Lecture 12 Solar Energy : Part 9

Summary

The lecture reviews Indian solar-energy policy, residential solar costs and subsidies, domestic manufacturing, environmental impacts, and the Bhadla Solar Park case study.

1. National Solar Mission and related schemes

The National Solar Mission, launched in 2010 and initially called the Jawaharlal Nehru National Solar Mission, is presented as a central part of India’s energy transition.

The lecturer describes three target phases: an initial target of 1.1 GW, a 10 GW target, and a later target revised from 20 GW to 100 GW. The lecture says these targets were achieved.

According to the subtitles, India had 150.2 GW of installed solar capacity as of March 2026, out of 533 GW of total installed capacity. The lecture also describes a longer-term vision of reaching 300 GW of solar capacity by 2030.

Key schemes discussed include:

• PM Surya Ghar Muft Bijli Yojana: Supports grid-connected rooftop solar for households, with a stated aim of reaching 10 million households and providing up to 300 units of electricity free per month.
• PM-KUSUM: Promotes solar power in agriculture, including solar pumps and installations on agricultural or unused land.
• Solar Park Scheme: Provides shared “plug-and-play” infrastructure for large solar projects, such as Bhadla and Pavagada.
• Green Energy Corridor: Builds transmission infrastructure to carry renewable electricity from generation sites to the grid.

2. Residential solar costs and subsidies

Central financial assistance is described as roughly ₹30,000 per kW for 1–2 kW systems. The lecture estimates that, after the subsidy, household costs are approximately ₹35,000–₹45,000 per kW, depending on the system and its price.

For systems above 2 kW, the subsidy increase is limited. The lecture says the central subsidy is capped at ₹78,000 for systems above 3 kW. Some states, including Delhi and Uttar Pradesh, are said to provide additional assistance of around ₹30,000.

Households generally need to meet these requirements to claim central assistance:

• Install a grid-connected, metered system.
• Purchase through a government-empanelled vendor.
• Meet domestic-content requirements, meaning most of the module content must be made in India.

The PM Surya Ghar scheme does not generally subsidize stand-alone, off-grid systems. The lecture describes several exceptions:

• PM-KUSUM Component B: Supports stand-alone solar agricultural pumps, with stated subsidies of 60–80% for eligible farmers, particularly in off-grid or remote areas.
• Hilly and special-category regions: Certain off-grid home systems or solar lights may receive subsidies of up to 90%.
• MNRE off-grid programmes: Support items such as solar street lights and study lamps, often administered through state renewable-energy agencies.

3. Solar PV costs and Indian manufacturing

The lecture gives the following approximate breakdown of solar PV system costs:

Cost category Approximate share Hardware, including panels, inverters, and batteries 52% Supply chain and logistics 15% Labour 9% Overheads and operations 8% Permitting and grid interconnection, customer acquisition, financing, and contingency Remainder

Within a panel’s bill of materials, solar cells are identified as the largest cost component, at about 55%. Other components and assembly processes—including glass, frame, backsheet, junction box, encapsulants, and manufacturing—are given shares ranging roughly from 4% to 12%.

The lecture distinguishes between:

• Module capacity: Assembling solar cells into finished panels. This is less capital-intensive and has expanded substantially in India.
• Cell capacity: Manufacturing the cells used in modules. This is more expensive and remains comparatively limited.

The lecture says Indian manufacturers still rely heavily on imported cells and materials, particularly silicon and other inputs sourced from China. It names Tata Solar Power, Adani, Waaree, Vikram, and ReNew among major companies, noting that many are expanding module production.

4. Major solar parks

The lecture identifies a very large Gujarat project, captioned as “Kawada Renewable Energy Park,” with a stated operating capacity of about 9,400 MW and plans for further expansion.

Bhadla Solar Park in Rajasthan is described as a fully operational 2.2 GW facility built in four phases. Other large parks are mentioned in Rajasthan, Karnataka, and Andhra Pradesh, with capacities generally in the 1–2 GW range.

Projects were often developed in phases because of land constraints, investment requirements, equipment availability, and the need to connect generation to the grid progressively.

5. Environmental impacts of solar PV

Solar PV’s main emissions occur during upstream stages—raw-material extraction, manufacturing, and construction—rather than during operation. The lecture estimates solar PV emissions at 35–40 g CO₂-equivalent per kWh, compared with roughly 1,000 g per kWh for coal.

Solar power uses relatively little water during operation, mainly for cleaning panels, and is described as using substantially less water than fossil-fuel generation. Potential drawbacks include:

• Large land requirements for utility-scale plants.
• End-of-life waste that requires specialized recycling.

The lecture emphasizes assessing solar’s life-cycle impacts across raw-material extraction, manufacturing, installation, operation, decommissioning, and recycling.

6. Bhadla Solar Park case study

Bhadla is located in Rajasthan’s Thar Desert, where strong solar radiation supports generation. The lecture gives its capacity as 2,200 MW and says it was built in four phases.

The project is described as using monocrystalline, polycrystalline, and bifacial panels. Its stated capacity factor is about 19–25%, varying by phase and tracker technology.

The lecture estimates that construction created around 10,000 jobs, with roughly 1,500–2,000 roles in operation and maintenance. It names the Asian Development Bank, World Bank, SBI, and IREDA among the project’s funders.

Challenges and responses

• Dust and soiling: Dust was said to reduce yield by as much as 30%. Waterless robotic brush cleaning was proposed because water is scarce.
• Water scarcity: Water-based manual cleaning was impractical; dry cleaning reduces dependence on groundwater.
• Extreme heat: Modules with better high-temperature performance and low temperature coefficients were recommended, including PERC modules.
• Intermittent generation and grid instability: The lecture describes AI-assisted weather and load forecasting as a response.
• Abrasive sand: Filtered protective housings were used to help protect sensitive electronics.
• Transmission from a remote site: Green Energy Corridor infrastructure and dedicated high-voltage lines were cited as ways to improve power evacuation.
• Thermal stress: Flexible galvanized-steel mounting structures were proposed to accommodate temperature-driven expansion.

Local effects

The project’s local effects were mixed:

• It created jobs and encouraged technical training among local youth.
• New roads and telecommunications improved connectivity, while some CSR projects supported access to drinking water.
• Solar development increased nearby land values.
• Fencing and land occupation reduced some traditional grazing areas, affecting nomadic herding.

The lecture gives a tariff range of ₹2.4–₹2.6 per unit and states that the park reduces emissions by 5.6 million tonnes of CO₂ annually and supplies electricity equivalent to the needs of 4.5 million homes.

Speakers and sources featured

The lecturer is identified in the video metadata as Prof. Sonal K. Thengane. No other speakers are heard in the subtitles.

Organizations and programmes referenced include the National Solar Mission, MNRE, PM Surya Ghar Muft Bijli Yojana, PM-KUSUM, UREDA and other state renewable-energy agencies, the Asian Development Bank, the World Bank, the State Bank of India, and IREDA.