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32 Preservation of the National Airspace System is an estab- lished, long-term objective. Where these two important objec- tives intersect new issues are raised and conflicts require assessment and resolution. Federal and state agencies have been working together on a number of fronts to increase new clean energy projects without negatively impacting airspace, a finite resource. The DoD worked closely with the FAA, Travis Air Force Base, the American Wind Energy Association, and individ- ual wind energy companies to study potential impacts of pro- posed wind farms in Solano County, California, on military readiness. One product of this work was the DoD's Wind FIGURE 22 Power Tower Abengoa Energy, Spain (courtesy: Farm Screening Tool, found on the OE/AAA website, which Dr. Clifford Ho, U.S. DOE, Sandia National Laboratories). enables wind developers to identify military conflicts early in the process. thermal plume that may produce an impact are limited. There- Presently, the FAA's Aircraft Flight Standards group is fore, it is suggested that specific field trials be conducted to working with the DOE, the DOE's Sandia National Laborato- measure impacts of thermal plume velocity on aircraft to ries, the Solar Energy Industries Association, and solar com- more specifically measure the risk. pany representatives to discuss issues of potential impacts associated with concentrated solar power facilities. CURRENT AGENCY PROGRAMS The FAA is also preparing an internal report on the poten- The development of indigenous, clean energy supplies is tial impacts of thermal plumes from air-cooled condensers an important, and relatively new, national policy initiative. associated with steam turbine generation.