These pages will provide you with general information on Biogas in New Zealand.

To get more detailed and upto date information on Biogas including where to go for advice on developing a biogas resource, a "Who's Who" of Biogas experts in New Zealand and what the current regulations governing biogas use and production are - go to Banz Biogas website.

Recently added on Biogas website

Biogas and IBBK Bioenergy - The International Biogas and Bioenergy Centre of Competence (IBBK) is a combination and network of experts and companies, as well as groups of interest and educational institutes in the field of biogas and bioenergy. read more>...

Events relating to Biogas

The Bioenergy Association has held or plans the following:

"Biogas Workshop on Transport in November 2010"
More details available here

"Biogas from Municipal Organic Waste Workshop "
to be held in conjunction with Energy Management Association of NZ (EMANZ) on
Wednesday, 13th May 2010 in Christchurch.
Click here to view Presentations from the event

"Biogas 2008 - production, use and realising the NZ potential"
Biogas Workshop in Hamilton in July 2008
Details of the event can be found here.

Production of Biogas

Biogas is commonly produced by anaerobic digestion as part of the treatment of wet organic waste.  This occurs in municipal wastewater and sewage treatment plants, industrial operations that have liquid wastes containing organic material, and on types of farms where animals are kept or held in a small area, such as pig or poultry farms.

Biogas is a mixture of mainly methane and carbon dioxide with very small amounts of hydrogen sulphide and other impurities.  The methane content can range from 50% to 80% (on a volumetric basis). 

The high amounts of carbon dioxide in biogas typically reduce the heating value to between 18 and 26 MJ/m 3 (GCV) compared with natural gas typically around 40 MJ/m 3 (GCV).

Sewage treatment plants are methane generators by the nature of the process.  The gas can be used on site to produce electricity for local consumption or exported from the site.  Plants at Christchurch and Auckland are good examples where both methane and natural gas supplies are used in generators at each site.

In many industrial and farming cases treatment of the waste to produce biogas is not economical in itself but is carried out for other reasons such as waste management.  Also, small-scale generation of biogas is rarely economic because of the high labour requirements and dilute nature of the effluent being treated.

Biogas from anaerobic digestion can be used to produce heat for the digestion process itself, or for process heat and electricity in other parts of the plant.  It can be upgraded to “natural gas” quality and fed into a local utility network. It can also be used directly as a fuel in a number of different types of plant such as reciprocating gas engines, mini-gas turbines, Stirling engines, and fuel cells or by direct combustion in boilers or other CHP heat plant.

Anaerobic digestion is a mature technology and is used worldwide, particularly for municipal waste water treatment.  Here the scale of treatment can justify the costs of installing and operating the equipment needed.  If the organic content of wet waste stream is too dilute, recovery of the energy content will be made more expensive.  Excess moisture may cause handling problems for gasification processes.

Anaerobic digestion is essentially a continuous process so it requires a reliable continuous feed of material.

Publications on Biogas Production


Presentations from a Workshop held in 2004 in Christchurch are listed below:

Biogas Interest Group

The Biogas Interest Group lists New Zealand's leading players in the biogas sector including industry technology providers, consultants and researchers.  The Group focuses on the dissemination of information on biogas demonstration projects, sharing information and knowledge about advances in biogas technology and use, and works co-operatively to progress issues such as biogas design and construction standards in large and small scale applications.  Several members are active internationally and are leading their field in the development of innovative biogas technology and solutions.


Biogas Strategy, February 2011
A Banz Biogas Interest Group draft
The NZ Biogas Strategy was developed by the Biogas Committee of BANZ and is a 30-year outline of a potential sector development in this country. The purpose of this document is to assist the New Zealand biogas industry co-ordinate its aspirations and actions. It informs the government and energy sectors about the possible role that biogas can play in the future energy mix of New Zealand. It is a working document intended to be regularly reviewed and updated in the future.
Read more here>>>


If you are a member then use your password to access the member's only area here.

BANZ activities are organised around its Interest Groups. Please contact contact us if you wish to join any of these groups.

Interest Group Meeting Dates

BIG Meeting Timetable for 2013

Keith Jones, University of Auckland - (Convener)

BIG Committee Members (link coming soon)


2.30 pm - Friday, 8 March

2.30 pm - Wednesday, 17 April

2.30 pm - Wednesday, 19 June

2.30 pm - Wednesday, 14 August

2.30 pm - Tuesday, 15 October

2.30 pm - Wednesday, 4 December


  • Download the full list of meeting dates here


Each Interest Group will have at least one Face to Face meeting annually.  Ideally the meeting will coincide with an event.


  • All Board and IG meetings are by GoToMeeting unless otherwise advised)
  • From time to time meeting dates may have to change. The BANZ team will notify members of any changes as soon as possible.

BANZ activities are organised around its Interest Groups. Please contact us if you wish to join any of these groups.

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