Electromagnetic Interference

Studies in the United States and Britain have concluded that wind turbines may interfere with radar systems. In a last-minute amendment to the National Defense Authorization Act for Fiscal Year 2006, Congress mandated that the Secretary of Defense submit a report to Congress on the effects of wind farms on military readiness and specifically whether wind facilities interfere with Long Range Surveillance Radar, often called Air Defense radar. On September 27, 2006, the DoD published its report, The Effect of Windmill Farms on Military Readiness. The report concluded that wind farms located within radar line-of-sight of an air defense radar facility may degrade the ability of the radar to perform its intended function. This impact is essentially due to "shadowing" and increased "clutter" caused by the mere presence of the turbine structures and the rotational movement of the turbine blades. The magnitude of the impact, according to the report, depends upon the number and location of the turbines.

Consultation with a number of federal agencies that have jurisdiction over radar systems is often part of obtaining regulatory approvals. As

Since most turbines exceed the 200-foot height criterion, and therefore trigger FAA review, developers must understand and comply with applicable FAA regulations.

The DOE Federal Wind

The DOE Federal Wind

Siting Information Center provides information on agency efforts to develop analytical tools, collect test data, and create solutions to mitigate the impact of wind turbines on advanced radar systems.

part of its hazard determination described in Section 4.1.5, the FAA engages other agencies to review a project that has filed an NPC and provide feedback on the potential for the project to obstruct military radar. The FAA would also conduct internal evaluations for complications to FAA radar systems. The National Telecommunications and Information Administration (NTIA) Interdepartment Radio Advisory Committee (IRAC) also provides federal agencies the opportunity to comment on potential radar issues, as discussed in Section 5.9.1. The National Weather Service is another federal agency that operates a radar system, the National Weather Service Next Generation Weather Radar (NEXRAD).

Consultants that are familiar with FAA regulations and DOD radar concerns can conduct screening analyses to examine the potential for interference with federal radar. Consultation with agencies such as the FAA and NTIA early in the development process may also identify potential impacts to radar systems. However, the FAA and NTIA consultation processes do not entirely eliminate the potential for protest. Standardized consultation procedures need to be established, and developers should stay apprised of improvements as the process evolves.

The FAA Long Range Radar Tool is publicly available for the initial evaluation of the potential to obstruct Air Defense and Homeland Security radar.

Renewable Energy Eco Friendly

Renewable Energy Eco Friendly

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable.

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