Need for Thermal Independence For India

Syllabus: GS3/Energy

Context

• Escalating tensions in West Asia and disruptions around the Strait of Hormuz that have increased energy prices and reduced gas availability for Indian industries underscores the urgent need for thermal independence.

About Industrial / Thermal Heat

• Industrial heat refers to thermal energy used in manufacturing processes, such as heating, drying, smelting, and chemical reactions.
• For decades, this heat has been produced by burning fossil fuels such as coal, natural gas, and LPG.
• Examples:
  • Textile industry (Ludhiana): Steam used for dyeing, bleaching, and finishing fabrics.
  • Ceramic industry (Morbi): Kilns operating at temperatures above 1000°C to produce tiles.
• Industrial heat accounts for around 25% of India’s total energy consumption, making it a critical component of industrial productivity and emissions.

Thermal Independence

• It refers to a nation’s capacity to generate heat required for industrial processes using domestic and sustainable sources, rather than imported hydrocarbons.
• It includes electrified heating technologies, solar thermal energy, green hydrogen, biomass and waste heat recovery, and thermal energy storage.

Challenges With Fossil Fuel Based Industrial Heat

• Energy Security Risks: Dependence on imported natural gas exposes industries to geopolitical shocks and price volatility.
  • Events like conflicts in West Asia can disrupt supply chains.
• Energy Inefficiency: Traditional systems are inefficient. Example: Gas boilers lose 20–30% of energy through exhaust heat.
• Climate Impact: Industrial heat contributes significantly to global greenhouse gas emissions, making decarbonisation essential for achieving climate targets.

Structural Constraints in India

• Electricity Grid Limitations: If industries rapidly electrify heat systems, the electricity demand will rise sharply.
  • Industrial clusters require large-scale power supply, and continuous 24/7 electricity.
  • However, renewable energy sources like solar and wind are intermittent, and India’s energy storage capacity is still limited.
• Weak Distribution Infrastructure: Local grids in industrial clusters are often ageing.
  • Issues include overloaded transformers, limited distribution capacity, and lack of high-voltage substations.
  • Upgrading infrastructure will require large investments in transmission and distribution networks.

Emerging Alternatives for Industrial Heat

• Concentrated Solar Thermal (CST): It concentrates sunlight using mirrors to generate heat, unlike solar photovoltaics (which generate electricity).
  • It can generate temperatures up to ~400°C, suitable for many industrial processes such as textiles, food processing, and chemicals.
  • Its advantages include producing direct industrial heat; can store heat in thermal storage tanks; and lower cost of storage compared to lithium-ion batteries.
  • India has an estimated 6.4 GW CST potential, but adoption remains limited.
• Electrification of Industrial Heat: Electrification replaces combustion with electric heating technologies. It includes:
  • Induction Heating: Electric current flows through a coil; and generates a magnetic field that heats metal directly. Its efficiency often exceeds 90% because heat is produced directly in the material.
  • Plasma Heating: Gas is ionised into plasma (fourth state of matter). Plasma torches can achieve extremely high temperatures suitable for ceramics, metals, and chemical processing.

Global Examples

• Miraah Project (Oman): One of the world’s largest solar thermal plants integrated with an oil production facility.
  • Results: Solar energy generates steam during the day; and gas consumption is reduced by about 80%.
• Solar Heat for Industrial Processes (Spain): Companies developed plug-and-play solar thermal units that can be installed on factory rooftops or parking lots and directly connected to existing steam networks.
• Denmark’s Heat Purchase Agreements: Energy companies install and operate heat systems, while factories purchase heat at fixed prices, lowering capital investment barriers.

Policy Measures Needed in India

• National Thermal Policy: India lacks a comprehensive policy focused on industrial heat decarbonisation. A national framework should include:
  • Targets for industrial heat electrification;
  • Promotion of solar thermal technologies;
  • Industrial energy efficiency measures.
• Incentives for CST: Government incentives similar to solar PV are required like Production-linked incentives (PLI) and subsidies for solar thermal installations.
• Carbon Market Reforms: India’s Carbon Credit Trading Scheme can help industries finance decarbonisation.
  • Factories that reduce emissions could sell carbon credits, offsetting capital costs.
• Grid Modernisation: Strengthening power infrastructure through high-capacity transformers, energy storage systems, and smart grids.
• Hybrid Energy Solutions: Industries may adopt hybrid systems combining multiple technologies. For example:
  • CST during daytime;
  • Gas backup for peak demand;
  • Induction heating for precision processes;
  • It enables gradual transition without replacing existing infrastructure.

Conclusion

• The ongoing energy disruptions caused by geopolitical tensions reveal the vulnerability of India’s industrial sector. Achieving thermal independence is crucial for ensuring energy security, industrial resilience, and climate commitments.
• Technologies such as concentrated solar thermal systems, electrified heating, and hybrid energy systems provide viable pathways.
  • However, success will depend on grid upgrades, policy support, and industrial innovation.
• For India’s manufacturing sector to remain globally competitive and sustainable, decarbonising industrial heat must become a national priority.

Source: TH