Bishop V. Gene Robinson, whose consecration as the first openly gay bishop in the Episcopal Church set off a historic rift in the global Anglican Communion, announced to his New Hampshire diocese on Saturday that he intended to step down.

He plans to retire in January 2013 after nine years as bishop, to give the diocese enough time to elect a new bishop and get the approval of the national church, a process that can take two years.

The news took some by surprise because Bishop Robinson is an energetic 63-year-old, and mandatory retirement age for Episcopal bishops is 72. He has led a relatively stable and healthy diocese, despite predictions by some that his election would undermine the Episcopal Church in New Hampshire.

The reason to depart, he said in a speech delivered at the close of the annual convention of his diocese, is that being at the center of an international uproar has taken a toll on him and on the diocese.