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Understanding the Current Science, Regulation, and Mitigation of Shadow Flicker: A NEWEEP Webinar

Feb. 10, 2011

This webinar included a panel of experts in the fields of visual assessment, landscape architecture, and environmental planning with a question and answer session. The webinar was designed for attendance by the general public, local officials, state regulators, facility siting decision-makers, policy-makers, and others interested in a review of objective information on the impacts of wind energy.


  • Thomas Priestley (PDF 7.2 MB), Senior Environmental Planner, CH2M Hill
  • Matthew Allen (PDF 1.5 MB), Principal, Saratoga Associates
  • Richard Lampeter (PDF 299 KB), Senior Scientist, Epsilon Associates

Discussion Topics

The presentations and discussion provided webinar participants with an understanding of:

  • What shadow flicker is, and how it is created;
  • The methodologies used to forecast when, where, and how much shadow flicker will occur;
  • How forecasted data are analyzed to estimate the potential impact on nearby receptors;
  • The current landscape of state and local regulations, ordinances and guidance documents, and their role in the wind project permitting process;
  • Available mitigation and management practices; and,
  • Areas in need of additional research and analysis.

Audio and text versions of the webinar are available (WMV 16.4 MB) Download Windows Media Player. Time: 02:04:03. Text Version.