| Location Map: | India Kerala#India |
| Allunkal Dam | |
| Country: | India |
| Location: | Pathanamthitta, Kerala |
| Purpose: | P |
| Status: | O |
| Owner: | Energy Development Company Limited |
| Dam Type: | B |
| Dam Crosses: | Kakkad River |
| Plant Turbines: | 2 × 3.5 MW |
| Plant Capacity: | 7 |
| Coordinates: | 9.3375°N 76.9472°W |
| Plant Coordinates: | 9.3375°N 76.9469°W |
| Plant Operator: | EDCL Power Projects Limited |
| Plant Name: | Allunkal Power House |
| Plant Type: | R |
| Plant Annual Gen: | 32 MU |
| Website: | Ullunkal Hydroelectric Project |
| Operator: | EDCL Power Projects Limited |
| Name Official: | Ullunkal Dam |
The Allunkal Dam is a concrete diversion weir built across the Kakkad River in Chittar panchayat of Ranni taluk in Pathanamthitta district of the Indian state of Kerala.[1] The dam is long and tall above the bed. It is part of the Ullunkal Hydroelectric Project, a small-scale private hydroelectric project operated by EDCL Power Projects Limited, a subsidiary of Energy Development Company Limited (EDCL).[2] [3]
The dam is located about from the nearest town of Chittar, from Seethathodu and from the district headquarters in Pathanamthitta. Chengannur is the nearest railway station, about away.
In 1994, the project was allotted to Travancore Electro Chemical Industries Limited (TECIL), and later, it was taken over by Energy Development Company Limited (EDCL). The project was commissioned in by then-Electricity Minister A.K. Balan.[4] The contract with the government is for 30 years. The electricity generated is paid by the company to Kerala State Electricity Board (KSEB). In addition to the Ullunkal project, EDCL has the Karikkayam Hydroelectric Project in the Kakkad River downstream of the Allunkal dam, with an installed capacity of 15 MW (3 × 5 MW). It is operated by Ayyappa Hydro Power Limited, which is a subsidiary of EDCL.[5] The Ullunkal project site was heavily damaged during the 2018 Kerala floods, resulting in a loss of around ₹ 25 crore.[6]
The power station is located near the dam on the bank of the Kakkad River. It has a total installed capacity of 7 MW with two 3.5 MW S-type Kaplan turbines.[7] The annual production of electricity at the plant is about 32 million units (MU). The electricity generated at the Allunkal power house is distributed to KSEB's Kakkad power station switch yard at Seethathodu through a dedicated long double-circuit transmission line. After the generation of electricity in the power house, water is released directly into the Kakkad River through a tailrace channel, and the tailwater is collected at the power house in Karikkayam for further power generation.[8]