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TRANSMISSION CORPN. OF A.P. LTD. & ANR. versus SAI RENEWABLE POWER PVT. LTD. & ORS.

Citation: [2010] 8 S.C.R. 636 · Decided: 08-07-2010 · Supreme Court of India · Bench: B.S. CHAUHAN · Disposal: Disposed off

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Judgment (excerpt)

[2010] 8 S.C.R. 636 
A 
TRANSMISSION CORPN. OF A.P. LTD. & ANR. 
B 
c 
v. 
SAi RENEWABLE POVVER PVT. LTD. & ORS. 
(Civil Appeal No. 2926 of 2006 etc.) 
JULY 8, 2010 
[DR. B.S. CHAUHAN AND SWATANTER KUMAR, JJ.] 
Electricity - Promotion of generation of grid quality power 
from non-conventional sources -- Guidelines issued by 
Central Government indicating the purchase price of such 
electricity - State Government granting uniform incentives 
to all the projects based on renewable sources of energy -
Order reviewing the tariff and imposing restriction on sale to 
third party - Non-conventional energy developers/generators 
D accepted and acted upon the order by entering into Power 
Purchase Agreements -
Thereafter State Electricity 
Regulatory Commission determining the purchase price for 
procurement of such electricity and also imposing restriction 
with regard to sale thereof to third party- Propriety of the order 
E of the Regulatory Commission - Held: It is within the power 
and jurisdiction of the Regulatory Commission to determine 
the 'purchase price' and to impose restriction on sale to third 
party - The Commission was not estopped from altering the 
purchase rates or imposing restriction on the sale - The 
F 
incentives initially provided by the authorities under the 
guidelines issued by the Central Government and the Power 
Purchase Agreements were not for indefinite period, but were 
subject to review - The contracts entered into by the parties 
provided for review and the restriction for sale to third party -
Parties are bound by contractual obligation and such 
G 
obligation cannot be frustrated by aid of promissory estoppel 
- Agreements cannot be said to be result of duress - Duress 
not proved, so as to render the contract voidable - Conditions 
of a contract cannot be altered/avoided on presumptions or 
H 
636 
TRANSMISSION CORPN. OF A.P. LTD v. SAi RENEWABLE 637 
POWER PVT. LTD. 
assumptions -
Determination of tariff is a function assigned 
A 
legislatively to Regulatory Commission - Supreme Court in 
exercise of powers under Article 136 of the Constitution would 
not sit as an appellate authority over the formation of opinion 
and determination of tariff by the specialized bodies - Matters 
remanded to the Regulatory Commission to fix/determine the 
B 
tariff for purchase of electricity -
Electricity Regulatory 
Commission Act, 1998 - s. 17 - Andhra Pradesh Electricity 
Reform Act, 1998 - s. 11 - Electricity Act, 2003 - ss. 61 and 
62 r/w. s. 86(1)(a) and (b) - Contract - Promissory Estoppel 
- Constitution of India, 1950 - Article 136. 
c 
Administrative Law: 
Principle of promissory estoppel -
Nature and 
applicability of - Discussed. 
Principle of legitimate expectation - Applicability of 
Judicial Review - Scope of, in policy matters. 
Maxim -
'Al/egans contraria non est audiendus' -
D 
Applicability of. 
E 
Words and Phrases -
'Tariff' and 'Purchase price' -
Meaning of 
Ministry of Non-Conventional Energy Sources of 
Central Government wrote letter dated 7.9.1993 to 
F 
different States informing that under new strategy and 
action plan of the Ministry, special emphasis would be 
given to generation of grici quality power from non-
conventional sources. Guidelines drawn up by the 
Ministry were also enclosed with the letter, whereby a 
G 
minimum buy back price of Rs. 2.25 per unit was 
proposed. The transmission of electricity was required to 
be undertaken by State Electricity Board. 
In furtherance of the decision of the Central 
H 
638 
SUPREME COURT REPORTS 
(2010] 8 S.C.R. 
A Government and the Guidelines, State of Andhra Pradesh 
issued two different Government Orders dated 18.11.1997 
and 22.11.1998 granting uniform incentives to all the 
projects based on renewable sources of energy. The 
Power Purchase Agreement (PPA) between the appellant-
s Corporation (APTRANSCO) and non-conventional power 
project developers were executed. The A.P. Regulatory 
Commission passed an order on 20.6.2001 determining 
the tariff as well as defining other rights and obligations 
between the parties including that the generators of 
c electricity were not permitted to make sale in favour of 
third party. After passing of this order, developers 
entered into PPAs and confirmed the acceptance and 
implementation of the order dated 20.6.2001. The PPAs 
as well as the order dated 20.6.2001 specifically provided 
0 for review/revision of purchase price. The order dated 
20.6.2001 was never challenged. 
There

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