The Role of Public Finance in CSP Case Study: Rajasthan Sun Technique, India

The Rajasthan Sun Technique CSP plant in India was made viable through a combination of subsidized power purchase agreements (PPAs), long-maturity debt from international public lenders, and a first-mover strategy by a financially strong private developer. While the project achieved low investment and production costs, the broader National Solar Mission (NSM) phase one faced significant deployment delays due to the 'winner's curse' in reverse auctions, overestimation of solar resources, and financing challenges. The project demonstrated high local content (61-71%) and the benefits of linear Fresnel technology, though it lacked energy storage. Key recommendations for scaling CSP in India include improving auction design, incentivizing storage, and mobilizing local private finance to reduce reliance on foreign public debt.

• The financial viability of the Rajasthan Sun Technique plant depended on the Government of India's subsidized power purchase agreement (PPA) and a payment security scheme that protected developers from defaults by sub-national distribution companies.
• International public debt from the Asian Development Bank, FMO, and the US Export-Import Bank provided maturities of up to 18 years, which is significantly longer than the 7-10 year maturities typical of local Indian debt, increasing the internal rate of return for project equity by approximately 250 basis points.
• High costs for hedging foreign exchange risks significantly reduced the economic advantage of foreign debt, nearly doubling the financial charges associated with it.
• India's reverse auctioning scheme for CSP successfully drove down costs—with the average tariff in phase one of the NSM being 25% lower than the reference tariff—but failed to meet deployment targets due to ambitious timelines and the 'winner's curse'.
• Only projects backed by financially strong parent companies capable of sourcing public debt were likely to be completed under the NSM's first phase; of seven projects, only three (Godawari, Megha, and Rajasthan Sun Technique) were nearly completed by mid-2014.
• The Rajasthan Sun Technique plant achieved a high level of local content, estimated at 61-71%, which exceeded the 30% minimum requirement of the National Solar Mission.
• The project's unit capital costs were approximately USD 4,100/kW, which is considerably lower than other linear Fresnel plants globally, which are estimated at over USD 5,800/kW.
• A significant technological gap exists in the Indian CSP portfolio as neither the Rajasthan plant nor other planned projects included heat storage technology, preventing them from delivering power on demand after sunset.
• To scale up CSP in India, there is a critical need to transition from foreign public debt to local private financing, as international development banks have limited exposure limits for specific sectors and countries.

APA

Stadelmann, M., Frisari, G., & Konda, C. (2014). The Role of Public Finance in CSP Case Study: Rajasthan Sun Technique, India. Climate Policy Initiative. https://www.climatepolicyinitiative.org/wp-content/uploads/2014/03/SGG-Case-Study-The-Role-of-Public-Finance-in-CSP-Rajasthan-Sun-Technique-India.pdf

Chicago

Stadelmann, Martin, Gianleo Frisari, and Charith Konda. The Role of Public Finance in CSP Case Study: Rajasthan Sun Technique, India. Climate Policy Initiative, 2014. https://www.climatepolicyinitiative.org/wp-content/uploads/2014/03/SGG-Case-Study-The-Role-of-Public-Finance-in-CSP-Rajasthan-Sun-Technique-India.pdf.

Wikipedia

{{cite report |last1=Stadelmann |first1=Martin |last2=Frisari |first2=Gianleo |last3=Konda |first3=Charith |title=The Role of Public Finance in CSP Case Study: Rajasthan Sun Technique, India |publisher=Climate Policy Initiative |date=March 2014 |url=https://www.climatepolicyinitiative.org/wp-content/uploads/2014/03/SGG-Case-Study-The-Role-of-Public-Finance-in-CSP-Rajasthan-Sun-Technique-India.pdf |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{stadelmann2014role, author = {Stadelmann, Martin and Frisari, Gianleo and Konda, Charith}, title = {{The Role of Public Finance in CSP Case Study: Rajasthan Sun Technique, India}}, institution = {Climate Policy Initiative}, year = {2014}, month = mar, url = {https://www.climatepolicyinitiative.org/wp-content/uploads/2014/03/SGG-Case-Study-The-Role-of-Public-Finance-in-CSP-Rajasthan-Sun-Technique-India.pdf}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }