India's new energy frontier: geothermal, tidal, fuel cells & green hydrogen

As India navigates the dual challenges of meeting its escalating energy demands and fulfilling its climate commitments, it is strategically pivoting towards a portfolio of advanced and emerging renewable energy sources. Beyond the established pillars of solar and wind, the nation is exploring the immense potential of Geothermal Energy, Tidal Energy, Fuel Cells, and, most significantly, Green Hydrogen. These technologies represent the next frontier in India’s quest for sustainable energy security and global leadership in the green economy.

1. Green Hydrogen: The “Swiss Army Knife” of Energy

Green Hydrogen, produced by splitting water (H₂O) into hydrogen and oxygen through electrolysis powered by renewable energy, is hailed as a game-changing, zero-carbon fuel. Its versatility allows it to decarbonize hard-to-abate sectors like steel, cement, and long-haul transport.

Dynamic Update: The National Green Hydrogen Mission (2023)

The most critical development in this arena is the Union Cabinet’s approval of the National Green Hydrogen Mission in January 2023, with an initial outlay of ₹19,744 crore. This ambitious mission positions India to become a global hub for the production, utilization, and export of Green Hydrogen.

Key Objectives of the Mission:

• Develop green hydrogen production capacity of at least 5 Million Metric Tonnes (MMT) per annum by 2030.
• Attract over ₹8 lakh crore in total investments.
• Create over 6 lakh jobs.
• Enable the decarbonization of key sectors of the economy.

A major component of the mission is the Strategic Interventions for Green Hydrogen Transition (SIGHT) programme, which provides financial incentives for domestic manufacturing of electrolysers and the production of green hydrogen. As of early 2024, the government has allocated significant funds under SIGHT to leading energy companies, kickstarting a competitive ecosystem for green hydrogen production in the country.

Fun Fact: The only byproduct of running green hydrogen through a fuel cell is water vapor. It’s so pure you could drink it, making it a truly zero-emission energy cycle.

For clarity, hydrogen is often categorized by its production method:

• Grey Hydrogen: Produced from methane (natural gas), releasing CO₂ into the atmosphere.
• Blue Hydrogen: Produced from methane, but the emitted CO₂ is captured and stored (CCUS).
• Green Hydrogen: Produced from water electrolysis using renewable energy, with no carbon emissions.

Mnemonic for Hydrogen Types: To remember the carbon impact of each type, use the phrase: “Grey Releases, Blue Captures, Green is Clean.”

2. Geothermal Energy: Tapping the Earth’s Heat

Geothermal energy harnesses the thermal energy generated and stored in the Earth’s interior. It is a highly reliable and consistent source of power, available 24/7, unlike the intermittent nature of solar and wind.

India’s primary geothermal fields are located in the Himalayas, Sohana, West Coast, and the Son-Narmada-Tapi (SONATA) lineament.

Dynamic Update: Ladakh Geothermal Project

In a significant push, India’s first major geothermal energy project is being developed in the Puga Valley of Ladakh. State-owned ONGC began drilling at the site in 2023. This project, being developed in collaboration with the administration of UT Ladakh, aims to tap the high-temperature geothermal potential of the region to generate clean electricity, providing a stable power source for the remote, high-altitude area and reducing its reliance on diesel generators.

Fun Fact: The Earth’s core is as hot as the surface of the sun (about 6,000°C). This internal heat provides a virtually inexhaustible source of energy for geothermal power plants.

3. Tidal Energy: Harnessing the Power of the Oceans

With a coastline of over 7,500 km, India has a significant theoretical potential for tidal energy, which captures the kinetic energy of moving water as tides rise and fall. The most promising locations are the Gulf of Khambhat and the Gulf of Kutch in Gujarat, and the Ganges Delta in the Sundarbans, West Bengal.

While large-scale commercial projects have been slow to materialize due to high capital costs and potential ecological impacts, recent policy focus on the “blue economy” has renewed interest. As of 2024-2025, the government is re-evaluating proposals and exploring hybrid projects, potentially combining tidal energy with offshore wind to improve economic viability.

4. Fuel Cells: Clean, Quiet, and Efficient Power

A fuel cell is an electrochemical device that converts the chemical energy of a fuel (often hydrogen) and an oxidizing agent (often oxygen) directly into electricity, heat, and water. They are highly efficient, quiet, and scalable, making them suitable for a wide range of applications, from powering vehicles to providing stationary power for buildings and data centers.

In India, fuel cell technology is being actively explored for:

• Transportation: Automakers and research institutions are developing fuel cell electric vehicles (FCEVs), particularly for buses and commercial trucks.
• Stationary Power: As a reliable backup power source for critical infrastructure like hospitals and telecom towers.
• Space Technology: ISRO has been a pioneer in developing fuel cell technology for its space missions to provide onboard power.

| Feature Comparison: Emerging Energy Sources | | :--- | :--- | :--- | :--- | | Parameter | Geothermal Energy | Tidal Energy | Green Hydrogen | Fuel Cells | | Primary Source | Earth’s internal heat | Gravitational pull of the moon/sun | Water & Renewable Energy | Hydrogen or other fuels | | Potential in India | Himalayas, Western Ghats | Gulf of Kutch, Khambhat | Nationwide (linked to solar/wind) | Versatile applications | | Key Advantage | High reliability (24/7 power) | Highly predictable & consistent | Versatility, energy storage | High efficiency, zero emissions | | Main Challenge | High upfront cost, geographic limits | High capital cost, ecological impact | High production cost, storage | Fuel availability, catalyst cost |

Critical Policy Appraisal

| Critical Policy Appraisal: National Green Hydrogen Mission | | :--- | :--- | | Challenges / Criticisms | Opportunities / Successes / Way Forward | | High cost of electrolysers and renewable power makes green hydrogen expensive initially. | SIGHT programme incentives are driving down production costs and boosting domestic manufacturing. | | Significant water resources are needed for electrolysis, a concern in water-scarce regions. | Focus on developing projects with seawater desalination or using treated wastewater. | | Lack of dedicated infrastructure for hydrogen storage and transportation. | Mission includes developing strategic hydrogen hubs and pipeline networks. | | Competition from cheaper, established fossil fuels (Grey Hydrogen). | Implementing a green hydrogen consumption obligation (GHCO) for industries can create assured demand. |

Analytical Lens: UPSC Focus (Mains & Prelims)

Conceptual Basis: The primary policy driver for this topic is the National Green Hydrogen Mission (2023). This mission operates within the broader framework of India’s climate goals, specifically its updated Nationally Determined Contributions (NDCs) under the Paris Agreement, which pledge to reduce the emissions intensity of its GDP and increase the share of non-fossil fuel-based energy.

UPSC Integration: Connecting the Dots

• Economy (GS-3): This topic is central to Energy Security, infrastructure development, and creating new avenues for manufacturing (electrolysers) and exports. It directly impacts India’s import bill for fossil fuels.
• Environment & Ecology (GS-3): Crucial for achieving climate change targets, reducing air pollution, and managing the environmental trade-offs of new technologies (e.g., water use for hydrogen, marine impact of tidal).
• Geography (GS-1 & 3): The viability of these energy sources is intrinsically linked to geography—the location of geothermal hotspots, coastal areas with high tidal ranges, and regions with high solar insolation and wind speeds for producing green hydrogen.

Expert Analysis & Future Impact: The strategic push towards this new energy portfolio, especially Green Hydrogen, is a paradigm shift. It’s not merely about adding megawatts; it’s about building strategic autonomy, decarbonizing the industrial backbone of the economy, and positioning India as a technology leader in the 21st-century energy landscape. The success of the National Green Hydrogen Mission could be as transformative for India’s economy and geopolitics as the IT revolution. However, the path is fraught with challenges of cost, infrastructure, and resource management that require sustained policy focus and technological innovation.

Prelims Practice Question (MCQ):

Question: India’s pioneering geothermal field development project, aimed at generating clean electricity by tapping subterranean heat, is being established in which of the following locations? (a) Tattapani, Chhattisgarh (b) Manikaran, Himachal Pradesh (c) Puga Valley, Ladakh (d) Sohana, Haryana

Answer: (c) Puga Valley, Ladakh Explanation: The Government of India, through ONGC, has initiated work on its first major geothermal energy project in the Puga Valley of Ladakh. This site is known for its high geothermal potential with hot springs and sulphur deposits, making it an ideal location for harnessing this form of renewable energy. While the other locations also have geothermal potential, the flagship project is currently underway in Ladakh.

Mains Practice Question:

Question: The National Green Hydrogen Mission is poised to be a cornerstone of India’s energy independence and decarbonization strategy. Critically analyze the mission’s potential to transform India into a global green energy hub and the associated challenges in its implementation. (15 Marks, 250 Words)

Mind Map Outline (Revision Structure)

• Advanced Clean Energy Sources for India
  • Green Hydrogen
    • Definition: Hydrogen produced via electrolysis using renewable energy.
    • Policy Framework: National Green Hydrogen Mission (2023)
      • Core Objectives:
        • 5 MMT annual production by 2030.
        • Make India a global production and export hub.
        • Decarbonize hard-to-abate sectors.
      • Key Components:
        • SIGHT Programme (Incentives for electrolysers & production).
        • Pilot projects in transport, steel, etc.
        • Development of Green Hydrogen Hubs.
    • Types of Hydrogen (Mnemonic: “Grey Releases, Blue Captures, Green is Clean”)
      • Grey: From methane, CO₂ released.
      • Blue: From methane, CO₂ captured (CCUS).
      • Green: From water electrolysis, zero CO₂.
    • Critical Appraisal:
      • Challenges: High cost, water intensity, infrastructure gap.
      • Opportunities: Energy independence, export earnings, green jobs.
  • Geothermal Energy
    • Principle: Harnessing the Earth’s internal heat.
    • Potential Sites in India:
      • Himalayan Belt (Puga, Manikaran).
      • SONATA Lineament (Tattapani).
    • Flagship Project: Puga Valley, Ladakh (by ONGC).
    • Analysis:
      • Pros: High reliability (baseload power), small land footprint.
      • Cons: High exploration risk, geographically limited, high initial investment.
  • Tidal Energy
    • Principle: Capturing kinetic energy from ocean tides.
    • Potential Sites in India:
      • Gulf of Khambhat (highest potential).
      • Gulf of Kutch.
      • Sundarbans Delta.
    • Analysis:
      • Pros: Highly predictable and consistent.
      • Cons: Very high capital cost, potential impact on marine ecosystems.
  • Fuel Cells
    • Principle: Electrochemical conversion of fuel (e.g., hydrogen) into electricity.
    • Key Applications in India:
      • Transportation (FCEV buses).
      • Stationary power generation.
      • Space technology (ISRO).
    • Analysis:
      • Pros: High efficiency, low noise, modularity.
      • Cons: Cost of catalysts (platinum), hydrogen storage challenges.