Chapter Overview

Energy resources (ऊर्जा संसाधन) are examined from two angles in CGPSC. Geography asks where coal, oil, dams, solar parks and reactors are. This Science and Technology chapter asks how they work: how a coal plant or a solar cell makes electricity, why wind power depends on the cube of wind speed, how batteries and hydrogen can store energy, and how a reactor runs on uranium today and on thorium tomorrow. Chhattisgarh, a coal-and-power state with Korba, Sipat and Lara, solar pumps under Saur Sujala and geothermal springs at Tattapani, supplies the examples throughout.

What You’ll Learn

By the end of this chapter, you will be able to:

Trace the energy conversions in a thermal, hydro, solar, wind and nuclear plant, and explain capacity vs generation
Explain supercritical technology, ESP, FGD, fly-ash rules and coal gasification
Distinguish CNG, LNG, LPG, octane and cetane, and the three hydro turbines
Explain the photovoltaic effect, the Betz limit, biogas, biofuel generations, geothermal and OTEC
Compare pumped storage, lithium-ion, LFP, sodium-ion and flow batteries; explain fuel cells and the colours of hydrogen
Name reactor parts and types, follow the nuclear fuel cycle, and explain India’s three-stage programme, PFBR, SMRs and the SHANTI Act 2025
Write Mains answers on clean coal, storage, green hydrogen and nuclear expansion with a Chhattisgarh angle

Prerequisites

Physics in Everyday Life: electricity, generators and transformers
Chemistry in Everyday Life: combustion, electrolysis and isotopes
Minerals and Energy Resources (Geography): where India’s energy resources are, with capacity figures

Learning Path

Follow the topics in this order:

graph TD
    A["1. Conventional Energy Technology
thermal, clean coal, oil, gas, hydro"] --> B["2. Renewable Energy Technology
solar, wind, bio, geothermal, ocean"]
    B --> C["3. Storage, Fuel Cells and Hydrogen
pumped hydro, batteries, green H₂"]
    C --> D["4. Nuclear Energy
reactors, fuel cycle, three stages"]
    D --> E["5. Quick Revision
One-page sheet"]
    E --> F["Next chapter:
Agricultural Science"]

Topics in This Chapter

#	Topic	What it covers
1	Conventional Energy Technology	Energy units, capacity factor; how a coal plant works; subcritical vs supercritical vs USC; coal ranks; ESP, FGD, fly ash rules; coal gasification and CBM; refining and fuel fractions; octane, cetane, BS-VI; CNG, LNG, LPG, shale gas; hydropower and turbines
2	Renewable Energy Technology	India’s 2026 mix; solar PV and cell types; CSP; wind power formula, Betz limit, offshore wind; biomass routes, biogas, CBG, biofuel generations, E20; geothermal; tidal, wave, OTEC; limits of renewables
3	Energy Storage, Fuel Cells and Green Hydrogen	Duck curve; pumped storage in India; Li-ion, LFP, sodium-ion, flow batteries; PLI ACC and BESS VGF; critical minerals and Katghora; fuel cells; hydrogen colours, electrolysers, Green Hydrogen Mission and standard
4	Nuclear Energy	Fission and fusion, ITER; reactor components and types; fuel cycle; three-stage programme, PFBR, KAMINI; institutions and milestones; Nuclear Energy Mission, SMRs, SHANTI Act 2025; pros and cons
—	Quick Revision	Every principle, number and scheme on one page

Where It Is Asked

Paper	What to expect
Prelims P-I (Part 1, India GS)	Principle-based MCQs: which gas is in LPG or biogas, what a moderator or control rod does, fissile vs fertile, Betz limit, PV gives DC, hydrogen colours; plus current-affairs facts (PFBR, SHANTI Act, Green Hydrogen Mission, capacity figures). Statement-based and match-the-following formats are common
Mains P-IV (GS-II), Science and Technology	Short notes (fuel cell, green hydrogen, supercritical technology, three-stage programme) and analytical answers (storage and the energy transition, nuclear expansion, clean coal, bioenergy)

Exam focus

High-yield: reactor components and types; the three stages; CNG vs LNG vs LPG; Betz limit and \(v^3\); biofuel generations; colours of hydrogen; capacity vs generation.
Common mistakes: calling thorium fissile; confusing moderator with control rods; saying solar panels give AC; mixing up green and blue hydrogen; quoting renewable capacity share as generation share.
Chhattisgarh angle for Mains: Sipat and Lara supercritical units; Korba’s fly ash; coal gasification for a top coal state; Saur Sujala solar pumps; rice-husk bioenergy; Tattapani geothermal; Katghora lithium; steel and aluminium as future users of hydrogen and small reactors.

Quick Reference: Energy Sources at a Glance (as of July 2026)

Source	Working principle	India status
Coal (thermal)	Combustion → steam → turbine → generator	Still the largest share of generation; supercritical units at Sipat and Lara
Hydro	Potential energy of water → turbine	~57 GW (large + small)
Solar	Photovoltaic effect (PV) or concentrated heat (CSP)	~164.6 GW, largest RE source
Wind	Kinetic energy of air; \( P \propto v^3 \)	~58 GW; Gujarat leads
Bio-power	Combustion, digestion, fermentation	~11.8 GW; E20 ethanol reached in 2025
Nuclear	Fission of U-235 / Pu-239	24 reactors, 8,780 MW; PFBR criticality 6 April 2026
Total	—	~552 GW, of which non-fossil over 54%
Storage	Pumped hydro, batteries	~7.4 GW pumped storage operating (May 2026)
Green hydrogen	Electrolysis with renewable power	Mission target 5 MMT a year by 2030

Start Learning

Begin with the first topic:

→ Conventional Energy Technology