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Carbon footprints or LCAs of buildings are data intensive.  This section provides data that have been compiled by BRANZ to support carbon footprinting and LCAs of buildings, which comprise:

  • Datasheets - generic, scenario-based data to support modelling decisions for specific stages of the building life cycle.
  • Materials data - BRANZ CO2NSTRUCT contains embodied greenhouse gas and embodied energy data for construction materials and products.
  • New Zealand Grid electricity - contains calculated potential enviromental impacts as a result of possible future scenarios published by MBIE (2016).  These have been calculated based on an LCA model of New Zealand low voltage Grid electricity developed by Sacayon Madrigal (2015).

BRANZ welcomes data from industry providers that will add to and/or improve the data presented here.  To find out how to do this, please click here.

Datasheets (activity/scenario data)

Datasheet data are generic i.e. they do not relate to specific building products, and therefore are aimed for use in early design when decisions on specific products are less likely to be made.

The data are presented in Excel. Each datasheet has a worksheet that provides guidance on the structure of the datasheet, and how to use the presented information. BRANZ recommends that you read this prior to use.

Datasheets may be useful for other LCA applications. It is up to the user to determine the suitability of the data for these other purposes.

Available datasheets are:

The methods used for development of these datasheets are set out in the BRANZ SR351 study report. 

Construction materials embodied environmental impacts

BRANZ CO2NSTRUCT is a source of data containing embodied greenhouse gas and embodied energy data for construction materials and products. The data in BRANZ CO2NSTRUCT are derived from several sources which are provided in the database. All data are additionally provided with a data quality metric.

Care should be taken when basing decisions on data for embodied environmental impacts only, as this does not consider the full life cycle.

New Zealand Grid electricity environmental impacts

MBIE (2016) provides five future scenarios for New Zealand Grid electricity from now to 2050. These are based on assumptions about GDP and population growth, and prices of carbon and renewable technology.

Using an LCA model of the New Zealand Grid developed by Sacayon Madrigal (2015), these five scenarios have been evaluated, with the results available below:

The LCA model includes aspects such as pre-combustion processes for fossil fuels (exploration, extraction, transport, processing), and infrastructure.

References cited in this section

MBIE; Electricity demand and generation scenarios - scenario and results summary (2016)
Sacayon Madrigal EE (2015); Assessment of the life cycle-based environmental impacts of New Zealand electricity; Master's thesis presented to Massey University.