PNM power lines cross a segment of Bureau of Land Management land. (Aaron Wilson/Albuquerque Journal) ALBUQUERQUE, N.M. — A coalition of environmental and consumer advocacy groups signed on Friday to an agreement to support the proposed merger between Public Service Co. of New Mexico and Connecticut-based energy giant Avangrid. PNM and Avangrid filed an “initial stipulation” agreement last Tuesday with the state Public Regulation Commission that committed the Attorney General’s Office and six environmental and indigenous community groups to support the merger in public hearings at the PRC, scheduled for early May. In that initial agreement, the companies added a lot more public benefits to its merger proposal to win broader community support, after many organizations participating in the case criticized the original deal for minimizing rate relief and other assistance for PNM customers and local communities.