Did you know? 100,000 gallons of water required to produce 1 Mwh!

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Running water

A new report says American businesses and policymakers are not fully realizing that huge water demands are a major hidden cost that cannot be overlooked.

Synapse Energy Economics has released a report, prepared for the non-profit organizations: Civil Society Institute (CSI) and the Environmental Working Group (EWG).

The report is titled “The Hidden Costs of Electricity: Comparing the Hidden Costs of Power Generation Fuels”. It examined the six fuels used to generate electricity — biomass, coal, nuclear, natural gas, solar (photovoltaic and concentrating solar power), and wind (both onshore and offshore). They were analyzed in the following categories: water impacts, climate change impacts, air pollution impacts, planning and cost risk, subsidies and tax incentives, land impacts, and other impacts.

Some examples of the water-related findings are below:

  • Nuclear power has critical cooling requirements that require huge amounts of water. Roughly 62 percent of U.S. nuclear plants have closed-loop cooling systems. Reactors with closed-loop systems withdraw between 700-1,100 gallons of water per megawatt hour (MWh) and lose most of that water to evaporation.
  • In addition to fouling streams and drinking water through mining and coal-ash dump sites, coal-fired power relies heavily on closed-loop cooling systems which withdraw between 500 and 600 gallons of water per MWh and lose most of this via evaporation. Withdrawals for open-looped cooled coal-fired power plants are between 20,000-50,000 gallons per MWh. Most of the water is returned, but at a higher temperature and lower quality.
  • Under a so-called “Clean Energy Standard,” biomass would become a much larger source of U.S. electricity generation; however, biomass also requires vast amounts of water. The report notes that a typical 50 megawatt (MW) biomass plant could withdraw roughly 242 million gallons of water per year and lose most of this. Adding 10 of these plants in a region would use 2.42 billion gallons of water per year.

Grant Smith is a senior energy analyst with the Civil Society Institute. He says many institutions are overlooking the strain that new projects will have on our already scarce water sources:

“The government and energy industries are literally flying blind as they plan for continued reliance on coal, natural gas, nuclear power and industrial biomass to meet our energy needs. Each of these is water intensive and leads to pollution of water, which is increasingly scarce and in competition for other uses such as agriculture and other commercial uses. The drought intensifies the urgency and the imperative that political leaders in both parties hit the pause button on the headlong rush to support nuclear power and fossil fuel use.”

Meanwhile, Seth Sheldon is a lead water/energy analyst. He criticizes the U.S. government for its response:

“In 2005 the Congress mandated a federal water/energy roadmap. Nearly eight years later, that roadmap has not been produced and either through bureaucratic inertia or fear of hard political questions, the questions are not even being asked, much less their solutions explored. At a time of significant water scarcity and increasing threats to water quality, we can ill afford to ignore this central question about the future of our energy choices.”

Other water-related data highlighted in the report includes the following:

  • The full picture for nuclear power water use may be even more dramatic. Estimates of lifecycle water use for three European reactors range from 2,600 to 6,900 gallons per MWh, not including cooling water use.
  • Coalbed methane recovery of natural gas depletes ground water: one estimate puts total groundwater removed between 1997 and 2006 at an astounding 172 billion gallons.
  • Estimates of the lifecycle water withdrawals from wind projects, including both onshore and offshore projects, range from just 55 to 85 gallons per MWh.

The full report is available online at: CivilSocietyInstitute.org