Ethan BrooksBy Ethan Brooks

Updated November 2026

The largest solar thermal power plant in India is the Dhursar plant in Rajasthan, a concentrating solar power facility built in the Jaisalmer district. Its scale and location make it the reference point for the country’s utility-scale solar thermal work, and it is the project most often cited when comparing Indian installations.

The plant follows the same basic principle as other concentrating solar thermal power (CSP) facilities: mirrors or reflectors focus sunlight onto a receiver, the receiver heats a working fluid, and that heat drives a turbine. The sections below explain why Rajasthan is the site, what determines the size of a plant like this, and how to tell whether a figure you see online is accurate.

Shopping for one? See our guide: 7 Best Solar Thermal Energy Power Plant Books for Engineers and Students.

Why Rajasthan Hosts the Largest Solar Thermal Plant

Solar thermal plants depend on direct normal irradiance, meaning sunlight that arrives straight from the sun rather than scattered through haze or cloud. Desert regions with long clear stretches score well on that measure. Rajasthan’s western districts receive strong direct sunlight for much of the year, and large flat tracts of land are available, which keeps the mirror fields contiguous and reduces the cost of connecting to the grid. For a broader look at the state’s projects, see Solar Thermal Power Plant in Rajasthan: How It Works and Why It Matters.

Factors That Determine a Plant’s Size

When people compare “largest” plants, they usually mean rated generating capacity in megawatts, but the picture has several layers:

  • Nameplate capacity: the maximum output the turbine and generator can deliver, usually stated in MW.
  • Net annual output: the electricity actually delivered over a year, which depends on sunshine hours, cloud cover, and maintenance downtime.
  • Thermal storage: some plants use molten salt to keep generating after sunset. Storage can extend operating hours even when nameplate capacity stays the same.
  • Collector type: parabolic troughs, linear Fresnel arrays, power towers, and dish systems each have different land and efficiency profiles. A broader explanation is in Concentrating Solar Thermal Power Basics: How CSP Plants Make Electricity.

Before quoting a capacity figure, check whether the source means nameplate or net output, and whether it refers to a single plant or a combined complex.

How to Verify the Figure You Are Reading

Capacity numbers for Indian solar projects change as phases are commissioned, so treat any single number with some caution. Use these steps to confirm it:

  1. Look for the project’s operating status. Phased builds often announce a total target before all phases are online.
  2. Check whether the figure is solar thermal only or includes solar photovoltaic capacity at the same site.
  3. Compare at least two recent sources, such as government energy ministry publications and the developer’s own disclosures.
  4. Note the date of publication. Figures from several years ago may reflect planned rather than installed capacity.

Practical Tips for Researchers and Students

  • Keep a short table of plant name, location, technology type, and capacity, with the source and date for each row.
  • Separate “under construction,” “commissioned,” and “planned” projects so they are not mixed together.
  • When writing about thermal storage, state the storage duration in hours if the source gives one.

FAQ

Is the largest solar thermal plant in India a photovoltaic plant?

No. It uses concentrating solar thermal technology, which heats a fluid to drive a turbine. Photovoltaic plants convert light directly into electricity with semiconductor cells.

Why is Rajasthan the main location for these plants?

The state gets strong direct sunlight and has large areas of flat, low-use land. Both factors matter for mirror-based systems.

Does the largest plant run at night?

Not unless it has thermal storage. Plants without storage generate only while the sun is shining on the collectors.

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Ethan Brooks

About Ethan Brooks

Ethan Brooks is part of our editorial team and reviews and edits our solar water heaters guides, checking product details against manufacturer specifications and owner feedback.