Table 4.9. Total Capacity of Distributed and Dispersed Generators by Technology Type,
2005 through 2012

  Capacity (MW)  
Year Internal Combustion Combustion Turbine Steam Turbine Hydro Wind Photovoltaic Storage Other Wind and Other Total Number of Generators
Distributed Generators
2005 4,025.0 1,917.0 1,830.0 999.0 -- -- -- -- 995.0 9,766.0 17,371
2006 3,646.0 1,298.0 2,582.0 806.0 -- -- -- -- 1,081.0 9,411.0 5,044
2007 4,624.0 1,990.0 3,596.0 1,051.0 -- -- -- -- 1,441.0 12,702.0 7,103
2008 5,112.0 1,949.0 3,060.0 1,154.0 -- -- -- -- 1,588.0 12,863.0 9,591
2009 4,339.0 4,147.0 4,621.0 1,166.0 -- -- -- -- 1,729.0 16,002.0 13,006
2010 886.8 186.0 109.9 97.4 98.9 236.3 -- 372.7 -- 1,988.0 15,630
2011 791.1 115.5 64.9 97.9 36.7 314.8 0.2 264.3 -- 1,685.4 20,941
2012 756.1 105.8 60.2 119.9 252.9 543.7 15.2 324.4 -- 1,990.6 28,252
Dispersed Generators
2005 4,290.0 335.0 126.0 2.0 -- -- -- -- 13.0 4,766.0 11,373
2006 6,524.0 346.0 157.0 3.0 -- -- -- -- 8.0 7,037.0 9,536
2007 7,866.0 268.0 102.0 31.0 -- -- -- -- 30.0 8,297.0 11,057
2008 9,335.0 86.0 248.0 34.0 -- -- -- -- 70.0 9,773.0 12,262
2009 9,751.0 329.0 204.0 81.0 -- -- -- -- 108.0 10,475.0 13,928
2010 2,771.2 64.4 13.8 8.4 6.3 95.2 7.0 17.9 -- 2,984.2 16,874
2011 2,916.9 40.3 14.6 6.0 3.2 2.7 8.0 7.9 -- 2,999.6 14,123
2012 3,180.9 49.8 -- 2.2 3.1 8.5 7.7 13.5 -- 3,265.5 14,557
Distributed and Dispersed Generators
2005 8,315.0 2,252.0 1,956.0 1,001.0 -- -- -- -- 1,008.0 14,532.0 28,744
2006 10,170.0 1,644.0 2,739.0 809.0 -- -- -- -- 1,089.0 16,448.0 14,580
2007 12,490.0 2,258.0 3,698.0 1,082.0 -- -- -- -- 1,471.0 20,999.0 18,160
2008 14,447.0 2,035.0 3,308.0 1,188.0 -- -- -- -- 1,658.0 22,636.0 21,853
2009 14,090.0 4,476.0 4,825.0 1,247.0 -- -- -- -- 1,837.0 26,477.0 26,934
2010 3,658.0 250.4 123.7 105.8 105.2 331.5 7.0 390.6 -- 4,972.2 32,504
2011 3,708.0 155.8 79.5 103.9 39.9 317.5 8.2 272.2 -- 4,685.0 35,064
2012 3,937.0 155.6 60.2 122.1 256.0 552.2 22.9 337.9 -- 5,256.1 42,809

Distributed and Dispersed generator data in 2005 include a significant number of generators reported by one respondent, which may be for residential applications.
Prior to 2010, data contains generators over and under 1 MW, from 2010 forward, data contains only generators under 1 MW.
Distributed generators are commercial and industrial generators which are connected to the grid. Dispersed generators are commercial and industrial generators which are not connected to the grid. Both types may be installed at or near a customer`s site, or at other locations. They may be owned by either the customers of the distribution utility or by the utility. Other includes generators for which technology is not specified.
Totals may not equal sum of components because of independent rounding.
Source: U.S. Energy Information Administration, Form EIA-861, "Annual Electric Power Industry Report."