|Table 4.4. Existing Capacity by Producer Type, 2012 (Megawatts)|
|Producer Type||Number of Generators||Generator Nameplate Capacity||Net Summer Capacity||Net Winter Capacity|
|Electric Power Sector|
|Independent Power Producers, Non-Combined Heat and Power Plants||6,148||412,045||374,964||389,349|
|Independent Power Producers, Combined Heat and Power Plants||609||39,916||35,266||38,023|
|Commercial and Industrial Sectors|
|Notes: In 2011, EIA corrected the NAICS codes of several plants which resulted in a net capacity shift from the electric utility sector to the commercial sector.
See Glossary reference for definitions.
Totals may not equal sum of components because of independent rounding.
In the case of some wind, solar and wave energy sites, the capacity for multiple generators is reported in a single generator record and is presented as a single generator in the generator count.
Capacity by energy source is based on the capacity associated with the energy source reported as the most predominant (primary) one, where more than one energy source is associated with a generator.
Source: U.S. Energy Information Administration, Form EIA-860, 'Annual Electric Generator Report.'