Energy Exchange

Energy-Water Nexus Spans Across Western United States

By Kate Zerrenner / Published: August 22, 2013

Source: feww.wordpress.com

Over the past few weeks, I’ve written a number of posts to help shed light on the fundamental connection between energy and water. Because many of our energy sources gulp down huge volumes of water, it’s imperative that we break down the long-standing division between energy and water planning — especially in drought-prone states like Texas. I’d like to take a step back and look at how Texas’ neighbors are addressing energy and water co-management. While Texas may be an extreme example, looking toward its immediate neighbors could provide ideas and best practices to improve the state’s situation.

A number of western states are facing many of the same challenges as Texas. Electricity production is a major drain on the region’s water supply. A study co-authored by Western Resource Advocates and EDF showed that thermoelectric power plants, such as coal, natural gas and nuclear, in Arizona, Colorado, New Mexico, Nevada and Utah consumed an estimated 292 million gallons of water each day in 2005 — roughly equal to the amount of water consumed by Denver, Phoenix and Albuquerque combined (and we’re talking water consumption, not just withdrawals). Like Texas, the western states face a future of prolonged drought. Scientific models predict climate change will increase drought throughout the Southwest, placing greater stress on the region’s delicate water supply.

Additionally, electricity production, numerous thirsty cities and widespread agricultural activity all strain the water system, too. Because so many flock to western states for fishing, kayaking, rafting and other recreational water activities, setting the region’s water system on a sustainable path is a critical economic issue. The exceptional challenges facing western states have already prompted some states to consider the energy-water nexus when planning to meet future water and electricity needs. Read More »

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Energy And Water Are Running Out In Texas, But It’s Not Too Late

By Kate Zerrenner / Published: August 8, 2013

As we’ve highlighted in previous posts, water and energy regulators often make decisions in silos, despite the inherent connection between these two sectors. Texas is no exception.

Two very important and intertwined events are happening in Texas right now.

First, the state is in the midst of an energy crunch brought on by a dysfunctional electricity market, drought, population growth and extreme summer temperatures. An energy crunch signifies that the available supply of power barely exceeds the projected need (or demand) for electricity. Texas’ insufficient power supply makes the whole electricity system vulnerable to extreme weather events. An especially hot day (with thousands of air conditioning units running at full blast) could push the state over the edge and force the Electric Reliability Council of Texas (ERCOT), the institution charged with ensuring grid reliability, to issue rolling blackouts.

Second, Texas is still in the midst of a severe, multi-year drought, forcing state agencies to impose strict water restrictions throughout the state. The drought has already had a devastating impact on surface water and many communities are facing critical water shortages.

Although Texas has always had to deal with extreme weather events, we can anticipate even more intense weather as climate change advances. The new climate ‘normal’ makes extreme heat waves, like the historic 2011 Texas summer, 20 times more likely to occur. These extreme weather events heighten the urgency of the energy-water nexus. Read More »

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Where Is All Of The Water Going? A Look At Which Energy Resources Are Gulping Down Our Water

By Kate Zerrenner / Published: July 25, 2013

If you’re like so many conscientious consumers, you’ve experienced the disappointment that comes when you realize the lean turkey breast you bought has 300% of your daily value of sodium, negating the benefits of its high-protein and low-fat content.  Instantly, food choices feel more complex; you’ve learned the hard way that the pursuit of a low-fat diet is not the same as a healthy diet.

The Energy-Water Nexus shows us that our energy choices are much like our food choices: The environmental benefits of an energy diet low in carbon emissions might be diminished by increased water consumption (or waste), and the unforeseen tradeoffs between the two resources (i.e. more sodium in lieu of less fat, can hurt us in the long run).

Water Intensity

As we have mentioned before, roughly 90% of the energy we use today comes from nuclear or fossil fuel power plants, which require 190 billion gallons of water per day, or 39% of all U.S. freshwater withdrawals (water “withdrawal” indicates the water withdrawn from ground level water sources; not to be confused with “consumption,” which indicates the amount of water lost to evaporation.)

Read More »

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It’s Time Our Policies Reflect The Fact That Energy And Water Are Fundamentally Intertwined

By Kate Zerrenner / Published: July 11, 2013

When I tell people that the best way to conserve energy is to conserve water, I am often faced with a confused response.  I’m not surprised really.  Energy and water policies are rarely discussed in the same forum.  For a long time, we’ve overlooked the inextricable relationship between water and energy use.  Coal, nuclear and natural gas plants use enormous amounts of water for cooling purposes.  In 2005, 41% of all freshwater withdrawals in the nation was used in the thermoelectric power industry for cooling.

Connection between energy and water

The longstanding division between energy and water considerations is particularly evident in the case of energy and water management.  These resources are fundamentally intertwined: Energy is used to secure, deliver, treat and distribute water, while water is used (and often degraded) to develop, process and deliver energy.  Despite the inherent connection between the two sectors, energy and water planners routinely make decisions that impact one another without adequately understanding the scientific or policy complexities of the other sector.  This miscommunication often hides joint opportunities for conservation to the detriment of budgets, efficiency, the environment and public health, and inhibits both sectors from fully accounting for the financial, environmental or social effects they have on each other.

This lack of collaboration between energy and water planners is especially dire considering Texas is in midst of an energy shortage that is exacerbated by the multi-year drought.  Without adequate planning, we could someday have to choose between keeping our lights on and turning on the faucet. Read More »

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New Thinking Is Critical To Better Manage Water And Electricity Resources In Texas

By Kate Zerrenner / Published: March 28, 2013

Central Texas Workshop Discusses Opportunities For Resiliency During Extreme Weather Events

This commentary was originally posted on our Texas Clean Air Matters blog.

Last week, I attended a regional workshop that focused on adapting to extreme events, sponsored by the U.S. Environmental Protection Agency (EPA), the National Oceanic and Atmospheric Administration, the Water Environment Research Foundation, the Water Research Foundation, Concurrent Technologies Corporation, and Nobilis. This workshop was the sixth in a series organized around the country to determine what is needed to increase the resilience of water utilities and communities in the face of extreme weather events. While the focus was on water, time and again, electricity was brought into the conversation—the two are closely linked, and in Texas, a state facing shortages of both water and power, this will require some creative thinking on our part.

This workshop focused on Central Texas, in particular our drought. But as the two-day workshop went on, it became clear to the organizers when local water utilities and other stakeholders spoke, that drought was only one extreme event that Texas has had to deal with…and continues to deal with. We are a state of extremes—weather, politics, personalities—and we not only have drought to handle, but also hurricanes, floods, tornadoes, wildfires, and just generally scorching heat. One of the first speakers was John Nielson-Gammon, the State Climatologist based out of Texas A&M University. He confirmed that while these natural phenomena are not new to Texas, we are experiencing more intense weather events. Last year was one of the hottest in Texas since we started recording temperatures, and we are heading into the third year of a pretty gruesome drought. Not being prepared for extreme events to get worse seems pretty foolhardy.

During the workshop, we heard from a variety of speakers from around the Central Texas region, including from the Barton Springs/Edwards Aquifer Conservation District, the Lower Colorado River Authority, rice growers, the University of Texas, the high tech industry, and individuals from Austin, San Antonio, and Bastrop. These people are dealing first hand with the impacts of the extreme events we’ve had in the past few years. They are simultaneously trying to manage the current situation while planning for what the changing climate means in the coming years. It’s a difficult balancing act.

Read More »

Also posted in Energy Efficiency, Texas / Comments are closed

When We Save Energy In Texas, We Also Save Water

By Kate Zerrenner / Published: February 13, 2013

Last week, the Texas Coalition for Water, Energy and Economic Security (TCWEES), of which EDF is a member, held a legislative briefing at the Texas Capitol titled Energy & Water, Dollars & Sense: Improving security and maximizing benefits to Texas businesses and residents. The briefing focused on the nexus of water and energy, and furthered the idea that where you save energy, you save water too. The briefing included a panel discussion and a question and answer session.

State Representative Lyle Larson from San Antonio welcomed attendees, a speaker that is well-suited to talk about water issues. Before becoming a state legislator, he served on San Antonio’s City Council, a city with one of the best water conservation programs in the country. Representative Larson started with an interesting point: In addition to the physical issues of water scarcity, we also need to resolve the psychological issues of water resources.

People simply do not think of water as a scarce resource, despite the multi-year droughts we’ve seen in Texas. Addressing water scarcity has been done in much the same way as system-wide power shortages: in a short term, reactive way, rather than a long term, proactive way. And we will never be able to meet our energy or water needs of our growing populations by being short-sighted.

Representative Larson said that water is the number one impediment to business no matter where you are in the world. Water-rich countries will take American jobs if we can’t address our scarcity, and water-rich states will take Texan jobs. We don’t deploy best management practices in this state when it comes to water. And calling for more water infrastructure is great, but conservation is going to save significantly more water than new infrastructure will. Read More »

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