Philippines-controlled UAC Energy has increased its stake in Infigen Energy to 20 per cent and made it clear it wants to remain a material shareholder, even after ceding the $893 million takeover battle for the wind farm owner to rival Iberdrola.

The increase in UAC's stake, which was flagged by The Australian Financial Review's Street Talk column, rules out the possibility that it would sell its holding to Iberdrola and taking the Spanish player easily over the 50 per cent control threshhold.