It's difficult to overstate how awful Scott Morrison's decision to block State Grid and Cheung Kong Infrastructure from bidding for the NSW government's electricity transmission provider Ausgrid is. It defies logic, evidence and good sense.

Hong Kong company Cheung Kong Infrastructure -- which is privately owned -- has controlling stakes in companies providing power in South Australia and Melbourne. It runs major transmission networks in the UK, Canada and New Zealand as well as Hong Kong and China. Its parent company owns 50% of Vodafone and ports in Sydney and Brisbane. If it's a national security risk, as Morrison claims it is, then we're already screwed.