I'm not sure if WA actually reserves the full 15% or if it reserves what it needs up to 15% and allows the rest to be exported.
I did read WA is planning a major increase in gas exports, despite environmental protests.
I suppose with most gas nationally locked up in long-term export contracts, it may not be a simple matter for the federal government to just apply a blanket reserve policy, as existing gas may already be contracted.
Maybe the answer is to apply a reserve rule to the proposed Beetalo field in the NT and pipe some to the East Coast, but that would require some new pipeline sections.
I also read the existing pipeline carrying Qld gas to NSW and Vic is at capacity, with the largest demand being from Vic.

