Minnesota Power and the Duluth Port said they will reach a milestone this weekend when the 15th ship bearing wind generation equipment destined for Minnesota Power’s growing renewable energy installation in North Dakota sails into the harbor beneath the Aerial Lift Bridge. The BBC cargo ship, Peter Roenna is expected to arrive in Duluth late Sunday night carrying more than two dozen renewable wind energy components after a voyage from Brande, Denmark, where the equipment is manufactured by Siemens A.G.