Last autumn Pattern Energy Group LP, owned by Riverstone Holdings, raised $352m by splitting itself in two and listing most of its operational wind assets in a new company on the Nasdaq and Toronto Stock Exchange, in one of the most prominent and successful yieldco IPOs of 2013.

In December the new yieldco – Pattern Energy – made its first acquisitions, paying its parent company $202m for stakes in two wind projects slated for completion later this year, lifting its portfolio to 1.26GW.

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