Ontario’s Environment Minister has cancelled a $200-million wind farm south of Ottawa — one almost fully constructed — because the giant turbines pose a threat to nearby bat populations.

In a Dec. 4 letter, Minister Jeff Yurek said he’s revoking the approval given to the Nation Rise Wind Farm, which has already erected a number of the 29 planned turbines in a rural area near the villages of Crysler and Finch in the Township of North Stormont.

The surprising decision comes about seven months after construction began on the 100-megawatt project, proposed by EDP Renewables, a subsidiary of a multinational with North American headquarters in Texas.

Yurek wrote to Margaret Benke, an…