Number of U.S. spas (2007): 14,615
Revenue (2006): $9.4 billion, down 3 percent from previous year
Spa visits (2006): 110 million, a decline of 16 percent from previous year
Active spa-goers: 32 million
In total: 1 in 4 Americans has been to a spa
Employees: 234, 600 (118,00 full-time; 73,600 part-time; 42,900 contract)
Top growth areas by spa type: Medical (19%), resort/hotel (16%), destination (13%)
Source: International Spa Association
Just as Lawrence Kazmerski, a top official at the National Renewable Energy Laboratory, was about to give the keynote address at the University of Minnesota's annual E3 conference at the RiverCentre in St. Paul, the lights went out, bathing the audience in darkness and a deep sense of irony.
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