Dec 17 (Reuters) - Spark Infrastructure Group SKI.AX :
* NOTES RELEASE OF 2018 RATE OF RETURN (ROR) INSTRUMENT AND FINAL REPORT ON REVIEW OF REGULATORY TAX APPROACH BY AER
* 2018 ROR INSTRUMENT WILL APPLY TO ALL FUTURE REGULATORY REVENUE DETERMINATIONS TO BE MADE BY AER OVER NEXT 4 YEARS
* CO'S REGULATED NETWORK BUSINESSES HAVE CERTAINTY OF CASH FLOWS IN SHORT TERM FROM EXISTING REGULATORY DETERMINATIONS