The current largest hydroelectric dam in the world is the Three Gorges Dam in China. It can generate 22.5GW (40% more power than the dam in 2nd place, which is also Chinese).

Since Jan 2024, China has on average constructed 23GW of new solar power every month. So China has effectively been adding a "world's largest dam" worth of solar power, every single month for the last 24 months.