Alternative Heating Technologies Amid Global Gas Supply Risks | 14 Mar 2026

Source: TH 

Why in News? 

The US–Israel conflict with Iran has increased risks in the Strait of Hormuz, a key global oil and gas transit route. As India imports nearly half of its natural gas, reduced gas supplies to industries have highlighted the need for alternative heating technologies such as electrified heat and concentrated solar thermal systems.

What are the Key Heating Technologies for Industrial Applications?

Concentrated Solar Thermal (CST) Technology 

• Mechanism: Unlike Solar Photovoltaic (PV) panels that use semiconductors to convert sunlight into electricity (electrons), CST systems use mirrors or reflective surfaces to concentrate sunlight onto a receiver. 
  • The receiver captures heat and stores it in a Thermal Energy Storage (TES) medium such as oil, molten salt, or phase-change materials. 
  • The stored heat can be used directly for industrial processes, helping decarbonise sectors requiring thermal energy. 
• Heat Generation: It heats a fluid (such as water, thermal oil, or molten salt) to extreme temperatures (up to 400°C), generating raw, intense heat. 
• Industrial Application: It is highly suitable for industries like textiles, where processes such as scouring and bleaching require steam at temperatures between 100°C and 180°C. 
• Grid Independence: CST can generate thermal energy on-site and store it in insulated tanks.  
  • This thermal storage is significantly cheaper than lithium-ion batteries and allows factories to operate 24/7 without drawing power from the national grid. 
• India's Potential: According to the Ministry of New and Renewable Energy (MNRE), India has a CST potential of 6.4 GW. 

Electromagnetic Induction Heating 

• Traditional industrial boilers burn fuel to heat an intermediary medium (like air or steam), which then heats the product. This leads to massive thermal losses. Induction heating eliminates the intermediary, generating heat directly inside the target material. 
• Mechanism: 
  • Electromagnetic Field: An alternating electric current (AC) is passed through a copper coil, creating a rapidly fluctuating magnetic field. 
  • Eddy Currents: When a conductive metal is placed inside this magnetic field, it induces small, localized electrical currents within the metal, known as Eddy Currents. 
  • Joule Heating: As these eddy currents flow, they face the natural electrical resistance of the metal. This resistance converts the electrical energy directly into heat from the inside out (a process known as Joule Heating). 
• Key Advantages for Industry: 
  • Unmatched Efficiency: Because no heat is lost to the surrounding air or exhaust flues, thermal efficiency can exceed 90%. 
  • Rapid and Precise: It heats materials almost instantly and allows for highly localized heating (useful in automotive and metal forging industries). 
  • Zero Direct Emissions: When powered by renewable energy, it completely eliminates the carbon footprint of the heating process. 

Plasma Torches 

• While induction is excellent for metals, heavy industries like ceramics and cement require sustained, ultra-high temperatures (often exceeding 1,000°C) that standard electric heaters cannot achieve.  
• Plasma arc technology provides a clean alternative to gas flames for these extreme thermal needs. 
• Mechanism: 
  • Electric Arc Generation: The process begins by striking a high-voltage electric arc between two electrodes inside the torch. 
  • Ionization of Gas: A working gas (like argon or nitrogen) is forced through this intense electric arc.  
    • The extreme energy strips electrons from the gas atoms, transforming the gas into Plasma (widely known as the fourth state of matter). 
    • Thermal Energy Release: As this highly energized plasma jet exits the torch, it releases massive amounts of thermal energy onto the target material. 
• Key Advantages for Industry: 
  • Ultra-High Temperatures: Plasma torches can easily generate core temperatures ranging from 5,000°C to over 10,000°C (hotter than the surface of the sun), making them ideal for smelting and advanced ceramics. 
  • Controlled Chemical Environments: By using specific inert or reactive gases to create the plasma, industries can control the chemical atmosphere, preventing materials from oxidizing (rusting) during the heating process. 
  • Fuel Substitution: It provides a direct, electrified replacement for highly polluting coal or natural gas furnaces in heavy manufacturing.