X0306 4 2017-04-27 0 0001578685 Midcoast Energy Partners, L.P. MEP 0001218297 ENBRIDGE ENERGY CO INC 1100 LOUISIANA, SUITE 3300 HOUSTON TX 77002 1 0 1 0 Class A Common Units representing limited partner interests 2017-04-27 4 A 0 21275000 8.00 A 21275000 D Class A Common Units representing limited partner interests 1335056 I By Enbridge Energy Partners, L.P. Pursuant to the Agreement and Plan of Merger, dated as of January 26, 2017, by and among the issuer, Midcoast Holdings, L.L.C., Enbridge Holdings (Leather) L.L.C., and the reporting person (the "Merger Agreement"), Enbridge Holdings (Leather) L.L.C., a wholly owned subsidiary of the reporting person, merged with and into the issuer, with the issuer surviving the merger (the "Merger"). The securities reported as acquired herein represent all Class A Common Units representing limited partner interests in the issuer (each, a "Class A Common Unit") issued and outstanding immediately prior to the effective time of the Merger (the "Effective Time"), other than Class A Common Units held by the reporting person, Enbridge Energy Partners, L.P. and their respective affiliates, which were converted in the Merger into the right to receive $8.00 in cash without interest. /s/ Mark A. Maki, President of Enbridge Energy Company, Inc. 2017-05-01