Renewable energy questions split cleanly into two kinds, and knowing which is which saves a lot of wasted memorising. The institutions, schemes, locations and definitions never change. The installed capacity figures and the rankings change every few months, and they are the most common outdated fact in this topic. This post covers the stable half properly, marks the moving half clearly, and ends with previous year questions.
Key Points (Quick Revision)
- Nodal ministry — Ministry of New and Renewable Energy (MNRE)
- International Solar Alliance — headquarters at Gurugram, India
- Bhakra Nangal on the Sutlej · Tarapur — India's first nuclear power station
- Muppandal, Tamil Nadu — among India's best-known wind farms
- 🔴 Installed capacity numbers change constantly — verify before any exam
1. Sources of energy — the classification asked
| Type | Sources |
|---|---|
| Renewable or non-conventional | Solar, wind, hydro, biomass, geothermal, tidal and wave |
| Non-renewable or conventional | Coal, petroleum, natural gas, nuclear fuel |
Two classification traps are asked directly. Nuclear energy is not renewable, because uranium is a finite mineral, even though it produces no carbon dioxide at the point of generation. And large hydro is renewable but was historically counted separately from other renewables in Indian statistics, which is why older figures for renewable capacity look smaller than newer ones.
Biomass, biogas and biofuel are grouped as renewable. The distinction asked is that ethanol comes from sugarcane and grain while biodiesel comes from non-edible oilseeds such as jatropha, and the Ethanol Blending Programme relates to petrol rather than diesel.
2. Institutions and international bodies
| Body | What it does | Based at |
|---|---|---|
| Ministry of New and Renewable Energy | Nodal ministry for renewable energy in India | New Delhi |
| International Solar Alliance (ISA) | Treaty-based alliance of solar-resource-rich countries, launched jointly by India and France | Gurugram, Haryana |
| Solar Energy Corporation of India | Implements solar projects and tenders | New Delhi |
| Indian Renewable Energy Development Agency | Financing arm for renewable projects | New Delhi |
| National Institute of Solar Energy | Research and testing | Gurugram |
| Bureau of Energy Efficiency | Energy efficiency, star labelling, Perform Achieve and Trade | New Delhi |
| IRENA | International Renewable Energy Agency | Abu Dhabi, UAE |
| Atomic Energy Commission and Department of Atomic Energy | Nuclear programme | Mumbai |
The International Solar Alliance headquartered at Gurugram is the most asked institutional fact in this topic, because it is the first international treaty-based organisation headquartered in India. Keep it apart from IRENA at Abu Dhabi, which papers use as the distractor.
3. Schemes and missions
| Scheme | What it covers |
|---|---|
| PM-KUSUM | Solar pumps and grid-connected solar for farmers |
| PM Surya Ghar: Muft Bijli Yojana | Rooftop solar for households, with free electricity up to a stated limit |
| National Solar Mission | The solar component of the National Action Plan on Climate Change |
| National Green Hydrogen Mission | Green hydrogen production and export |
| Production Linked Incentive for solar modules | Domestic manufacture of high-efficiency solar modules |
| UJALA | LED distribution for energy efficiency |
| Saubhagya | Household electrification |
| Deendayal Upadhyaya Gram Jyoti Yojana | Rural electrification and feeder separation |
| Ethanol Blending Programme | Blending ethanol with petrol |
PM-KUSUM and PM Surya Ghar are the two asked most, and the distinction is the beneficiary — KUSUM is for farmers and pumps, Surya Ghar is for household rooftops. The National Solar Mission is asked as one of the eight missions under the National Action Plan on Climate Change, which is the linkage to environment papers.
Scheme targets, subsidy amounts and blending percentages are revised regularly, so treat any number attached to these schemes as something to verify rather than memorise. The scheme-to-purpose pairing is what stays stable.
4. Where the plants are — the location questions
| Type | Well-known Indian examples |
|---|---|
| Hydro | Bhakra Nangal on the Sutlej, Hirakud on the Mahanadi, Nagarjuna Sagar on the Krishna, Tehri on the Bhagirathi, Sardar Sarovar on the Narmada |
| Nuclear | Tarapur, Maharashtra — India's first; Rawatbhata, Rajasthan; Kalpakkam, Tamil Nadu; Kudankulam, Tamil Nadu; Narora, Uttar Pradesh; Kakrapar, Gujarat; Kaiga, Karnataka |
| Wind | Muppandal in Tamil Nadu; Jaisalmer in Rajasthan; Kutch in Gujarat |
| Solar parks | Bhadla in Rajasthan, Pavagada in Karnataka, Kurnool in Andhra Pradesh, Rewa in Madhya Pradesh |
| Geothermal | Puga Valley in Ladakh, Manikaran in Himachal Pradesh |
| Tidal | Gulf of Kutch and Gulf of Khambhat in Gujarat — the highest potential sites |
Tarapur as India's first nuclear power station and Bhakra Nangal on the Sutlej are the two most asked location facts. Kudankulam is asked for its Russian collaboration, and Kalpakkam for the fast breeder reactor programme.
Among solar parks, Bhadla in Rajasthan is the one usually named as the largest, but park capacities and rankings change as new phases come online, so treat "largest" claims as current affairs rather than static general knowledge.
The Gulf of Kutch and Gulf of Khambhat pairing for tidal energy potential is stable and reliably asked, because it follows from the tidal range there rather than from any installation.
5. The part that keeps changing
This section exists so that you do not memorise something that will be wrong by the time you sit the paper.
| Fact type | Why it moves |
|---|---|
| Total installed renewable capacity | New capacity is added every month |
| Share of renewables in the energy mix | Changes with every addition |
| Which state leads in solar or wind capacity | Rankings shift between Rajasthan, Gujarat, Karnataka and Tamil Nadu |
| Largest solar park | Changes as phases are commissioned |
| National renewable capacity targets | Revised and restated at climate conferences |
| Ethanol blending percentage achieved | Rises each year against a moving target |
The practical rule is simple. Learn the institutions, the scheme purposes, the plant locations and the definitions once — those keep working for years. Check every number and every "largest" or "first-ranked" claim against a recent official source in the fortnight before your examination. A figure printed in a book two years old is almost certainly wrong now, and it is the commonest way this topic is answered incorrectly.
India's climate commitments, including the net-zero target year and the non-fossil capacity goals, are stated and restated at international forums, so those too belong in the moving column rather than the fixed one.
6. Previous year questions
- Which ministry is the nodal ministry for renewable energy in India? — Ministry of New and Renewable Energy
- Where is the headquarters of the International Solar Alliance? — Gurugram, Haryana
- The International Solar Alliance was launched jointly by India and which country? — France
- Where is the headquarters of IRENA? — Abu Dhabi
- Which was India's first nuclear power station? — Tarapur, Maharashtra
- The Bhakra Nangal project is on which river? — Sutlej
- The Hirakud dam is built on which river? — Mahanadi
- Kudankulam nuclear plant is in which state? — Tamil Nadu
- Muppandal, known for wind energy, is in which state? — Tamil Nadu
- PM-KUSUM scheme is meant for whom? — Farmers, for solar pumps and grid-connected solar
- PM Surya Ghar scheme relates to what? — Rooftop solar for households
- Is nuclear energy renewable? — No, uranium is a finite mineral
- Which gulfs have the highest tidal energy potential in India? — Gulf of Kutch and Gulf of Khambhat
- Ethanol for blending is produced mainly from what? — Sugarcane and grain
- Puga Valley, known for geothermal energy, is in which region? — Ladakh
7. How to revise this topic
Divide your notes into two columns from the start — fixed and moving — and never mix them. The fixed column holds the ministry, ISA and IRENA, the scheme-to-purpose pairs, the plant locations and the renewable-versus-non-renewable classification. That column is learnt once.
The moving column holds every capacity figure, every share, every ranking and every target. Do not learn it early. Read it once from a recent official source shortly before the examination, and accept that the version you learn will expire.
Within the fixed column, the highest-return group is the plant locations, because they appear in geography papers as well as economy. Tarapur, Bhakra Nangal, Kudankulam, Kalpakkam and Muppandal alone answer a large share of what is asked.
8. Frequently Asked Questions
Is nuclear energy renewable?
No. Uranium is a finite mineral, so nuclear energy is classed as non-renewable even though it produces no carbon dioxide at the point of generation. This is one of the most common classification traps in the topic.
Where is the International Solar Alliance headquartered?
At Gurugram in Haryana. It was launched jointly by India and France and is the first international treaty-based organisation headquartered in India. Do not confuse it with IRENA, the International Renewable Energy Agency, which is based at Abu Dhabi.
Which was India's first nuclear power station?
Tarapur in Maharashtra. Other well-known stations are Rawatbhata in Rajasthan, Kalpakkam and Kudankulam in Tamil Nadu, Narora in Uttar Pradesh, Kakrapar in Gujarat and Kaiga in Karnataka.
What is the difference between PM-KUSUM and PM Surya Ghar?
PM-KUSUM is for farmers, covering solar pumps and grid-connected solar on farmland. PM Surya Ghar is for households, covering rooftop solar with free electricity up to a stated limit. The beneficiary is what the question tests.
Which state leads in renewable energy capacity?
This changes. Rankings shift between Rajasthan, Gujarat, Karnataka and Tamil Nadu as new capacity is commissioned, and so do the total capacity figures. Check any such claim against a recent official source rather than memorising it from a book.
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