Gas-Based Power Generation and Grid Stability in India – Prelims Specific

Introduction

India is increasingly utilising gas-based power plants to manage grid stability and meet peak electricity demand. As the nation shifts toward a higher share of intermittent renewable energy like solar and wind, gas-based power serves as a critical flexible resource to maintain the frequency and reliability of the National Grid.

Why in News?

• The Ministry of Power has directed gas-based power stations to operate during peak demand periods.
• The directive aims to prevent supply shortages and maintain grid frequency as India integrates more variable renewable energy into its power mix.

Static Link

• The issue pertains to the Energy Infrastructure sector under the Economy syllabus.
• Peaking Power Plants: These are facilities designed to run primarily during hours when there is a high demand for electricity.
• Grid Frequency: Maintaining a stable frequency (50 Hz in India) is essential for the electrical system; gas plants provide the operational agility to ramp up or down rapidly to stabilise this frequency when renewable generation drops (e.g., at night for solar).

Institutional Link

• Grid Controller of India Limited (formerly POSOCO): A government-owned body responsible for the integrated operation of the power system through the National Load Despatch Centre (NLDC).
• Ministry of Power: The nodal ministry responsible for energy policy and grid management.
• Central Electricity Regulatory Commission (CERC): A statutory body that regulates tariffs and formulates grid codes under the Electricity Act, 2003.

Core Prelims Facts

• Operational Agility: Gas turbines can synchronise with the grid within minutes, whereas coal units (baseload plants) take several hours to start and stabilise.
• Technology: Most gas-based plants in India operate as Combined Cycle Gas Turbine (CCGT) plants, which increase efficiency by using both gas and steam turbines.
• Role: Gas is increasingly repositioned as a bridge fuel or peaking fuel, rather than a primary baseload source like coal.

Bodies / Organisations / Institutions

• National Load Despatch Centre (NLDC): The apex body for ensuring integrated operation of the national power system.
• CERC: Statutory body established under the Electricity Regulatory Commissions Act, 1998, later subsumed by the Electricity Act, 2003.

Schemes / Laws / Reports / Conventions

• Electricity Act, 2003: The primary legislation governing the power sector, which empowers the government to issue directions for grid security.
• Panchamrit: India’s climate pledge (COP26) targeting net-zero emissions, which necessitates a shift away from coal dependency.
• National Hydrogen Mission: Future policy framework that envisions blending green hydrogen with natural gas in existing infrastructure.

Possible UPSC Prelims Traps

• Trap: Assuming gas-based power is meant to replace coal as the primary baseload energy. (Reality: It is currently a peaking/balancing fuel due to higher operational costs of LNG).
• Trap: Confusing the mandate of CERC (regulatory/tariff) with that of the NLDC (operational/load management).
• Trap: The assumption that gas is carbon-neutral. (Reality: Gas is a fossil fuel with lower emissions than coal, but not carbon-neutral).

One-Minute Revision Notes

• Gas-based power acts as a peaking fuel for grid stability.
• Flexibility is the core advantage compared to thermal (coal) baseload plants.
• NLDC is the key operational body for grid frequency management.
• CERC serves as the regulatory authority for the sector.
• Combined Cycle Gas Turbine (CCGT) is the standard technology for efficiency.

Practice MCQ for Prelims

1. Consider the following statements regarding gas-based power generation in India:

1. Gas-based power plants are primarily used as baseload plants to provide low-cost electricity for base-level demand.

2. The Grid Controller of India Limited (formerly POSOCO) is responsible for the integrated operation of the power system.

3. Gas turbines offer greater operational flexibility than traditional coal-fired thermal power plants.

Which of the statements given above are correct?

A. 1 and 2 only

B. 2 and 3 only

C. 1 and 3 only

D. 1, 2 and 3

Answer: B

Explanation: Statement 1 is incorrect because gas-based plants in India are currently utilised for peaking demand and grid balancing due to the relatively higher cost of imported LNG, not as primary baseload plants (which are coal-based). Statements 2 and 3 are correct.