The dam is positioned in Seismic Zone-III. The reservoir water spread area or submergence location is 2.79 square metres.