Aug 28 (Reuters) - Spark Infrastructure Group SKI.AX
* HY net profit after tax up 2.9% to $48.9 million
* Directors have determined that distribution reinvestment plan will remain suspended
* HY total income $150.196 million versus $138.659 million a year ago
* Reaffirmed distribution guidance for 2017 and 2018, subject to business conditions, of 15.25 cps and 16.0 cps
* Interim distribution declared of 7.625 cents per security