SAN FRANCISCO, California, NEW YORK, New York and MONTRÉAL, Québec, June 19, 2017 – Pattern Energy Group Inc. (NASDAQ and TSX: PEGI) (“Pattern Energy” or the “Company”), Pattern Energy Group LP (“Pattern Development 1.0”), Pattern Energy Group 2 LP (“Pattern Development 2.0” and together with Pattern Development 1.0, “Pattern Development”), Riverstone Holdings LLC (“Riverstone”) and the Public Sector Pension Investment Board (“PSP Investments”) today announced a series of strategic initiatives to significantly increase Pattern Energy’s long-term growth outlook and enhance its access to capital. Collectively, these strategic initiatives position Pattern Energy to capture an increased share of the annual $250 billion global renewable energy market, and support its Pattern 2020 vision to double its portfolio to 5 gigawatts (“GW”) by 2020. All references herein to “$” or dollars are to U.S. dollars.