Former Bord na Mona boss-turned-green evangelist O'Connor made €48m when selling renewable energy firm Airtricity for €1.2bn in 2007. He ploughed most of it into setting up Mainstream Renewable. Power valuations got pretty toppy, with the group thought to be worth close to €800m at one stage. But investors have gone very cold on the sector. Japanese trading house Marubeni spent €100m for a 25pc stake three years ago, valuing the business at €400m.
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