TORONTO and SPOKANE, WA, Sept. 14, 2017 /PRNewswire/ - Hydro One Limited ("Hydro One") (TSX: H) and Avista Corporation ("Avista") (NYSE: AVA) today filed Applications requesting regulatory approval of the proposed merger of the two companies that was announced on July 19, 2017. The applications have been filed with state utility commissions in Washington, Idaho, Oregon, Montana, and Alaska, as well as with the Federal Energy Regulatory Commission (FERC), requesting approval of the transaction on or before Aug. 14, 2018.