Solar Thermal Power in India

India Building Large-Scale Solar Thermal Capacity
Parabolic Trough Array
Brighton, Colorado, USA
photo: US D.O.E.

Editor’s Note: Just as on a small scale, hybrid engines stretch a gallon of gas, in the same manner a hybrid power plant can stretch its own supply of fossil fuel. In India, a huge new power station using hybrid systems is close to completing their financing and breaking ground in the sunny state of Rajasthan. This fossil fuel / solar hybrid will produce a whopping 140 megawatts of electric power, and 40 of those megawatts will be produced from a field of solar thermal parabolic troughs. Not as glamorous as photovoltaics, but still much more cost-effective, parabolic systems use mirrors to focus sunlight that in turn heats a thermal media (gas, steam) to drive a turbine generator. The project described below is projected to go in at about US $1 million per megawatt, which is competitive with conventional fuels. Read on…

India’s power sector has a total installed capacity of approximately 102,000 MW of which 60% is coal-based, 25% hydro, and the balance gas and nuclear-based. Power shortages are estimated at about 11% of total energy and 15% of peak capacity requirements and are likely to increase in the coming years. In the next 10 years, another 10,000 MW of capacity is required. The bulk of capacity additions involve coal thermal stations supplemented by hydroelectric plant development. Coal-based power involve environmental concerns relating to emissions of suspended particulate matter (SPM), sulfur dioxide (SO2), nitrous oxide, carbon dioxide, methane and other gases. On the other hand, large hydroplants can lead to soil degradation and erosion, loss of forests, wildlife habitat and species diversity and most importantly, the displacement of people. To promote environmentally sound energy investments as well as help mitigate the acute shortfall in power supply, the Government of India is promoting the accelerated development of the country’s renewable energy resources and has made it a priority thrust area under India’s National Environmental Action Plan (NEAP).

The Indian government estimates that a potential of 50,000 MW of power capacity can be harnessed from new and renewable energy sources but due to relatively high development cost experienced in the past these were not tapped as aggressively as conventional sources. Nevertheless, development of alternate energy has been part of India’s strategy for expanding energy supply and meeting decentralized energy needs of the rural sector. The program, considered one of the largest among developing countries, is administered through India’s Ministry of Non-Conventional Energy Sources (MNES), energy development agencies in the various States, and the Indian Renewable Energy Development Agency Limited (IREDA).

Solar Collectors
Parabolic Dish Array
Rajasthan, India
photo: UNESCO

Throughout the 1990′s, India’s private sector interest in renewable energy increased due to several factors: (i) India opened the power sector to private sector participation in 1991; (ii) tax incentives are now offered to developers of renewable energy systems; (iii) there has been a heightened awareness of the environmental benefits of renewable energy relative to conventional forms and of the short-gestation period for developing alternate energy schemes. Recognizing the opportunities afforded by private sector participation, the Indian Government revised its priorities in July 1993 by giving greater emphasis on promoting renewable energy technologies for power generation. To date, over 1,500 MW of windfarm capacity has been commissioned and about 1,423 MW capacity of small hydro installed. The sector’s contribution to energy supply has grown from 0.4% of India’s power capacity in 1995 to 3.4% by 2001.

India is located in the equatorial sun belt of the earth, thereby receiving abundant radiant energy from the sun. The India Meteorological Department maintains a nationwide network of radiation stations which measure solar radiation and also the daily duration of sunshine. In most parts of India, clear sunny weather is experienced 250 to 300 days a year. The annual global radiation varies from 1600 to 2200 kWh/sq.m. which is comparable with radiation received in the tropical and sub-tropical regions. The equivalent energy potential is about 6,000 million GWh of energy per year. The highest annual global radiation is received in Rajasthan and northern Gujarat. In Rajasthan, large areas of land are barren and sparsely populated, making these areas suitable as locations for large central power stations based on solar energy.

The main objectives of the project are these: (i) To demonstrate the operational viability of parabolic trough solar thermal power generation in India; (ii) support solar power technology development to help lead to a reduction in production cost; and (iii) help reduce greenhouse gas (GHG) global emissions in the longer term. Specifically, operational viability will be demonstrated through operation of a solar thermal plant with commercial power sales and delivery arrangements with the grid. Technology development would be supported through technical assistance and training. The project would be pursued under The World Bank’s Global Environment Fund (GEF) — which has a leading program objective focused on climate change. This project is envisaged as the first step of a long term program for promoting solar thermal power in India that would lead to a phased deployment of similar systems in the country and possibly in other developing nations.

India supports development of both solar thermal and solar photovoltaics (PV) power generation. To demonstrate and commercialize solar thermal technology in India, MNES is promoting megawatt scale projects such as the proposed 35MW solar thermal plant in Rajasthan and is encouraging private sector projects by providing financial assistance from the Ministry.

One of the prime objectives of the demonstration project is to ensure capacity build-up through ‘hands on’ experience in the design, operation and management of such projects under actual field conditions. Involvement in the project of various players in the energy sector, such as local industries, the private construction and operations contractors, Rajasthan State Power Corporation Limited (RSPCL), Rajasthan State Electricity Board (RSEB), Rajasthan Energy Development Agency (REDA), Central Electricity Authority (CEA), MNES and others, will help to increase the capacity and capability of local technical expertise and further sustain the development of solar power in India in the longer term.

The project’s sustainability will depend on to what extent the impact of the initial investment cost is mitigated, operating costs fully recovered, professional management introduced, and infrastructure and equipment support for operation and maintenance made accessible. Accordingly, while the solar thermal station will be state-owned, it will be operated during the initial five years under a management contract with the private sector; subsidy support will be limited to capital costs. Fuel input, power supply and other transactions would be on a commercial basis and backed up by acceptable marketable contracts. Staff selection and management would be based on business practices; the project site would be situated where basic infrastructure is well developed and engineering industries established.

Parabolic Trough Array
Parabolic Trough Array
Tehachapi, California, USA
photo: US D.O.E.

This project is consistent with the World Bank’s Global Environment Fund’s operational strategy on climate change in support of long-term mitigation measures. In particular, the project will help reduce the costs of proven parabolic trough solar technology so as to enhance its commercial viability. This initiative is part of an anticipated multi-country solar thermal promotion program, the objectives of which will be to accelerate the process of cost reduction and demonstrate the technology in a wider range of climate and market conditions.

Demonstrating the solar plant’s operational viability under Indian conditions is expected to result in follow-up investments by the private sector both in the manufacture of the solar field components and in larger solar stations within India.

Insights into local design and operating factors such as meteorological and grid conditions, and use of available back-up fuels, are expected to lead to its replicability under Indian conditions, opening up avenues for larger deployment of solar power plants in India and other countries with limited access to cheap competing fuels. Creation of demand for large scale production of solar facilities will in turn lead to reductions in costs of equipment supply and operation. It is also expected to revive and sustain the interest of the international business and scientific community in improving systems designs and operations of solar thermal plants.

The Project is expected to result in avoided annual emissions of 714,400 tons of CO2, or 17.9 million tons over the life of the project, relative to generation from a similar-sized coal-fired power station. The cost of carbon avoidance is estimated at $6.5 per ton.

The project involves: (i) Construction of a solar thermal/fossil-fuel hybrid power plant of about 140MW incorporating a parabolic trough solar thermal field of 35 MW to 40 MW; and (ii) Technical assistance package to support technology development and commercialization requirements.

Map of Location of Rajasthan in India
Location of Rajasthan

Investment Component. The solar thermal/hybrid power station will comprise: (i) a solar field with a collection area of 219,000 square meters to support a 35MWe to 40MWe solar thermal plant; and (ii) a power block based on mature fossil fuel technology (i.e, regasified LNG). The proposed project will be sited at Mathania, near Jodhpur, Rajasthan in an arid region. In addition to high solar insulation levels (5.8 kWh/m2 daily average), the proposed site involves approximately 800,000 square meters of relatively level land with access to water resources and electric transmission facilities. The solar thermal/hybrid station will operate as a base load plant with an expected plant load factor of 80%. The final choice of the fossil-fired power block would be left to the bidders, subject to performance parameters set out in the tender specifications.

The design choice is an Integrated Solar Combined Cycle (ISCC) involving the integrated operation of the parabolic trough solar plant with a combined cycle gas turbine using naphtha. Such a plant would consist of the solar field; a combined cycle power block involving two gas turbines each connected to a heat recovery steam generator (HRSG) and a steam turbine connected to both HRSG; and ancillary facilities and plant services such as fire protection, regasified liquefied natural gas supply and storage system, grid interconnection system, water supply and treatment systems, etc. A control building will house a central microprocessor control system that monitors and controls plant operations.

The success of the solar thermal/hybrid power plant as a demonstration project will determine if this technology is replicable in other parts of India. The project will provide technical assistance to ensure that adequate institutional and logistical support for the technology is available for future expansion of solar thermal power.

Specifically, funds will be made available for promoting commercialization of solar thermal technologies among potential investors; staff training and development of a local consultancy base; upgrading of test facilities; mproved collection and measurement of solar insolation data and other solar resource mapping activities; and development of pipeline investments.

The total cost of the investment component is estimated at US$ 201.5 million, including interest during construction, physical and price contingencies as well as duties and taxes. Of these costs, the cost of supplies (excluding contingencies) for the solar component including the steam generator amounts to $41 million, and that for the conventional power plant component is $72 million. The cost of the technical assistance component for promoting replication of the solar power technology is estimated at $4 million.

City Palace of Jaipur in Rajasthan India
City Palace of Jaipur
Rajasthan, India

Investors Note: For more information on the solar thermal project in Rajasthan, India, please contact:

Mr. G. L. Somani, General Manager

Rajasthan State Power Corporation Ltd.

E-166, Yudhisthar Marg, C-Scheme, Jaipur, India

Telephone No.: (91-141) 384055

Fax No.: (91-141) 382759

About the Author:
Gordon Feller is the CEO of Urban Age Institute ( During the past twenty years he has authored more than 500 magazine articles, journal articles or newspaper articles on the profound changes underway in politics, economics, and ecology – with a special emphasis on sustainable development. Gordon is the editor of Urban Age Magazine, a unique quarterly which serves as a global resource and which was founded in 1990. He can be reached at and he is available for speaking to your organization about the issues raised in this and his other numerous articles published in EcoWorld.

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20 Responses to “Solar Thermal Power in India”
  1. shaz says:

    Dear Sir

    We need more information about solar home power system selling in USA.

    Best Regards
    p.o. box # 799 college park MD, 20741

  2. Bhavin says:

    Thank you for this article

  3. pankaj says:


    i am going to design a parabolic concentrating dish for 10 kw of power generation can u please send me the formulae and equations used in the designing .


  4. muthusamy.t says:

    It is high time to tap solar thermal energy, is there any other plant of suchkind.I kindly welcome anybody who can share their knowledge in this field.

  5. Dear Sir,

    I need solution for solar power hybrid for building. This is for gov building located in remote area. Any Solution please contact me. Thanks

  6. Abdulkader attar says:

    Dear Sir,

    We need more information about if you can send us more informations about solar for home use


  7. Saurabh says:

    I m a final year B.E. Mechanical student.I have taken a poject on “Design of Solar Thermal Power Plant” of 300W to 500W power output but sadly I have hardly any design details pertaining to it.So,pls available some general design details.I have searched a lot 4 d same but hardly got in with the success.PLS HELP ME.PLS PLSSSSSSSS……………..

  8. pratiyush says:

    Sir, inform also that how many solar power plants have been installated since now-2009.

  9. Siva says:

    Hi Saurabh,

    The Mechanical Engineering Dept of IIT Chennai is doing research on Solar technologies. In fact they have installed 2 thermal power plants of different capacities. You may visit them for further details. Some students are doing MTech and PhD projects on solar energy. ALso visit the Mech Dept website of IIT, Chennai.

    Good Wishes,


  10. P.K.Patnaik says:

    We have to move fast from showcasing of solar PV and csp to larger widespread operating locations that could contribute in some way to reduce our power shortage. Just as in a hydro-thermal ideal combination the former acts for meeting peak power solar must act to be the source of peak power with storage, control system that come with it. The legislation need to come to urge the fossil fuel users (especially coal plants)to produce say 5% of the power from solar by 2010.

  11. Ellen says:

    I especially recommend the coated steel tube to you. It is used in Fresnel power plant and has a high absortance up to 96% and a low emittance 6%. Our coated steel tube exported to America and Spain in 2008.(In the accessory I will attach you the power plant pic in Spain, as well as coated steel tube brochure) In 2009, Himin will build a 1.5-2Mw Fresnel power plant in Dezhou. In this demonstration Fresnel power plant, we show the greatness of the solar thermal power. And now we conduct the cooperation with CAS to R&D the receiver tube, which is used in Parabolic Trough plant. We are strong in coating on the steel tube, and we are seeking for a partner, who are good at vacuum technology and joint weld technology. That is to say, we are finding a partner who are complimentary to our technology.

  12. james says:

    Ellen I am very interested in your Fresnel power plant in Dezhou. how can I contact you please? I may be able to help with the technology you need.

  13. amit says:

    thak a lot for this article ,i want to set up a power plant so send all cost and technologicle related information

  14. nirmalsinh says:

    dear sir ,
    i am nirmalsinh parmar presently i am in power sector and in my college i was work on solar thermal power project but i didn’t get enough response but now i too much interested and i want do something for this or work on this energy saving project so please give me guide line or your contact no.
    thank you ,

  15. Dear Sir

    We are planning for installation of two 50 MW solar thermal power plant in Parawar near Jaisalmer in Rajasthan.
    I would like to know about the technology partners and component suppliers of Dish Sterling technology solar thermal power plant in India.
    If we dont have partners in India, I would like to know about people outside India who can guide us through.

    Thanks & Regards

  16. sridhar says:

    We are inpossession of 200 acres of land on the coast of bay of bengal and have been trying to put up a coastal thermal power project but, have been coming across proposals with requirement of huge investment, but solar thermal power plants as i gather info from your article can be planned at 150 mw capacities also, but will the southern coast have sufficient sunlight i am not aware of the technical details, i would be glad to interact with anybody interested in guiding/collaborating us.

  17. nihar says:

    i m starting ahousing project in orissa and i want to install a low cost thermal solar power station ,can u please provide me some guideline for 40 flatsof a housing project

  18. Rajesh Goyal says:

    We are interested in putting 50+ MW Solar Thermal Power Generation Station in Rajasthan and would be interested in knowing all details. Technology and Solutions Providers are welcome to kindly send details on my email as given in. Rajesh Goyal (+919810001023)


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