Thermal Power Production in India: Status and Future.

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Context

Thermal power plays a dominant role in India’s energy landscape. As of 2024, thermal power contributes about 72% of the total electricity generation, making it the backbone of India's energy security. It includes coal-based, lignite-based, gas-based, and diesel-based generation, with coal being the largest component.

India is the second-largest coal producer in the world and possesses the fifth-largest coal reserves, which gives thermal power a strategic importance.

Methods of Thermal Power Generation

  1. Coal-Based Thermal Power:

    • Most common method.

    • Uses pulverised coal burned in boilers to produce steam.

    • Steam drives turbines connected to generators.

  2. Lignite-Based Thermal Power:

    • Similar to coal, but uses lignite (a lower-grade coal).

    • Found primarily in Tamil Nadu and Gujarat.

  3. Gas-Based Thermal Power:

    • Uses natural gas to produce electricity via gas turbines or combined-cycle systems.

    • Cleaner than coal but dependent on gas imports.

  4. Diesel-Based Power:

    • Used for small, remote grids or backup.

    • Costly and polluting—being phased out.

Key Locations

  • Coal-Based Plants:

    • Singrauli (MP & UP), Korba (Chhattisgarh), Talcher (Odisha), Vindhyachal, Chandrapur, Neyveli, Bhusawal.

  • Gas-Based Plants:

    • Dabhol (Maharashtra), Kawas and Gandhar (Gujarat), Barauni (Bihar), Dadri (UP).

  • Lignite-Based:

    • Neyveli Lignite Corporation (Tamil Nadu), Kutch (Gujarat).

Status and Capacity

  • As per Central Electricity Authority (CEA) 2024:

    • Installed capacity of thermal power: ~240 GW (coal ~205 GW, gas ~25 GW, lignite ~7 GW).

    • Coal alone accounts for over 55% of total installed capacity.

    • Despite the rise in renewables, thermal remains crucial for baseload power and grid stability.

Potential and Future Outlook

  • India has an estimated 319 billion tonnes of coal reserves.

  • Some ultra-mega power projects (UMPPs) have been conceptualised to harness economies of scale.

  • High-efficiency supercritical and ultra-supercritical technologies are being adopted to enhance performance and reduce emissions.

Major Initiatives

  • Ultra Mega Power Projects (UMPPs): Large-scale plants (4,000 MW+) under public-private partnership.

  • Renovation and Modernisation (R&M): For older plants to improve efficiency.

  • Emission Norms by MoEFCC: Tighter norms for SO₂, NOx, and PM emissions in thermal plants.

  • Flexibilisation Guidelines: Allowing thermal plants to ramp up/down with renewables integration.

  • Ash Utilisation Policy: Mandating 100% fly ash utilisation for construction and cement.

Challenges

  • Environmental Impact: High CO₂ emissions, fly ash generation, air and water pollution.

  • Fuel Shortages: Despite large reserves, coal production and supply face logistical bottlenecks.

  • Low Plant Load Factor (PLF): Many plants run below capacity (~55-60%) due to renewables and demand fluctuation.

  • Aging Infrastructure: Over 30% of capacity is more than 25 years old.

  • Water Usage: Thermal plants consume large amounts of water—critical in water-stressed regions.

Remedies and Way Forward

  • Accelerate Cleaner Technologies: Promote ultra-supercritical tech, FGD systems (Flue Gas Desulphurization).

  • Coal Gasification: Reduce pollution and boost energy efficiency.

  • Diversify Fuel Mix: Increase reliance on natural gas and renewables.

  • Decentralised Hybrid Models: Thermal + solar hybrids for better load balancing.

  • Improve Logistics: Streamline coal transportation through dedicated freight corridors.

  • Strengthen Regulatory Oversight: Enforce environmental norms and incentivise cleaner practices.

Conclusion

Thermal power continues to anchor India’s electricity generation, but the sector is at a crossroads. While India transitions to a low-carbon future, thermal power must be made cleaner, more efficient, and flexible. Balancing energy security, economic viability, and environmental sustainability will determine the sector's role in India's future energy mix.

Keywords for UPSC: Thermal power, coal-based plants, NTPC, CEA, supercritical technology, UMPPs, PLF, emission norms, coal gasification, energy transition.

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