With pumps, aeration diffusers, motors, and blowers running 24/7, the water sector naturally accounts for a great deal of total energy use and thereby greenhouse gas (GHG) emissions. From a U.S. perspective, the EPA estimates that the U.S. water stream accounts for 45 million tons of GHG annually, with energy use corresponding to 2 percent of national consumption. On an economic level, energy consumption related to operating wastewater and water plants, on average, accounts for approximately 35 percent of a typical U.S. municipality’s energy budget.
Source: wateronline.com