UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

REGION III

	1650 Arch Street

	Philadelphia, Pennsylvania  19103

DATE:	January 25, 2008

SUBJECT:	Technical Support Document - Delaware; Regulation No. 1144 –
Control of Stationary Generator Emissions 

			/s/

FROM:	Rose Quinto, Environmental Engineer

Air Quality Planning Branch 

TO:		File

			/s/

THRU: 	Cristina Fernandez, Chief

Air Quality Planning Branch

A.  BACKGROUND

On November 1, 2007, the Delaware Department of Natural Resources and
Environmental Control (DNREC) submitted a SIP revision that consists of
Delaware’s regulation for controlling stationary generator emissions
(Regulation No. 1144 – Control of Stationary Generator Emissions). 
Regulation No. 1144 will impact any owner of stationary generator,
except the owner of any:  mobile generator, residential generator for
emergency use only; certain generators whose emissions are already well
controlled; or generators with a standby power rating of ten kilowatts
or less.  The effective date of this regulation is January 11, 2006.

Delaware is not in compliance with the National Ambient Air Quality
Standards (NAAQS) for ozone and fine particulate matter (PM2.5).  DNREC
developed a regulation to control the air emissions from on-site
electric generating units such as emergency generators, as well as
generators typically known as distributed generation (DG) units.  DG is
a small, on-site fossil fuel-fired unit, but can encompass a much larger
world of electric generation.  These fossil fuel-fired generators emit
much higher rates of air contaminants per kilowatt hour and contribute
to the formation of ground-level ozone and fine particulate matter.  The
purpose of Regulation No. 1144 is to help ensure that the air emissions
from new and existing stationary generators do not cause or contribute
to these existing air quality problems.  

B.  STATE SUBMITTAL

Regulation No.1144 applies to new, existing, emergency, and distributed
stationary generators, except for:  

A generator covered by a permit which imposes a NOx emission limitation
established to meet Best Available Control Technology (BACT) or Lowest
Achievable Emission Rate (LAER);

An emergency generator located on a residential property where no
commercial or industrial activity is carried on, and operated solely to
provide emergency electric power to the domestic residence and
structures on that property housing no more than three families;

A generator which is mobile;

A generator with a standby power rating of 10 kW or less; or

Existing, emergency, stationary generators installed at the stations of
the member companies of Delaware Volunteer Firemen’s Volunteer
Association.

Regulation No. 1144 contains provisions to control the emissions of
nitrogen oxides (NOx), nonmethane hydrocarbons (NMHC), particulate
matter (PM), sulfur dioxide (SO2), carbon monoxide (CO), and carbon
dioxide (CO2) from stationary generators in the State of Delaware.

Regulation No. 1144 establishes emission standards in pounds per
megawatt-hour (lbs/MWh) of electricity output under full load design
conditions or at the total load conditions specified by the applicable
testing methods.  

Regulation No. 1144 establishes operating requirements of emergency and
distributed generators. An emergency generator will operate for
unlimited number of hours during an emergency, and during testing or for
maintenance purposes before 5 pm on a day which has a Ground Level Ozone
Pollution Forecast or Particle Pollution Forecast of “Code Red” or
“Code Orange” as announced by DNREC.  A distributed generator will
operate at any time except as restricted also before 5 pm on a day which
has a Ground Level Ozone Pollution Forecast or Particle Pollution
Forecast of “Code Red” or “Code Orange” as announced by DNREC. 
An emergency generator will be tested on any day as required by the
National Fire Protection Association (NFPA) or Joint Commission on
Accreditation of Healthcare Organizations (JCAHO) standards.

Regulation No. 1144 establishes fuel requirements of sulfur content
equal to or less than 0.05% by weight of each shipment of diesel fuel or
biodiesel blend received for use in a generator on or after April 11,
2006.  Fuel requirements of gaseous fuels for waste, landfill, or
digester gases, combusted in a generator on or after April 11, 2006 will
contain no more than ten grains total sulfur per 100 dry standard cubic
feet (170 ppmv total sulfur) on a daily average.  An alternative total
sulfur limit for waste, landfill, or digester gases shall be allowed
based upon a case-by-case determination. 

Regulation No. 1144 establishes recordkeeping and reporting requirements
and maintaining each record for a minimum of five years after the date
the record is made.  

Regulation No. 1144 requires stationary generators that operate at times
other than during emergencies for testing or for maintenance to meet
certain emission standards to reduce their emissions.

C.  EPA EVALUATION:

With the provisions of Regulation No. 1144, the air emissions from new
and existing stationary generators in the State of Delaware will not
cause or contribute to the existing air quality problems with regard to
ground-level ozone and particulate matter, thereby adversely impacting
public health, safety and welfare. 

D.  CONCLUSIONS AND RECOMMENDED AGENCY ACTION:

Regulation No. 1144 adopted by the State of Delaware will result in the
control of NOx, NMHC, PM, SO2, CO, and CO2 emissions from stationary
generators and will help the State in attaining compliance with the
8-hour ozone NAAQS.  EPA approval of the SIP revision is recommended.

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