The government promotes rooftop solar installations in Arunachal Pradesh to:

The correct answer is: d) All of the above

Rooftop solar installations in Arunachal Pradesh are promoted by the government to reduce dependence on the grid, supplement existing power supply, and promote clean energy.

• Reduce dependence on the grid: Rooftop solar panels can generate electricity for a home or business, which can reduce the amount of electricity that needs to be purchased from the grid. This can save money on energy bills and also help to reduce the strain on the grid.
• Supplement existing power supply: Rooftop solar panels can also be used to supplement existing power supply. This can be helpful during times of peak demand, when the grid is under strain. Rooftop solar panels can help to reduce the amount of electricity that needs to be drawn from the grid during these times.
• Promote clean energy: Rooftop solar panels are a clean source of energy. They do not produce any emissions, which can help to improve air quality and reduce greenhouse gas emissions.

Overall, rooftop solar installations in Arunachal Pradesh are a beneficial way to reduce dependence on the grid, supplement existing power supply, and promote clean energy.