[The Boston Globe – Editorial] As part of electricity deregulation in the 1990s, Massachusetts passed a law requiring utilities to get more of their power from renewable sources. Lawmakers had in mind new wind turbines, solar power, or other innovative sources of electricity that did not deplete the planet’s dwindling supply of fossil fuels or contribute to global warming. The legislators were not thinking of including existing generators that burn wood or sawmill waste, called biomass generically. But that is precisely what a bill passed this week by the Legislature would do. Governor Romney should veto the measure.