6. Unique emissions factors
6.1 Overview
An opt-in natural gas participant may apply for a unique emissions factor (UEF) for the N2O and CH4 emissions from use of the gas in particular combustion equipment. The periodic source testing option must be followed to measure the concentration of nitrous oxide and methane and physical properties of stack gases, and to calculate a UEF. There are no other UEF options for natural gas.
6.2 Applications
The UEF must be based on the sampling, testing and calculation methods set out in regulation, the results of which must be independently verified.
An application for approval of a UEF must:
- describe the class of natural gas and the particular combustion equipment covered by the UEF, with well-defined parameters so that the fuel may be easily identified and accounted for separately from fuel that is not within the class
- be accompanied by a verifier’s statement and a plan for ongoing testing
- be submitted to the Chief Executive of the Ministry for Economic Development by 31 January in the year following the first year to which the UEF relates.
6.3 Verification
The sampling, testing and calculations undertaken to develop a UEF must be independently verified. A recognised verifier must review the records provided by the applicant and assess these against the process outlined in the regulations to establish and calculate the UEF. A list of recognised verifiers will be posted at www.eur.govt.nz.
6.4 Use of a unique emissions factor
Details of approved unique emissions factors, including the name of the participant and any conditions of approval, will be published in the New Zealand Gazette.
If approved by the Chief Executive of the Ministry of Economic Development, a unique emissions factor may be used until:
- there is a material change in any of the information or factors on which the Chief Executive’s approval was based, or the relevant legislation, or
- any conditions to which the approval is subject cease to be met or complied with.
To help determine when a material change might occur, participants are required to submit a plan for ongoing sampling and testing with their application. The Chief Executive may also grant approval subject to any conditions considered appropriate. This could, for example, include a requirement to submit the results of ongoing testing at a later date.
