SunEdison's TerraForm Power opts for poison pill to fend off Brookfield

Last month, Toronto-based Brookfield announced it had acquired 11.1 million of TerraForm Power's non-controlling Class A shares — equivalent to a 12% stake — making it the yieldco's largest shareholder.

Brookfield also has swap agreements in place that would allow it to buy a further 11.6 million Class A shares.

SunEdison, which is in the early stages of Chapter 11 bankruptcy, owns the controlling Class B shares of TerraForm Power and its sister yieldco, TerraForm Global.

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