Reacting to the decision, shares of Tata Power dropped 3.83 per cent while Adani Power lost 2.92 per cent on the BSE.
"The Central Commission has no regulatory powers under Section 79(1)(b) of the said Act (Electricity Act, 2003) to vary or modify the tariff or otherwise grant compensatory tariff to the generating companies in case of a tariff determined under a tariff-based competitive bid process...," APTEL said in an order today.
"In view of this...The impugned Order dated February 21, 2014 is hereby set aside," it said.
Similarly, the CERC had allowed higher tariff as well as compensation of Rs 329.45 crore for Tata Power's 4,000 MW Mundra project to compensate for increase in the price of imported coal.
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Meanwhile, Tata Power in a statement said, "Order dated April 15, 2013 and February 21, 2014 passed by CERC were set aside and the matter was remanded back to the CERC to consider the relief to be granted to CGPL for force majeure event. CERC has also been directed to conclude the said exercise expeditiously within a period of three months from today."
In case of Adani Power, the CERC has said that Gujarat has to pay Rs 420.24 crore, while Haryana has to shell out Rs 409.51 crore as compensation from the commissioning date till March 31, 2013.
For the Mundra plant, Adani Power has inked two power purchase agreements (PPAs) with Gujarat - each for 1,000 MW - and PPAs with two Haryana utilities for total capacity of 1,424 MW. Rest of the electricity generated from the plant is sold on merchant basis.
CERC had directed 5 states that procure electricity from the Mundra plant to pay a compensation of Rs Rs 329.45 crore for the period from April 1, 2012 to March 31, 2013.
Electricity from Mundra Ultra Mega Power Project is supplied to Gujarat, Maharashtra, Rajasthan, Haryana and Punjab. It has been facing challenges following rise in the price of Indonesian coal, which is used to fire the plant.
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However, it said, "The quantum of benefits flowing to these generators cannot be ascertained at the moment given that CERC would have to determine the mechanism for ascertaining the tariff compensation to be paid. Further, delays in payment of the same, given the possibility of further appeal by impacted off-takers, cannot be ruled out."
"ICRA estimates that around 20 GW of capacity in the Indian power sector is impacted by issue of under recoveries in tariff/fuel charges," said Sr VP, Co-head corporate Sector rating, ICRA Ltd Sabyasachi Majumdar.
ICRA said that in this order, the APTEL has acknowledged that regulations in Indonesia had affected the economics of the PPAs entered into by APL and CGPL.
This and the non-availability/short supply of coal from domestic sources are being considered as a force majeure event for APL (Adani Power Ltd).
The APTEL directed CERC to assess the extent of impact of force majeure event on the projects of APL and CGPL and provide them relief.