The question asks which renewable energy source contributes the largest share to India's total estimated potential of renewable power as of March 2025, according to Energy Statistics India 2025. The options provided are Solar energy, Hydro power, Wind energy, and Biomass energy.

According to the most recent and comprehensive data from Energy Statistics India, which examines various energy sources and their contributions, Wind energy holds the largest share among renewable energy sources in India.

Let's analyze each option:

• Solar energy: This is a rapidly growing sector in India with significant potential, particularly given India's geographical position. However, while important, it does not currently lead in terms of total potential capacity.
• Hydro power: India has a considerable potential for hydroelectric power, but this has been largely tapped, and growth is not as rapid as wind or solar.
• Wind energy: As per recent reports and data, including that from Energy Statistics India 2025, Wind energy contributes the largest potential. This is due to India's long coastline and favorable wind patterns, making it a prime location for wind energy development.
• Biomass energy: While it is a viable renewable energy source, its potential is not on the scale of wind or solar energy in India.

Hence, based on current data and reports, Wind energy is identified as the renewable energy source with the largest share of India's total estimated potential of renewable power.

Therefore, the correct answer is: Wind energy.