The United States needs around 731,920 million litres a day (161,000m gallons) to produce and burn the nearly 900m tonnes of coal it uses each year to generate just a third of the nation’s electricity.
In India, plans to produce 500 gigawatts of coal-fired electricity by 2040, will require at least 58bn cubic metres per year (pdf). And in China, about 15% of national water withdrawals are used for coal mining, processing, ash control, and for cooling of its coal-fired power plants.
Where will all this water come from?
Global energy consumption is forecast to increase nearly 50% by 2040, driven mostly by emerging economies such as China and India. Energy strategies based on fossil fuels will require much more water to be allocated to new power plants.
from The Guardian https://www.theguardian.com/global-development-professionals-network/2017/jan/16/water-energy-food-challenge-davos