The final report from the Energy Security Board on the Turnbull government's signature energy policy does not contain detailed modelling the states were awaiting, an absence that could further complicate approval on the plan.

Among the additional details provided by the board to states and territory governments from an initial paper sent a week earlier is the estimate that the share of renewable energy in the National Electricity Market will rise from 17 per cent in 2017-18 to 36 per cent in 2029-30. That outcome, though, is lower than the 46 per cent base case projected by the Australian Energy Market Operator in a separate report released last month.

Australia's energy policy debate is heading to a climax. Credit:Nick Moir

The states and territories, which must provide unanimous support for the National Energy Guarantee for it to proceed, received the extended final detailed design paper by the board on Wednesday.

“Any delay, or worse a failure to reach agreement, will simply prolong the current investment uncertainty and deny customers more affordable energy," Kerry Schott, chair of the board said in a media release. "The average household bill is expected to be $550 lower each year through the 2020s than it is now, and $150 of those savings are because of the guarantee.”