As a result, some of Infratil's subsidiaries "may have a retention value lower than the price a private market buyer is willing to pay", while some publicly listed assets appeared "very cheap."
"The situation continues to be reviewed," he said.
"It can be possible to buy assets at well below fair value and strained government finances will increase the need for privately funded energy and transport infrastructure."
Ebitdaf in the latest period was up 7 per cent to $272.9 million, with solid performances from TrustPower and NZ Bus, a "satisfactory" first half for Z Energy, and reduced earnings as expected from Infratil Energy Australia.
Ebitdaf for TrustPower came in at $161.6 million ($147.7 million in the prior comparable period), NZ Bus was up 16 per cent on the same basis at $24 million, Wellington Airport showed flat operating earnings at $35.7 million, and Infratil Australia had ebitdaf of $46.2 million, compared with $61.2 million in the same period a year earlier.
Dissatisfaction with the market price of Infratil shares also saw Infratil buy back 1.5 per cent of the equity on issue during the period, while "a major US funds management firm who are an experienced investor in the New Zealand market" bought around 2.5 per cent, as did Infratil management.