Why the Best Way to Save Water Is to Use Less Energy (and Vise Versa)

Photo Credit: srv0

California likes to think of itself as being ahead of the curve. So when the state set out to reduce greenhouse gas emissions, regulators did all the right things - stringent tailpipe standards for cars, tighter codes for buildings, higher renewable energy standards for utilities. Then they took one of the most aggressive energy-saving steps of all.

They started a campaign to save water.

The link between energy and water is not always apparent, but the two are as intertwined as the hydrogen and oxygen atoms in a bottle of Evian.

By now, everyone knows you save energy by turning out lights. And you conserve water by taking shorter showers. But it's just as true that saving water may be one of the most effective ways to save energy - and vice versa. "It's a 'buy one, get one free' deal," said Douglas Kenney, a professor at the University of Colorado Law School and the editor of an upcoming book that explores the nexus of water and energy.

In California today, just delivering water accounts for 20 percent of the state's energy consumption. It takes power to gather water, purify water, and distribute water, especially in places like southern California where water is piped hundreds of miles to supply Los Angeles' sprawling demands. Nationally, energy production sucks more water from freshwater sources than any other sector except agriculture. It takes water to create the power we use to drive our cars, transport our groceries, and run our toaster ovens. Virtually every source of electricity in a typical American home or manufacturing plant - whether it comes from hydroelectricity, coal, natural gas, nuclear, biofuels, or even concentrated solar -- also requires water. Lots of water.

That's a growing problem, because in many places, finding water for energy isn't easy - and it's bound to get tougher as energy demands soar and climate change alters hydrological cycles in already arid regions. The energy sector is the fastest-growing water consumer in the United States, according to a January 2011 Congressional Research Service report. Nationally, that's a challenge, but regionally it could be a calamity. As the Congressional Research report notes, "much of the growth in the energy sector's water demand is concentrated in regions with already intense competition over water."

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The connection between energy and water - and the precariousness of that link in the western United States - is exemplified in a gigantic plug of concrete stopping the muddy Colorado River above Las Vegas, otherwise known as Hoover Dam. At the ceremony inaugurating the Depression-era public works project in 1935, then-Interior Secretary Harold Ickes noted proudly, "no better understanding of man cooperating with nature can be found anywhere."

Hoover Dam provided the two key ingredients - water and power - that freed the Southwest and southern California to go on a 75-year growth spurt. Lake Mead now supplies water to more than 22 million people, and it produces more than four billion kilowatts of electricity per year.

But Ickes likely never imagined how quickly man's cooperation with nature would disintegrate in the 21st century. In the American West, a burgeoning population created a double-whammy of surging power demands and dwindling freshwater supplies. The Colorado River, lifeblood of seven western states, is already as overdrawn as the federal treasury. Drought conditions during most of the 21st century have forced water managers to plan for a day when the region's vast system of dams and reservoirs no longer have enough water to store. Already, utilities have to scramble to respond on days when everybody in Phoenix, Las Vegas and Los Angeles wants to crank their air conditioners during the same heat wave.