Despite Pattern having more than doubled the size of its wind fleet since its September 2013 IPO, its shares currently trade at almost exactly their $22 IPO price, having fallen steadily from a high of $33.70 last summer – and having plunged by nearly 25% in the last month.

Pattern Energy, the New York-listed yieldco of parent Pattern Development, is far from the only renewables yieldco to have seen its shares suffer of late.