The global hydropower market is expected to grow at a CAGR of 4.1% from 2014 to 2020. Hydropower is one of the oldest sources of energy which was used thousands of years ago - to turn paddle wheels that help grind grain. Hydropower is a versatile, sustainable technology and it is the world’s largest source of renewable energy and currently accounts for about 20% of the world&#x27;s total electricity supply.