Non-Conventional (Renewable) Energy Resources – Long Answer Questions
Medium Level (Application & Explanation)
Q1. Explain the working principle of solar photovoltaic (PV) panels and list some major solar energy projects in India.
Answer:
Solar photovoltaic (PV) panels work by converting sunlight directly into electricity.
When sunlight hits the silicon cells inside the panels, it excites electrons, creating an electric current.
This electric current is collected and can be used to power homes, industries, or charge batteries.
In India, important solar projects include the Bhadla Solar Park (Rajasthan), the Charanka Solar Park (Gujarat), and the Rewa Solar Park (Madhya Pradesh).
Additionally, rooftop solar installations in many cities and solar pumps used in rural irrigation are widely encouraged.
These projects
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India's commitment to producing clean and renewable energy from abundant sunlight.
Q2. Describe how biogas is produced and explain its uses and advantages in rural India.
Answer:
Biogas is produced through anaerobic digestion, where bacteria break down organic matter such as animal dung, kitchen waste, or agricultural waste in the absence of oxygen.
This process happens inside a closed digester known as a gobar gas plant.
The main product is methane-rich biogas, which can be burned for cooking, lighting, and sometimes electricity generation.
The leftover slurry is used as a natural, organic fertilizer.
Advantages of biogas include reducing indoor air pollution, managing organic waste efficiently, providing a reliable cooking fuel, and improving soil fertility.
In rural India, biogas plants improve sanitation, reduce dependence on firewood, and support sustainable farming.
Q3. How is wind energy harnessed to generate electricity? Provide examples of prominent wind farms in India.
Answer:
Wind energy is harnessed by using wind turbines or windmills that convert the kinetic energy of moving air into electrical energy.
When the wind blows, it turns the blades of a turbine, which rotates a rotor connected to a generator to produce electricity.
In India, major wind farms are located at Muppandal in Tamil Nadu, Kutch in Gujarat, and Jaisalmer in Rajasthan.
Other suitable areas include the coastal and highland regions of Maharashtra and Karnataka.
Wind energy is clean, renewable, and a significant contributor to India's renewable power capacity.
Q4. Discuss the importance of non-conventional energy sources for sustainable development.
Answer:
Non-conventional energy sources are crucial because they are renewable and environmentally friendly, producing little or no pollution.
They reduce the use of fossil fuels, thereby lowering greenhouse gas emissions and mitigating climate change.
These sources promote energy security by reducing dependence on imported fuels.
They help in rural development through decentralized energy generation, such as solar pumps and biogas plants, improving agriculture and livelihoods.
Health benefits include reducing indoor pollution caused by burning firewood or coal.
Economically, they create jobs and local businesses in installation, maintenance, and operation.
Ultimately, they support India's goals for clean energy, climate action, and sustainable communities.
Q5. What are the major limitations of tidal energy, and why has it not become widely used in India yet?
Answer:
Tidal energy is generated from the movement of tides — the rise and fall of sea levels — but it is highly site-specific, requiring places with a large tidal range or strong tidal currents.
It has high initial costs due to complex infrastructure like barrages or underwater turbines.
There are environmental concerns such as disturbing marine ecosystems, affecting fisheries, and changing sediment patterns.
India has potential tidal energy sites like the Gulf of Kutch and the Sunderbans, but limited pilot projects so far.
The present technological, financial, and ecological challenges have slowed its large-scale adoption in the country.
High Complexity (Analytical & Scenario-Based)
Q6. Analyze how a combination of solar and wind energy systems can address the problem of intermittency in renewable energy supply.
Answer:
The main challenge with solar and wind energy is intermittency — solar power is only generated during daytime, and wind availability varies with weather.
Combining both exploits their complementary nature: on sunny but still days, solar energy is available; on cloudy or windy nights, wind energy can fill in.
Hybrid systems integrate solar PV panels and wind turbines with battery storage or grid connections to ensure a continuous power supply.
This reduces reliance on fossil fuel backups and improves reliability.
Smart grids and demand management also help balance energy flows.
Thus, combining these resources leads to a more stable and efficient renewable energy system that suits rural and urban electrification.
Q7. Examine the environmental and socio-economic benefits of biogas plants under the National Biogas Program in India.
Answer:
Biogas plants reduce deforestation and firewood collection, preserving forests and biodiversity.
By converting organic waste into energy, they minimize open burning, which causes air pollution.
They help reduce indoor air pollution from traditional cooking methods, improving respiratory health, especially for women and children.
The nutrient-rich slurry improves soil quality, fostering sustainable agriculture.
Socio-economically, families save money on fossil fuels and fuelwood and can sell surplus biogas or fertilizer.
Employment is generated in manufacturing, installing, and maintaining biogas plants.
Hence, the program supports environmental sustainability and rural livelihoods simultaneously.
Q8. Compare geothermal energy with solar energy in terms of availability, environmental impact, and potential for India.
Answer:
Availability:
Geothermal energy comes from heat inside the Earth, continuous and available 24/7 (base load power), but only in specific areas with hot rocks or springs.
Solar energy is abundant and widespread across India but is intermittent, available only during daylight.
Environmental impact:
Geothermal plants have a small land footprint but can release harmful gases or minerals if not managed well.
Solar energy plants produce no emissions during operation and have minimal ecological impact, though large plants require land use.
Potential for India:
Geothermal potential in India is limited to places like Puga (Ladakh) and Tattapani (Chhattisgarh), mostly small or experimental.
Solar energy has vast potential across India, proven by large solar parks and rooftop installations.
Therefore, solar energy is currently more viable and scalable for India, while geothermal remains a niche but promising resource.
Q9. Given the environmental challenges posed by fossil fuels, propose a roadmap for India’s energy future focusing on non-conventional energy.
Answer:
Short term: Intensify deployment of solar and wind energy through government subsidies, rooftop solar promotion, and supporting small-scale wind farms.
Medium term: Invest in battery storage technologies, smart grids and hybrid renewable systems to reduce intermittency and improve reliability.
Develop biogas and biomass energy in rural areas for cooking and electricity, combined with organic farming practices.
Long term: Explore and expand tidal and geothermal energy projects in identified potential sites with environmental safeguards.
Upgrade policy and incentive mechanisms for private sector and community involvement.
Encourage research & development on new technologies and build a skilled renewable workforce.
Implement strict environmental regulations on fossil fuel use and gradually phase out coal plants in favor of renewables.
This integrated roadmap ensures energy access, climate goals, economic growth, and environmental protection.
Q10. Critically evaluate the challenges faced in implementing large-scale renewable energy projects in India and suggest possible solutions.
Answer:
Challenges:
High initial cost and investment risks deter some private investors.
Land acquisition issues due to competing agricultural or ecological priorities.
Intermittency of solar and wind reduces their grid compatibility.
Lack of infrastructure such as grid connectivity and storage facilities.
Need for skilled manpower in installation and maintenance.
Environmental concerns like biodiversity loss and social displacement in some projects.
Solutions:
Government subsidies, low-interest loans, and public-private partnerships to reduce financial barriers.
Transparent and fair land agreements with compensation to local communities.
Integration of hybrid systems and energy storage technologies to ensure reliable supply.
Strengthening the power grid and investing in microgrids for remote areas.
Vocational training and capacity building programs to develop skilled workers.
Conducting thorough environmental impact assessments and enforcing mitigation plans.
Addressing these challenges holistically will help India harness its vast renewable energy potential effectively.
