Powerco has four bonds totalling $330 million listed on the stock exchange's debt market and issued a $100 million wholesale bond in December.
All four securities trade at a premium to their face value, and $130 million of that debt matures in September this year.
The company paid $48.3 million, or 13.1c a share, in the nine-month period, up from $25 million, or 6.8 c a share, in the 2011 financial year.
Powerco is 42 per cent owned by Prime Infrastructure Networks.
Prime Infrastructure, formerly Babcock & Brown, reported a net loss of $11 million in the 2011 calendar year, and has $147.1 million of listed New Zealand debt maturing in November this year.