Legislative, including: Renewable Energy (Electricity) (Large-scale Generation Shortfall Charge) Act 2000, Renewable Energy (Electricity) Amendment Act 2010 and Renewable Energy (Electricity) (Small-scale Technology Shortfall Charge) Act 2010.
"Under the Act, wholesale purchasers of electricity (the ‘liable entities’) are required to meet a share of the LRET (Large Renewable Energy Technology) and SRES (Small Renewable Energy Sources) in proportion to their share of the national wholesale electricity market. The Act provides for the creation of large-scale generation certificates (LGCs) from accredited renewable energy power stations and the creation of small-scale technology certificates (STCs) from eligible solar water heaters and small generation unit installations."
The LGC share for 2016 is 12.75 per cent. "The STP for 2016 is 9.68 per cent." (Source: https://www.legislation.gov.au/Details/F2016L00313/Explanatory%20Statement/Text)
The rate of charge as of 2010 was $65 per MWh. (Source: https://www.legislation.gov.au/Details/C2010A00071)
"Under the Renewable Energy Target, liable entities (usually electricity retailers) are classified as an individual or company who is the first person to acquire electricity in a grid which has an installed capacity of 100 MW or more." (Source: http://www.cleanenergyregulator.gov.au/RET/Scheme-participants-and-industry/Renewable-Energy-Target-liable-entities)