General Studies Paper 3
Context:
- The crisis in Joshimath for over a month has led to conversations on the relevance of hydropower in the Himalayan region. Glacier burst led to concerns over the Rishiganga hydroelectric project in Uttarakhand.
Hydropower:
- Hydroelectricity is a renewable energy source that uses the potential energy of the water stored in the dams, reservoirs, flowing rivers etc.
- The falling or flowing water rotates the turbine which spins a generator and the mechanical energy of the generator is converted to electric energy and hence the electricity is generated from the water.
- Hydroelectricity accounts for about 17% of the total electricity sources worldwide.
- Hydropower is considered green energy because it generates electricity from the natural flow of water without releasing any emissions or pollutants.
- It also does not rely on fossil fuels.
Environmental impact of hydropower
- Large-scale hydroelectric dams impact local ecosystems and communities
- They displace people and result in loss of habitat for fish and other wildlife.
- The building and maintenance of large hydroelectric dams have a significant environmental impact.
Himalaya and hydropower:
- They are a major water source for much of South Asia.
- Most countries in the region,including India, China, Nepal, Bhutan, and Pakistan.
- They have built or are planning to build hydropower projects in the Himalaya.
- In India: the government has identified hydropower as a key renewable energy source.
- Indian Himalaya:
- Subansiri Lower Hydroelectric Project in Arunachal Pradesh
- Teesta Low Dam Hydroelectric Project in Sikkim.
Nepal:
- It has identified hydropower as a major source of energy.
- It has many hydropower projects in the planning and development stages, including:
- Arun III Hydroelectric Project
- West Seti Hydroelectric Project.
Bhutan:
- Hydropower is the main source of revenue.
- The government has set a target to export surplus electricity to India.
- The country has built several hydropower projects:
- Chukha Hydropower Project
- Tala Hydropower Project.
Controversies about development of hydropower projects in the Himalayas:
- Environmental impacts — in Joshimath and other parts of Uttarakhand.
- Concerns about the potential conflicts over water resources in the region.
- The Himalaya is a fragile ecosystem and home to a diverse range of flora and fauna.
- It is threatened by deforestation, overgrazing, and construction activities that harm the environment and local communities that depend on it.
Negative Impact of dams:
- The construction of dams can disrupt the flow of rivers, leading to changes in water temperature and chemistry.
- It can cause erosion, landslides, and sedimentation which can have a negative impact on the local environment.
- Dams disrupt the migration patterns of fish and other aquatic species and impact the local wildlife, particularly if the dam’s construction leads to habitat loss.
- Large-scale hydroelectric dams displace local communities, affecting their livelihoods and cultural heritage and impacting the overall well-being of the local population.
Alternatives to hydropower:
Micro hydro:
- It is a small-scale hydroelectric power generation system that typically generates up to 100 kilowatts (kW) of electricity.
- These systems use the energy of falling water to turn a turbine, which, in turn, generates electricity.
- They can be used for various applications,including:
- powering homes
- businesses
- small communities.
- Micro hydro systems are less expensive to build and maintain than large hydroelectric dams
- They have a smaller environmental footprint.
- They can be located even in inaccessible areas where it is difficult to transmit electricity from larger power stations
- They can provide a reliable source of energy to communities that are not connected to the grid.
Micro hydro systems can be classified into two main types:
- Run-of-river systems use the natural flow of water in a stream or river to generate electricity.
- Storage systems use a reservoir to store water and release it as needed to generate electricity.
Way Forward
- Micro hydro systems can be tailored to minimize the ecosystem’s negative impact and provide sustainable energy solutions.
- Even micro-hydropower projects can have some impact on the environment and local communities.
- A detailed assessment should be carried out to evaluate the potential impact before proceeding with the project
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