The Greenhouse Gas Reduction Scheme (GGAS) provides for mandatory and elective benchmark participants. Mandatory benchmark participants are all NSW electricity retail suppliers, two electricity generators which supply electricity directly to large customers in NSW and one market customer, which takes electricity supply in NSW directly from the National Electricity Market (known as Class 1, 2, and 3 benchmark participants, respectively). In addition, nine companies which use over 100 GWh of electricity in a year have elected to manage their own benchmarks in 2006. These companies are known as 'elective participants' or class 4 benchmark participants. State significant developments may also elect to be a benchmark participant (class 5 benchmark participant).

Each benchmark participant is responsible for meeting its share of reducing the NSW electricity sector benchmark. Elective participants, having nominated which company sites are part of GGAS, must meet the benchmark reduction targets for those sites.

* As Delta Electricity is both a class 1 and 2 mandatory participant it has only been counted once.

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