Table 4. All-green utilities establishments: employment, percent of total employment, and annual mean 
wages for the largest occupations, November 2011

-------------------------------------------------------------------------------------------------------
                                                                   |              |           |        
                            Occupation                             |              | Percent of|  Annual
                                                                   |Employment (1)|   total   |   mean 
                                                                   |              | employment| wage (2)
-------------------------------------------------------------------------------------------------------
                                                                   |              |           |        
All occupations (3) ............................................ ..|    142,030   |    100.0  | $62,500
  Water and wastewater treatment plant and system operators .......|     20,200   |     14.2  |  44,560
  Nuclear engineers ...............................................|      8,170   |      5.8  |  96,270
  Security guards .................................................|      5,270   |      3.7  |  43,580
  Industrial machinery mechanics ..................................|      5,100   |      3.6  |  61,830
  Power plant operators ...........................................|      4,530   |      3.2  |  57,620
  Nuclear power reactor operators .................................|      4,380   |      3.1  |  77,660
  First-line supervisors of production and operating workers ......|      4,020   |      2.8  |  69,930
  Maintenance and repair workers, general .........................|      3,880   |      2.7  |  47,180
  Nuclear technicians .............................................|      3,630   |      2.6  |  75,370
  Office clerks, general ..........................................|      3,520   |      2.5  |  37,640
                                                                   |              |           |        
-------------------------------------------------------------------------------------------------------

   1 GGS-OCC data for utilities include the following North American Industry Classification
System (NAICS) industries: Hydroelectric power generation (NAICS 221111), Nuclear electric power
generation (NAICS 221113), Other electric power generation (NAICS 221119), Water supply and irrigation
systems (NAICS 221310), Sewage treatment facilities (NAICS 221320), and Steam and air-conditioning
supply (NAICS 221330). For more information on the industry scope for the GGS-OCC estimates, see the
Technical Note.

   2 Annual wages have been calculated by multiplying the hourly mean wage by a "year-round,
full-time" hours figure of 2,080 hours; for those occupations where an hourly mean wage is not
published, the annual wage has been directly calculated from the reported survey data.

   3 Occupations listed will not sum to all-occupations total because the total includes
occupations for which data are not shown.

   NOTE: Data represent occupational employment and wages for establishments that received 
all of their revenue from green goods and services. Establishments that did not generate
revenue, such as government establishments, nonprofits, or startups without positive revenue,
reported all of their employment associated with the production of green goods or provision
of green services.