Rhode Island Attorney General Peter Kilmartin is challenging National Grid's effort to deal the state a large electric rate increase.  National Grid's proposed hike would increase the average state resident's power bill by 22-dollars a month.  Kilmartin says families and businesses will be hurt by this increase if it's allowed to stand.  The AG says that he doesn't know how many families would consider a 26-percent rate increase to be in their best interests.