Wellington Region Greenhouse Gas Inventory

This page describes the Wellington Region Greenhouse Gas Inventory released on 10 April 2014 by the six Wellington Region commissioning Councils.

What is the Wellington region greenhouse gas inventory?

The Wellington region greenhouse gas (GHG) inventory presents an annual accounting of GHG emissions for the Wellington region as a whole with a breakdown by district for the financial years 2000/01– 2012/13.  The districts include Wellington City, Porirua City, Kāpiti Coast District, Hutt City and Upper Hutt City as well as South Wairarapa District, Carterton District and Masterton District (note that emissions from the latter three districts are reported in aggregate).

The inventory includes emissions and removals from the following sectors:  stationary energy, transport, industrial processes, forestry, agriculture and waste.  It covers the following six greenhouse gases: carbon dioxide (CO2), methane (CH4), nitrous oxide (N¬2O), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs) and sulphur hexafluoride (SF6). 

Why was the inventory commissioned and who prepared it?

This inventory was commissioned to improve understanding of regional emission sources and trends and inform policy making and action to reduce emissions by government, businesses and households.  The consultancy URS New Zealand Limited was commissioned to prepare the study by a consortium of six councils:  Wellington City Council, Porirua City Council, Kāpiti Coast District Council, Hutt City Council, Upper Hutt Council and Greater Wellington Regional Council.  South Wairarapa District Council, Carterton District Council and Masterton District Council assisted with data collection and review.  

How do the results from the Wellington region compare to those in the national greenhouse gas inventory?

The inventory results for the Wellington region cannot be compared directly to those in New Zealand’s national inventory on either an absolute or per capita basis. 

However, there is still some value in comparing relative emission profiles and trends.  The emission profile of the Wellington region diverges somewhat from the national profile, since the region has relatively less industrial and agricultural production and different levels of forestry activity.  The differences are more evident in the more urbanised districts.

The nearly 3 percent decline in regional gross emissions and stable trend in regional net emissions over the period 2000/01 to 2012/13 contrasts with the increasing trend in national emissions.  Nationally, gross emissions increased by 5 percent and net emissions increased by 30 percent from 2000 to 2011, the most recent year for which national data are available.