**Summary:**
In response to Lok Sabha Unstarred Question No. 1983, answered on July 31, 2025, the Ministry of Power addressed the adoption of the indigenous resource adequacy model, STELLAR, within State power distribution companies (DISCOMs). STELLAR, developed by the Central Electricity Authority (CEA), is a long-term capacity expansion model that incorporates demand response. As of June 13, 2025, the Monitoring Committee of the Power System Development Fund (PSDF) approved the purchase of 31 GAMS software licenses for the CEA STELLAR tool, with a PSDF grant of ₹5.35 Crores. The tool is slated to be distributed to the States in the near future. The response also indicates that details regarding specific State utilities and DISCOMs that have adopted the tool, the top three States exhibiting the highest deviation between previous resource planning models and STELLAR projections, policy or infrastructure changes resulting from STELLAR's projections, and estimated cost savings due to STELLAR's optimization capabilities are not yet available, as the tool is still in the process of being disseminated. The question was addressed to the Minister of Power by Shri Trivendra Singh Rawat and Smt. Himadri Singh and answered by the Minister of State in the Ministry of Power, Shri Shripad Naik.
Key Entities Referenced
CEA: Central Electricity Authority, developer of the STELLAR model.
STELLAR: State-of-the-art fully indigenous resource adequacy model for power distribution.
SHRI TRIVENDRA SINGH RAWAT: Member of Parliament who asked the question in Lok Sabha.
SMT. HIMADRI SINGH: Member of Parliament who asked the question in Lok Sabha.
DISCOMs: Power distribution companies in various States.
SHRI SHRIPAD NAIK: The MINISTER OF STATE IN THE MINISTRY OF POWER.
Power System Development Fund (PSDF): Fund used for purchasing GAMS software licenses for CEA STELLAR tool.
GAMS: Software for the CEA STELLAR tool.
GOVERNMENT OF INDIA
MINISTRY OF POWER
LOK SABHA
UNSTARRED QUESTION NO.1983
ANSWERED ON 31.07.2025
USE OF STELLAR IN POWER DISTRIBUTION COMPANIES
†1983. SHRI TRIVENDRA SINGH RAWAT:
SMT. HIMADRI SINGH:
Will the Minister of POWER
be pleased to state:
(a) whether the state-of-the-art fully indigenous resource adequacy model
called STELLAR has been distributed to all States and power distribution
companies (DISCOMs);
(b) if so, the details of the State utilities and DISCOMs that have adopted or
operationalized this tool;
(c) the top three States that have shown the highest deviation between their
previous resource planning models and projections made by STELLAR and the
changes ushered in their policies or infrastructure as a result of the same; and
(d) the estimated cost savings due to the use of STELLAR in optimizing
generation, distribution, storage and ancillary services?
A N S W E R
THE MINISTER OF STATE IN THE MINISTRY OF POWER
(SHRI SHRIPAD NAIK)
(a) to (d): Resource Adequacy Model (STELLAR) developed by CEA is a long
term capacity expansion model with demand response. The Monitoring
Committee of Power System Development Fund (PSDF) in its meeting held on
13.06.2025, approved the proposal for purchase of 31 GAMS software licenses for
CEA STELLAR tool with PSDF grant of ₹5.35 Cr. The tool will be made available
to the States shortly.
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