Description of Connecticut Air Pollution Control Regulation, Section 22a-174-42
Section 42 will address the potential air quality impacts of DG units through phased-in output-based standards for emissions of oxides of nitrogen, particulate matter, carbon monoxide and carbon dioxide; fuel sulfur content requirements to control emissions of sulfur dioxide; and measures to reduce the regulatory and administrative requirements for the owners and operators of DG units.
The requirements of Section 42 are developed to meet the following goals:
- Encourage the deployment of environmentally sustainable DG units;
- Encourage technological improvements to reduce emissions output from DG units;
- Replace the requirements of the General permit to Construct and/or Operate a New or Existing Phase I Distributed Generation Engine upon expiration of that general permit program on December 31, 2003; and
- Require that DG units meet "NOx SIP call equivalent" emissions standards by 2012
- Section 42 differs from the RAP model rule in one significant respect—Section 42 includes standards and requirements for new and existing generators, while the RAP model only applies to new generators installed after the effective date of section.
Emergency generator means a generator used only during emergencies or for maintenance and testing purposes with maximum annual operating hours that do not exceed 300 hours
per calendar year. Emergency generators do not include generators operated in conjunction with any voluntary demand-reduction program or any other interruptible
power supply arrangement witha utility, other market participant or system operator.
- Limit maximum annual operating hours to 300 hours per calendar year, inclusive of operation or maintenance, testing and emergencies. Hours of operation for maintenance and testing combined shall
not exceed fifty (50) Hours of the 300 hour maximum.
- Neither cause nor allow the emission of carbon dioxide in excess of the applicable standards in the table below.
- For a new emergency generator, comply with the applicable emissions standards of 40 CFR 89 at the time of installation.
Emission Standards for Non-Emergency Generators
| Phase |
NOx Attainment Area (lbs/MWh |
NOx Non-Attainment Area (lbs/MWh) |
CO (lbs/MWh) |
PM* (lbs/MWh) |
CO2 (lbs/MWh) |
| Phase I (Installed on or after January 1, 2004) |
4 |
0.6 |
10 |
0.7 |
1,900 |
| Phase II (Installed after January 1, 2008) |
1.5 |
0.3 |
2 |
0.07 |
1,900 |
| Phase III (Installed after January 1, 2012) |
0.15 |
0.15 |
1 |
0.03 |
1,650 |
* Liquid fuel must meet on-road sulfur standards
* SO2 limit for waste/byproduct fuels
* Emergency generators must meet Federal non-road standards
Maximum Emissions Rates for CHP Systems Replacing Existing Thermal Systems
| Pollutant |
Maximum Emission Rate (lbs/MMBtu) |
| Nitrogen Oxides |
0.3 |
| Particulate Matter |
N/A |
| Carbon Monoxide |
0.08 |
| Carbon Dioxide |
117 |
Credit applied against standard based on displaced emissions:
For new plants, credit equivalent to new gas boiler.
For retrofit, actual displaced emissions up to a cap.