Extending last session's sharp losses, shares of Adani Power tumbled 9.01 per cent to close at Rs 33.85 on BSE. During the day, it dived 11.55 per cent to Rs 32.90.
Shares of Tata Power fell 1.75 per cent during the day before ending marginally higher by 0.06 per cent at Rs 85.45.
The two stocks had lost up to 16 per cent in the previous session also.
Tata Power's wholly-owned subsidiary Coastal Gujarat Power Ltd and Adani Power had originally moved the Central Electricity Regulatory Commission (CERC) seeking higher tariff on the grounds that their input costs had gone up due to rupee devaluation and higher costs of coal imported from Indonesia, owing to a regulation passed by the Southeast Asian nation.
The apex court did not agree with the contentions of these firms which referred to the findings of the Appellate Tribunal for Electricity that rise in coal price consequent to change in the Indonesian law was a factor that entitled them to claim compensatory tariff.