What are the Big 5 controls?
The Big 5 controls represent a proposed set of rules that would require a limit of 0.15 lbs of NOx per million BTU produced at the five largest utility sources in NC that are located near air quality problem areas. The Big 5 facilities are: Duke Energy: Belews Creek located in Stokes County; Marshall located in Catawba County; Allen located in Gaston County ; CP&L: Roxboro located in Person County; Mayo located in Person County. No reductions beyond those in the Title IV acid rain requirements that must be met by 2007 would be required of other utility sources. One alternative to the Big 5 control strategy was to require a average limit of 0.25 lbs of NOx per million BTU produced for each of the two utility systems. The utility companies could decide how to meet the limit.
