Governor-elect Scott Walker?s order Thursday to axe a biofuels boiler for the redesigned Charter Street Heating Plant was met less with surprise than discouragement by supporters of the plan. “It?s disappointing,” said Jennifer Feyerherm with the Sierra Club. “I think we?re missing a great opportunity to invest in Wisconsin?s future.” In a letter to Daniel Schoof, secretary of the state Department of Administration, Walker said he wants to shift plans to installing a natural gas boiler rather than the boiler that would burn alternative naturally grown fuels such as wood chips or switch grass. Such a move, Walker said, would save the state $100 million of the total $250 million cost of rebuilding the university?s central heating and cooling plant so that it no longer burns coal.