Match List-I with List-II and select the correct answer using the code given below the Lists : List-I (Hydroelectric power station) A. Srisailam B. Sabarigiri C. Hirakud D. Sileru List-II (Location in the map)

1. Drainage Systems of Peninsular India (basic)

To understand the economic landscape of India, we must first grasp the physical 'plumbing' of the land: the Peninsular Drainage System. Unlike the Himalayan rivers that are fed by melting glaciers, Peninsular rivers are much older and primarily rain-fed (seasonal). This means their water levels fluctuate significantly with the monsoon, which directly impacts agriculture and hydroelectric power generation in the region Geography of India, Majid Husain, Chapter 3, p.5.

The Peninsular drainage is broadly categorized into East-flowing rivers (which drain into the Bay of Bengal and form deltas) and West-flowing rivers (which drain into the Arabian Sea and form estuaries). The two giants we are focusing on today are the Mahanadi and the Krishna:

• The Mahanadi: Rising near Sihawa in Chhattisgarh, it is the lifeline of eastern India. Interestingly, while we often associate it with Odisha, over half of its drainage basin (53%) actually lies in Madhya Pradesh and Chhattisgarh INDIA PHYSICAL ENVIRONMENT, Geography Class XI, Chapter 3, p.23.
• The Krishna: This river originates near Mahabaleshwar in the Western Ghats. It is famous for its 'bird-foot' delta (similar to the Mississippi) and flows through a series of deep gorges, such as the one at Srisailam, which makes it ideal for large-scale hydroelectric projects Geography of India, Majid Husain, Chapter 3, p.21.

Through the ages, these rivers have carved the landscape into a subdendritic pattern (resembling the branches of a tree). Understanding where these rivers flow and how they are tamed by dams is the first step in locating India's major energy hubs.

Feature	Mahanadi River	Krishna River
Source	Sihawa, Chhattisgarh	Mahabaleshwar, Maharashtra
Major Tributaries	Seonath, Hasdeo, Ib, Tel	Tungabhadra, Bhima, Koyna, Musi
Key States	Chhattisgarh, Odisha	Maharashtra, Karnataka, Telangana, Andhra Pradesh
Economic Note	Navigation in lower course	Massive Hydro-potential (e.g., Nagarjun-Sagar)

Sources: Geography of India ,Majid Husain, (McGrawHill 9th ed.), The Drainage System of India, p.5, 21; INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.), Drainage System, p.23; CONTEMPORARY INDIA-I ,Geography, Class IX . NCERT(Revised ed 2025), Drainage, p.22

2. Evolution of Multipurpose River Valley Projects (basic)

To understand the development of India's landscape, we must look at what Jawaharlal Nehru famously called the 'Temples of Modern India': the Multipurpose River Valley Projects. At its core, a Multipurpose Project (MPP) is a large-scale engineering feat designed to serve several needs simultaneously—primarily irrigation, flood control, and hydroelectric power generation. After Independence in 1947, India inherited an agrarian economy crippled by the Partition, which left many fertile lands and irrigation systems in Pakistan Politics in India since Independence, Politics of Planned Development, p.51. To break the cycle of poverty, the government prioritized these massive water management systems.

The evolution of these projects was deeply influenced by global success stories. For instance, the Damodar Valley Corporation (DVC), established in 1948, was modeled directly after the Tennessee Valley Authority (TVA) in the United States Environment and Ecology, Majid Hussain, Natural Hazards and Disaster Management, p.62. The goal was to transform the 'River of Sorrow' (the Damodar) into a source of prosperity by constructing a series of dams to regulate water flow and generate electricity for the industrial belt of West Bengal and Jharkhand. This marked the beginning of a planned approach to water resources where a single river basin was treated as a holistic unit for regional development.

During the First Five-Year Plan (1951–1956), the focus was squarely on the agrarian sector. The government made massive allocations for landmark projects like the Bhakra-Nangal Dam on the Sutlej River and the Hirakud Dam on the Mahanadi River Environment and Ecology, Majid Hussain, Natural Hazards and Disaster Management, p.62. These projects weren't just about water; they were about national pride and self-sufficiency. By the Second and Third Five-Year Plans, the infrastructure created by these projects allowed the Indian economy to enter a 'take-off' stage, providing the stable power and water supply necessary for rapid industrialization and the eventual Green Revolution Geography of India, Majid Husain, Regional Development and Planning, p.4.

Sources: Politics in India since Independence, Politics of Planned Development, p.51; Environment and Ecology, Majid Hussain, Natural Hazards and Disaster Management, p.62; Geography of India, Majid Husain, Regional Development and Planning, p.4

3. India's Hydropower Potential and Infrastructure (intermediate)

In India's energy landscape, hydroelectric power serves as a critical bridge between environmental sustainability and energy security. Unlike thermal power, which relies on coal, hydropower is renewable and offers a unique 'multi-purpose' advantage. These projects are rarely just about electricity; they are essential for flood control, irrigation, and inland navigation Majid Hussain, Environment and Ecology, Chapter: Distribution of World Natural Resources, p.21. While India has vast potential, particularly in the Himalayan and Peninsular river systems, the distribution is uneven. For instance, while states like Punjab have exploited a massive portion of their water potential, eastern states like Odisha and Bihar still have significant untapped reserves Majid Husain, Geography of India, Chapter: The Drainage System of India, p.33.

Currently, hydropower accounts for approximately 12% to 23% of India's total installed capacity, depending on the inclusion of small hydro projects Nitin Singhania, Indian Economy, Chapter: Infrastructure, p.448. The development of these projects is managed by specialized central bodies like the National Hydro-electric Power Corporation (NHPC) and the North-Eastern Electric Power Corporation (NEEPCO). However, the transition from potential to reality faces stiff 'on-the-ground' hurdles. Major challenges include land acquisition issues, environmental resettlement, and inter-state water disputes, which often stall projects for decades when rivers flow through multiple states Nitin Singhania, Indian Economy, Chapter: Infrastructure, p.448.

To master the economic geography of these locations, you must associate major stations with their respective river basins. Key examples include:

Project	River	State/Region
Hirakud	Mahanadi	Odisha (One of the world's longest dams)
Srisailam	Krishna	Andhra Pradesh / Telangana border
Sabarigiri	Pamba/Kakkad	Kerala (Pathanamthitta district)
Sileru	Sileru	Andhra Pradesh / Odisha border

Sources: Environment and Ecology, Majid Hussain, Distribution of World Natural Resources, p.21; Geography of India, Majid Husain, The Drainage System of India, p.33; Indian Economy, Nitin Singhania, Infrastructure, p.448

4. Inter-State River Water Disputes and Governance (intermediate)

Concept: Inter-State River Water Disputes and Governance

5. Ecological Governance in River Valleys (intermediate)

Ecological Governance in river valleys refers to the delicate management framework that seeks to balance human developmental needs—such as hydroelectric power and irrigation—with the preservation of fragile ecosystems. In the Indian context, river valleys are often biodiversity hotspots, making them the primary stage for conflicts between 'infrastructure-led growth' and 'ecological conservation.' The Western Ghats (or Sahyadri), which stretch 1,600 km from the Tapi River to Kanyakumari, serve as a premier example of this governance challenge. This region contains over 5,000 species of flowering plants and nearly 325 globally threatened species, making it one of the world's eight 'hottest hotspots' of biological diversity Geography of India, Majid Husain, Natural Vegetation and National Parks, p.55.

The history of governance here shifted significantly with the Silent Valley movement in Kerala. During the 1970s and 80s, a proposed hydroelectric project threatened to submerge a unique tropical rainforest. Through the lobbying of dedicated environmental groups, the project was halted, and the area was declared a National Park in 1984 Environment and Ecology, Majid Hussain, Major Crops and Cropping Patterns in India, p.122. This marked a turning point where ecological integrity was prioritized over energy production. Today, governance is managed through Ecologically Sensitive Areas (ESAs)—zones where certain industrial activities are restricted to protect the environment. As of 2014, the Western Ghats ESA covers approximately 56,825 km² Geography of India, Majid Husain, Natural Vegetation and National Parks, p.55.

While large-scale dams like Hirakud on the Mahanadi or Srisailam on the Krishna were pivotal for India's post-independence economic surge, modern ecological governance demands a more rigorous Environmental Impact Assessment (EIA). This ensures that the 'downstream' ecological costs—such as soil creep, loss of endemic species, and tribal displacement—are weighed against the 'upstream' economic benefits.

Governance Aspect	Developmental Objective	Ecological Constraint
Hydroelectric Projects	Renewable energy & Grid stability	Submergence of endemic flora/fauna
Protected Areas	Biodiversity conservation	Limitations on local infrastructure
ESA Designations	Sustainable land use	Restrictions on mining and heavy industry

Sources: Geography of India, Natural Vegetation and National Parks, p.55-56; Environment and Ecology, BIODIVERSITY, p.57; Environment and Ecology, Major Crops and Cropping Patterns in India, p.122

6. Mapping Specific Hydroelectric Stations: East and South (exam-level)

When mapping hydroelectric stations in East and South India, we look at how the topography of the Peninsular plateau and the major river systems create ideal sites for power generation. In the East, the landscape is dominated by the Mahanadi river system, while the South relies heavily on the Krishna, Godavari, and Pamba rivers. Understanding these locations requires us to link the river's path with the state boundaries they cross.

In Odisha, the Hirakud Project stands as a marvel of engineering across the Mahanadi River. It is one of the longest dams in the world (approx. 14 km) and was designed to tackle the dual problems of floods and droughts in the region Geography of India, Energy Resources, p.21. Moving further south along the eastern coast to the border of Andhra Pradesh and Odisha, we find the Sileru Project (comprising Upper and Lower Sileru). This station is built on the Sileru River, which is a significant tributary of the Sabari River (itself a tributary of the Godavari), making it a vital energy hub for the South-Eastern corridor.

In the heart of South India, the Krishna River serves as the lifeline for the Srisailam Project. Located in a deep gorge on the border of Andhra Pradesh and Telangana, it is one of the largest hydroelectric stations in the country Environment and Ecology, Distribution of World Natural Resources, p.22. Finally, tucked away in the Western Ghats of Kerala is the Sabarigiri Project. Situated in the Pathanamthitta district on the Pamba River, it utilizes the steep gradients and heavy monsoon rainfall of the far South-West to generate power for the state.

Station	River	Primary State/Region	Geographical Orientation
Hirakud	Mahanadi	Odisha	East
Sileru	Sileru (Sabari)	Andhra Pradesh / Odisha border	South-East
Srisailam	Krishna	Andhra Pradesh / Telangana border	South-Central
Sabarigiri	Pamba	Kerala	Far South-West

Sources: Geography of India, Energy Resources, p.21; Environment and Ecology, Distribution of World Natural Resources, p.22

7. Solving the Original PYQ (exam-level)

This question is a classic application of geospatial mapping, where the concepts of river systems and state-wise infrastructure development converge. Having just studied India's drainage patterns and energy resources, you can see how the Mahanadi, Krishna, and Sabari river basins act as the anchors for these power stations. The key here is not just knowing the state, but visualizing the latitudinal and longitudinal relative positions of these projects. For instance, recognizing that Hirakud is situated in the eastern state of Odisha immediately helps you pinpoint the easternmost coordinate on a map.

To arrive at the correct answer (B), use a process of elimination starting with the most distinct landmarks. First, identify Hirakud (C) as the easternmost point (1) due to its location on the Mahanadi. Second, place Sabarigiri (B) at the southernmost tip (4), as it is located in the Western Ghats of Kerala. Third, differentiate between the two projects in the Deccan/Eastern Ghats transition: Srisailam (A) on the Krishna river occupies a more central position (3), while Sileru (D), being closer to the Odisha border on a tributary of the Godavari, aligns with (2). This systematic mapping confirms the sequence 3-4-1-2.

UPSC often uses spatial proximity traps to confuse candidates. In options like (A) or (D), the examiner swaps the positions of the southern projects. If you correctly identify Hirakud but misplace the vertical alignment of Srisailam and Sabarigiri, you might choose (D) by mistake. The trick is to remember that Sabarigiri is in the far south-west, while Srisailam is further north in the south-central region. As noted in Geography of India, Majid Husain, mastering these relative locations is vital for tackling map-based energy resource questions.