Explanation: Hydel projects, or hydroelectric power plants, are facilities that generate electricity by harnessing the energy of flowing or falling water. These projects are crucial for power generation in regions with abundant water resources, such as mountainous areas with rivers and streams. Himachal Pradesh, located in the northern part of India, is particularly well-suited for hydel projects due to its mountainous terrain and numerous rivers.
An underground hydel project is a specialized type of hydel project where the powerhouse and other critical components are located underground. This design offers several advantages, including reduced environmental impact, improved efficiency, and protection from natural disasters. The underground design also helps in minimizing the visual impact on the landscape and can be more cost-effective in certain geological conditions.
Asia's first underground hydel project is located in Himachal Pradesh, specifically at Nathpa Jhakri. The Nathpa Jhakri Hydel Project is a 150 MW underground power station that was commissioned in 2003. It is a significant milestone in hydel power generation, showcasing the innovative approach to power generation in mountainous regions. The project involves diverting water from the Satluj River through a tunnel to the underground powerhouse, where the water's energy is converted into electricity.
The project at Nathpa Jhakri is a testament to the engineering and technological advancements in hydel power generation. It has set a precedent for future underground hydel projects in India and other parts of the world. The project's success has also highlighted the potential of underground hydel projects in maximizing power generation while minimizing environmental disruption.
In conclusion, Himachal Pradesh is the correct answer as it is the location of Asia's first underground hydel project, the Nathpa Jhakri Hydel Project. This project exemplifies the state's role in pioneering innovative hydel power generation techniques and its commitment to sustainable energy solutions.