Then 18 Siemens 2.3MW turbines loom into view, blades arcing through the air against a backdrop of distant pine forests.

Switch-on of Fred Olsen Renewables’ latest Scottish wind farm, the 41.4MW Rothes 2, marks the start of operations at one of many developments on the fast track to get power flowing ahead of the UK government’s 10% reduction in its Renewables Obligation Certificate (ROC) subsidy — the so-called “rush to ROCs”.

Rothes