Consider the following statements regarding hydroelectric power generation in India. Which of these statements are correct? 1. By April 2024, 15 GW of hydroelectric projects were under construction in India, and hydro capacity is expected to rise from 42 GW (operational) to 67 GW by 2031-32. 2. The fall in hydro power generation in 2023-24, compared to 2022-23, was largely due to less rainfall in the southern region and natural disasters (flash floods) in Himachal Pradesh and Eastern India. 3. Hydroelectric power has always played a key role in India's energy landscape, providing essential peaking support to the electricity grid. 4. The southern region contributes about 45% to India’s total hydroelectric power generation.