Infratil's shares rose 1.3 percent to $4.74 yesterday and have gained about 30 percent so far this year.
While Infratil's current interests include a 51 percent stake in Trustpower, it told the competition regulator that Trustpower - which competes in the residential broadband market - and Vodafone would continue as independent companies.
Yesterday, Commerce Commission chair Anna Rawlings said the regulator was satisfied Infratil's proposed shareholding in both Vodafone and Trustpower would not substantially lessen competition in any of the markets it assessed.
Trustpower is currently Infratil's biggest asset, worth about $1.1 billion, followed closely by Canberra Data Centres at $841-$942 million and Wellington International Airport at $770-850 million.
Infratil's planned purchase of Vodafone will transform its portfolio, with 76 percent of the post-acquisition assets being split equally between renewable energy and data and connectivity. Those two segments account for 48 percent and 22 percent of the portfolio currently.