Both vessels – costing €100m ($137m) each – were delivered last year from Daewoo shipyard in South Korea, and are among the few jack-up barges in operation capable of lifting 6MW turbines.

The move comes amid a significant belt-tightening programme at Germany's RWE, whose pain is being shared by Innogy, its renewables division. RWE, like many European utilities, faces huge financial challenges amid a fast-changing EU power market.

Innogy