This document discusses vibration monitoring in hydropower plants. It begins by introducing hydropower as a renewable energy source and notes that vibration of equipment has long been a problem. It then discusses various sources of vibration in hydropower plants, including electrical, mechanical, and hydraulic vibration. Rotating equipment like turbines and motors as well as non-rotating equipment can experience vibration issues. Online and offline vibration monitoring techniques are used to examine equipment performance and identify faults. The advantages of online monitoring include reduced operation and maintenance costs, safety improvements, informed replacement decisions, and improved equipment life and efficiency.