While on the topic of water, it strikes me that it is another issue which is generally lacking in all the current media disputes and recent political debates on energy.
While we debate the merits of offshore drilling, clean coal, natural gas, and nuclear power, we seem to ignore the fact that all four of these require incredible amounts of water to sustain. This during the most severe world-wide water shortage in recorded history. According to the World Health Organization, 35% of the world’s population live in highly water stressed areas, and while we might arrogantly believe that this only effects those in the third world, we find not only Australia, but our southwestern U.S. of A. in the tally of critical drought sufferers (with many other states soon to enter the ranks). What allows us to seem so much better off in the global demand for water are the great luxuries of cheap energy and the extant infrastructure of the country, on which our society depends to alleviate the problem. However, these can only do so for a finite time period, one which is rapidly coming to an end. The triple-threat of rising energy prices, increasing populations, and dwindling supplies of water will very soon come to a head.
For one example: Las Vegas exists in the precarious situation of a desert city using drastic amounts of water to feed it’s opulence in greenery and fountains, drawing water from nearby Lake Mead. Meanwhile the lake is approaching water levels so low that it could soon lead the city to drastic water rationing, as well as a cease in operations at Hoover Dam, the primary source of electricity for the city. The situation is so dire that current projections of climate change and drought tell us the lake could be dry as soon as 2021. Even if the lake weren’t running out of water (and by extension, it’s electricity producing potential), the 123 megawatt-hours of energy required to get city it’s water for a single day is only going to get more expensive. And in a way, they’re lucky, because delivering water from a lake or groundwater is on the energy cheap side, currently about half as expensive as reclaiming waste water, and an 8th as expensive as our present methods of desalination from seawater.
On the energy side of the equation, realize that most of us in the U.S. of A depend not upon the hydro-electric power of a nearby dam for our energy, but instead on one of the 1,600 coal-fired plants in the country, the 900 natural gas plants, or the 300 nuclear power plants, all of which in turn depend heavily on water to make that electricity happen. To create 5 megawatt-hour of electricity (approximately enough to power 40 average U.S. homes for a year), the average coal or gas power plant must use 142,000 gallons of water. That is roughly equal to the yearly water use of 1.5 of those same average U.S. homes.
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To take that math a little further (with a lot of averaging), we find that a typical coal power plant produces roughly 1,216,552 megawatt-hours of electricity in a year. To put it another way, and accounting for the variations from plant to plant in water use, those 1,600 coal-fired plants in the country have an annual water use approximately equal to that of 2.4 billion people. No, that is not a typo. U.S coal fired electricity plants alone use more water than one third the world’s current population. That is, based on average U.S. of A water usage. To give a little perspective, UK water use per person is one third of ours, and people living in sub-Saharan Africa use as little as one sixth what we use (this disparity is just as much a result of our indulgence as it is their relative lack of access to water, potable or not, in this part of Africa).
Again, this is just coal plants, this doesn’t count the natural gas plants, which use 10-20 percent more water than coal plants, or nuclear power plants, which tend to use the most water, at about 2 times as much as coal plants. If these numbers are worrying, remember that China builds around 100 coal-fired electrical plants a year, adding to the more than 50,000 power plants worldwide.
According to the U.S. Geological Survey report on water usage from the year 2000, 30% of the water so used is saline, meaning it would have needed treatment (and energy) to be drinkable. It also shows, however, that of the total water withdrawals in the united states for that year, less than 1% was for domestic use. 11% was for public use, and 48% was for “thermoelectric power,” or cooling down the reactions in these power plants.
By contrast, Hydroelectric plants use 1% of the total U.S. of A water withdrawals, and naturally: solar and wind power use no water at all.
So, in addition to the clouds of sulfur and mercury giving us acid rain, the decapitated mountains, the greenhouse gas emissions of “dirty coal,” which scientists now agree are the leading cause of climate change, and worldwide breathing problems, add ‘drastic strain on water supplies’ to the list of cons against coal power.



