Fire broke out in the underground powerhouse after a 10MVA transformer of the 120 MW Sanjay Vidyut Project of Himachal Pradesh State Electricity Board (HPSEB) burst at around 3.10 AM, a senior HPSEB official said.
After the fire, the powerhouse was filled with smoke and staff on duty had to come out through the ventilators. There were ten staff on duty at the time of incident.
They suffered from asphyxia and were rushed to hospital, the official said.
"The shut down saved the project as it stopped the fire from spreading but it was yet to be fully controlled as highly inflammable 'transformer oil' is leaking from the transformer at intervals and fire is recurring," Managing Director of HPSEB, PC Negi said.
Fire tenders of the project and of Sutluj Jal Vidyut Nigam, Jaypee Project and from other near by places were fighting the fire for past 14 hours but spilling oil was causing trouble, he added.
Fifteen foam cylinders have been sent from Kalpa while 30 from Shimla were on the way to extinguish the fire, Project authorities said.
The injured persons are safe and out of danger and have been discharged from the hospital, they said.
The Sanjay Vidyut Project has three units of 40 MW each but at present only one unit was in operation as the discharge of water had reduced drastically due to severe winters.
