Analysis of 2007 Emissions from Power Plants and Other ... - MARAMA

March 2011Page 6Analysis of Emissions from Power Plants and Other Large Combustion Sources1 Types of Combustion Units and Fuels by Operating TimeWhat type of units generally fall into the three classifications? (For example, are theunits operating more than 50% of the time generally large coal fired boilers?) Whereinformation is available, this should be addressed both in terms of technology (e.g.,boiler vs. combustion turbine) and in terms of fuel (e.g., coal, oil, gas, diesel).We used CAMD 2007 annual or ozone season hours of operation data for calendar year2007 to classify electric generating units into three bins based on the percent of time thatthe unit operated. These three bins are defined as:> 50% - the unit operated more than 50 percent of the time during the period inwhich the unit was required to report (i.e., > 4,380 hours for 12-month reportingunits; > 2,196 hours for 6-month reporting units);15-50% - the unit operated between 15 and 50 percent of the time during the periodin which the unit was required to report; < 15% - the unit operated less than 15 percent of the time during the period inwhich the unit was required to report.The following charts provide descriptive statistics on unit counts, capacity, and emissionsfor these three classification bins by fuel type, combustion type, and NOx control type.These charts are for units in the MANE-VU+VA region.