Greentech acquired 85% of the 48.3MW Sicily-based wind farm developed by Nicastri in 2007, and the remaining 15% in May.
The Italian police's anti-Mafia agency, the DIA, has confiscated a 15% stake in the farm as part of an investigation into whether the Mafia is "going green" by laundering money through alternative-energy companies.
General Antonio Girone, head of the DIA, says Nicastri is linked to Matteo Messina Denaro, believed to be the Mafia's "boss of bosses."
