ghg-inventory-1990-2013

Source-specific QA/QC and verification
In the preparation of this Inventory, the Fuel combustion category underwent Tier 1
quality-assurance and quality-control checks as recommended in table 8.1 of Good
Practice Guidance and Uncertainty Management in National Greenhouse Gas
Inventories (IPCC, 2000). These include regular control sums throughout systems to
verify system integrity, and consistency checks on implied emission factors.
Source-specific recalculations
As discussed in section 3.3.2, emission factors for solid fuels were updated for the
previous submission in response to a 2013 ERT recommendation. This resulted in
changes in emissions from solid fuel combustion across all sectors, including Public
electricity and heat production. In addition, the previous submission implemented
updated emission factors for solid fuel combustion for electricity generation to include
the effect of imported coal use reported by the operator of the country’s only primary
producer of coal-fired electricity generation.
The net effect was a decrease in CO 2 emissions in the Public electricity and heat
production sector across the time series. A full time series of the emission factor for subbituminous
coal used for electricity generation can be found in annex 4 (table A4.2).
3.3.7 Fuel combustion: Manufacturing industries and
construction (CRF 1A2)
Description
This category comprises emissions from fossil fuels combusted in iron and steel, other
non-ferrous metals, chemicals, pulp, paper and print, food processing, beverages and
tobacco, and other uses. Emissions from co-generation plants that do not meet the
definition of co-generation as provided in the IPCC guidelines (IPCC, 2006) are included
in this category.
In 2013, emissions from 1.AA.2 Manufacturing industries and construction subcategory
accounted for 5,959 kt CO2-e (19 per cent) emissions from the Energy sector. Emissions
were 1,201 kt CO2-e (25 per cent) above the 1990 level of 4,758 kt CO2-e. A decline
in methanol production in 2003–04 caused a significant reduction in emissions from this
category. Methanol production is the largest source of emissions in subcategory
1.AA.2.C Chemicals.
Changes in emissions between 2012 and 2013
Between 2012 and 2013, emissions from the manufacturing industries and construction
sector increased by 600 kt CO2-e (11 per cent). This is primarily due to a 255 kt CO2-e
(14 per cent) increase in emissions from solid fuels in the sector as a result of the
increased economic activity.
Key categories identified in the 2013-level assessment from the manufacturing industries
and construction category include CO 2 emissions from:
Chemicals – Gaseous Fuels
Food Processing, Beverages and Tobacco – Gaseous Fuels
Food Processing, Beverages and Tobacco – Liquid Fuels
Food Processing, Beverages and Tobacco – Solid Fuels
Other – Mining and Construction – Liquid Fuels
Other – Non-metallic Minerals – Solid Fuels
New Zealand’s Greenhouse Gas Inventory 1990–2013 63