The correct answer to the question is option 2: Chamera-I. Chamera-I is a hydroelectric power project developed by the National Hydroelectric Power Corporation (NHPC). It has the largest power generation capacity (installed) compared to the other options listed.

However, let`s briefly describe each option to understand their significance:

1. Baira-Siul: This is a hydroelectric power project developed by the NHPC located in Himachal Pradesh, India. It is an important power generation project but does not have the largest power generation capacity.

2. Chamera-I: This project, also developed by NHPC, holds the distinction of having the largest power generation capacity (installed) among the listed options. Chamera-I is located in Himachal Pradesh and contributes significantly to the power generation in the region.

3. Loktak: Loktak is a lake in Manipur, India. While it is an important natural resource and a source of hydropower, it is not a specific project developed by NHPC.

4. Salal: Salal is a hydroelectric power project developed by NHPC located in Jammu and Kashmir, India. Although it is an important power generation project, it does not have the largest power generation capacity compared to