The Energy required to deliver One Million Gallons of Clean Water from…
Lakes or Rivers 1,350 kilowatt-hours
Groundwater 1,700 kwh
Wastewater 2.250-3,500 kwh
Seawater 9,700-16,000 kwh
Fortunately, Gas/Steam, Coal and Oil and Nuclear used to draw their water from rivers and lakes. Today almost all energy suppliers are required to utilize cooling towers, which use 50% less water for (due to recycling) power generation.