Facts and figures
The Facts and Figures in this section are drawn from the upcoming edition of the World Water Development Report on Water and Energy that will be published in March 2014 and launched on the occasion of World Water Day celebrations in Tokyo, Japan.
Hydroelectricity is the largest renewable source for power generation and its share in total electricity generation is expected to remain around 16% through 2035.
Hydropower and water use
Most of the water used for hydropower generation is returned to the river though some evaporates and there are important impacts on timing and quality of streamflows.
Industrial water use
Roughly 75% of all industrial water withdrawals are used for energy production.
For developing countries alone $103 billion per year are required to finance water, sanitation and wastewater treatment through 2015.
Energy for water
Energy is required for two components of water provision: pumping and treatment (before and after use).
Waterborne transit is one of the most energy efficient. Inland towing barges are more than 3 times more energy efficient than road trucks and 40% more efficient than rail.
Biogas produced from sewage
In Stockholm, public buses, waste collection trucks and taxis run on biogas produced from sewage treatment plants.
Access to water and sanitation
In 2011, 768 million people did not use an improved source of drinking-water and 2.5 billion people did not use improved sanitation.
Access to electricity
More than 1.3 billion people still lack access to electricity, and roughly 2.6 billion use solid fuels (mainly biomass) for cooking.
Wind power is the most sustainable source of renewable energy, mainly because of its low greenhouse gas emissions and water consumption.