Market speculation has linked Shell's renewables arm to a possible bid for Vestas, the Danish firm that is the world's largest manufacturer of wind turbines.

Rumors in the City of London linked oil giant Shell with a possible GBP2 billion approach for Vestas, although Shell refused to comment on the speculation.

The move is being seen as indicative of growing interest in the green generation sector, and any successful buyout would mark a significant scaling up of Shell’s green investment. Currently Shell has spent a relatively modest GBP1 billion on alternative energy, the Guardian newspaper has reported.

This is not the first time that Copenhagen-based Vestas has been linked to a takeover – the likes of ABB and Caterpillar are also touted as potential bidders should the group come up for sale.