Vineyard Wind files D&E Agreement that sets forth the terms and conditions under which NSTAR would advance certain design, engineering and cost estimating activities of the civil and below-grade and above-grade electrical substation work at NSTAR’s new proposed Bourne 345 kV substation plus the associated line work and substation upgrades at West Barnstable Station to interconnect two new underground 345 kV lines at West Barnstable Station