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CAIR Applicability

Electricity-Generating Units

Any stationary, fossil-fuel-fired boiler or stationary, fossil-fuel-fired combustion turbine serving at any time, since the later of November 15, 1990, or the start-up of the unit's combustion chamber, a generator with nameplate capacity of more than 25 megawatts of electricity (MWe), producing electricity for sale.

Non-Electricity-Generating Units

Note: DHEC has started the regulation development process to change the following definition. For more information, see the September 25, 2009 Notice of Drafting.

This category includes:

  1. Units that commenced operation before January 1, 1999, a unit that has a maximum design heat input greater than 250 British thermal units per hour (mmBtu/hr) and does not serve a generator that has a nameplate capacity greater than 25 MWe if any such generator produces an annual average of more than one-third of its potential electrical output capacity for sale to the electric grid during any three calendar year period.
  2. For units that commenced operation on or after January 1, 1999, a unit that has a maximum design heat input greater than 250 mmBtu/hr that:
    1. At no time served a generator producing electricity for sale; or
    2. At any time served a generator producing electricity for sale, if any such generator has a nameplate capacity of 25 MWe or less and has the potential to use no more than 50 percent of the potential electrical output capacity of the unit.

For more information, contact Maeve Mason, Regulation and SIP Management Section, Air Quality, at (803) 898-2230.