"These investments provide the source of future income and value growth. Each of last year's new investments, Canberra Data Centres, Longroad Energy and ANU Student Accommodation, performed above expectations" while its investments in Wellington Airport and Trustpower investments delivered record results, it said.
The company spent $325.9m on its investments over the past year, down from $728.2m the previous year and "a little less than hoped for" as a couple of investment plans took longer than expected to execute. It highlighted that it has $533m of funds available for potential future investment.
Over the past year, the company provided additional capital to RetireAustralia to enable a doubling of its rate of development, and Tilt Renewables started construction of a wind farm in Victoria and contracted the electricity output, it said.
"Looking forward, it is anticipated that earnings will rise materially over the next few years as recent investments lift their earnings contributions," the company said.
Infratil will pay a final dividend of 10.75 cents a share on June 18, bringing the full-year dividend to 16.75 cents, up from 15.75 cents last year.
"Capital structure and confidence in outlook are positive for continued growth in dividends per share, with potential for higher dividend as Longroad development gains are realised," it said.
Its 2018 net profit fell to $60.5m from $66.1m in 2017 due to higher depreciation, tax and minorities, partially offset by lower interest costs.
Its shares advanced 0.8 per cent to $3.24 in early trading today. The stock has shed 3.2 per cent so far this year.