The Warburton Review of Australia's Renewable Energy Target (RET) is expected to be released any day now with speculation emerging last week that the Prime Minister, Tony Abbott is keen to kill off the scheme, or at least lock out new entrants.

But behind the scenes, negotiations have started that could see the RET reinvented as the the Low Emissions Target (LET).

Rather than being limited to principally wind and solar, the expanded scheme could be open to all forms of energy generation - including biomass from the burning of forest and other wastes as well as gas-fired power and even coal.